JP2021095885A - Lubrication device for internal combustion engine - Google Patents

Abstract

To provide a lubrication device for an internal combustion engine for enabling appropriate adjustment of an oil temperature.SOLUTION: A lubrication device for the internal combustion engine includes an adjustment mechanism for allowing lubricating oil to branch and flow into an exhaust port side return oil path provided on the exhaust port side and an intake port side return oil path provided on the intake port side to supply it to an oil pan after supplied to each site of the internal combustion engine, while reducing the amount of the lubricating oil to flow to the exhaust port return oil path when an index value correlative to the temperature of the oil is high, than when it is low.SELECTED DRAWING: Figure 1

Description

The present invention relates to a lubricator for an internal combustion engine.

Generally, in an internal combustion engine, lubricating oil lubricates the inside, and the lubricating oil stored in the oil pan is sucked out by an oil pump, and the lubricating oil is used as a lubricating oil supply target member (for example,) of each part of the internal combustion engine. , Cylinder, piston, etc.), and is used for lubrication by the member to be supplied with lubricating oil, and absorbs heat such as frictional heat from the member to be supplied with lubricating oil. Returning to bread.

For example, in Patent Document 1, after being discharged by a pump and supplied to a member (camshaft, etc.) to be supplied with lubricating oil, it branches into an exhaust port side return oil passage and an intake port side return oil passage to an oil pan. An oil return structure for an internal combustion engine with a return configuration is disclosed.

Japanese Unexamined Patent Publication No. 2008-75472

The oil return structure of the internal combustion engine described in Patent Document 1 described above is composed of a plurality of return oil passages.

However, when the lubricating oil has a low temperature, for example, at the time of cold start, the frictional resistance of the sliding member increases due to the high viscosity of the lubricating oil, and the fuel consumption deteriorates. Further, when the internal combustion engine is operated with a high load and the lubricating oil becomes high in temperature, the lubricating oil may be thermally deteriorated.

The present invention has been made in view of the above, and an object of the present invention is to provide a lubrication device for an internal combustion engine capable of appropriately adjusting the oil temperature.

The lubrication device for an internal combustion engine according to the present invention is provided on the exhaust port side return oil passage provided on the exhaust port side and on the intake port side for supplying to the oil pan after being supplied to each part of the internal combustion engine. In an internal combustion engine lubricator in which lubricating oil flows by branching to an intake port side return oil passage, when the index value correlated with the temperature of the lubricating oil is high, the exhaust port side return oil passage is compared with when it is low. It is characterized by being provided with an adjusting mechanism for reducing the amount of oil flowing through the engine.

Further, the index value may be the temperature of the lubricating oil or the cooling water temperature of the internal combustion engine.

Further, the adjusting mechanism may reduce the amount of oil flowing into the exhaust port side return oil passage when the index value is equal to or higher than the first threshold value.

Further, the adjusting mechanism may increase the amount of oil flowing in the exhaust port side return oil passage when the index value is less than the second threshold value lower than the first threshold value.

Further, the adjusting mechanism may be a hydraulic valve or a solenoid valve.

According to the present invention, when the index value correlated with the oil temperature is high, the oil temperature is appropriately adjusted by providing an adjustment mechanism for reducing the amount of oil in the return oil passage on the exhaust port side as compared with when the index value is low. Can be done.

FIG. 1 is a configuration diagram showing an example of a lubricating oil circulation system according to the present invention. FIG. 2 is a perspective perspective view showing an oil passage on the exhaust port side formed in the internal combustion engine according to the first embodiment of the present invention. FIG. 3 is a schematic cross-sectional view of the control valve according to the first embodiment of the present invention. FIG. 4 is a cross-sectional view of the fuel engine according to the first embodiment of the present invention. FIG. 5 is a block diagram of a lubrication device for an internal combustion engine according to the first embodiment of the present invention. FIG. 6 is a control flowchart executed by the lubricator of the internal combustion engine according to the first embodiment of the present invention. FIG. 7 is a control flowchart executed by the lubricator of the internal combustion engine according to the modified example of the present invention. FIG. 8 is a schematic cross-sectional view of the internal combustion engine according to the second embodiment of the present invention. FIG. 9 is a block diagram of a lubrication device for an internal combustion engine according to a second embodiment of the present invention. FIG. 10 is a control flowchart executed by the lubricator of the internal combustion engine according to the second embodiment of the present invention.

Hereinafter, embodiments for carrying out the present invention (hereinafter, referred to as “embodiments”) will be described with reference to the accompanying drawings.

(Embodiment 1)
First, the lubricating oil circulation system in the internal combustion engine of the present invention will be described with reference to FIG. FIG. 1 is a configuration diagram showing an example of a lubricating oil circulation system according to the present invention. The internal combustion engine 1 circulates in the internal combustion engine 1 an engine block 4 in which various lubricated mechanisms such as a piston 17, a crankshaft 18, and a camshaft 19 are arranged, and lubricating oil for lubricating the various lubricated mechanisms. It is provided with a lubrication system 3 for making the engine.

The engine block 4 is provided with various lubricating oil supply target members such as a piston 17, a crankshaft 18, and a camshaft 19. At the lower end of the engine block 4, an oil pan 2 for storing oil to be supplied to these members to be supplied with lubricating oil is arranged.

The lubricating system 3 is configured as follows so that the lubricating oil stored in the oil pan 2 can be supplied to the various members to be supplied with the lubricating oil.

An oil strainer 31 is arranged in the oil pan 2. The oil strainer 31 removes foreign matter and the like in the lubricating oil, has a suction port 31a for sucking the lubricating oil stored in the oil pan 2, and has an engine block via the strainer flow path 31b. It is connected to the oil pump 32 provided in 4.

The oil pump 32 is a pump that sucks up the lubricating oil stored in the oil pan 2, and supplies the lubricating oil to the members to be supplied with the lubricating oil via the oil filter 33. For example, it is composed of a rotary pump and the like. Further, the rotor of the oil pump 32 is engaged with the crankshaft 18 so as to rotate with the rotation of the crankshaft 18. Further, the oil pump 32 is connected to the oil inlet of the oil filter 33 provided outside the engine block 4 via the oil transport pipe 34. The oil outlet of the oil filter 33 is connected to an oil supply pipe 35 provided as an oil passage leading to the various lubricating oil supply target members described above.

When the operation of the internal combustion engine 1 is started, the oil pump 32 is driven as the crankshaft 18 rotates. Then, as shown by an arrow V in FIG. 1, the oil pump 32 sucks the lubricating oil stored in the oil pan 2 from the suction port 31a of the oil strainer 31, and sucks the sucked lubricating oil into the oil transport pipe 34. , The oil filter 33 and the oil supply pipes 35, 36, 37, 38 are sequentially passed through, and the oil is supplied to the lubricating oil supply target member which is the lubrication target in the engine block 4. The lubricating oil supplied to the member to be supplied with the lubricating oil in this way functions as the lubricating oil in the member to be supplied with the lubricating oil, and after absorbing heat such as frictional heat generated during the operation of the member to be supplied with the lubricating oil, It flows down by gravity and is collected in the oil pan 2.

Next, the oil passage formed in the engine block 4 will be described with reference to FIG. FIG. 2 is a perspective perspective view showing a return oil passage on the exhaust port side formed in the internal combustion engine according to the first embodiment of the present invention.

The engine block 4 is composed of a cylinder block 40 and a cylinder head 41, and an exhaust port side return oil passage 11 is provided from the cylinder block 40 to the cylinder head 41. The exhaust port side return oil passage 11 includes a cylinder head return oil passage 11a and a cylinder block return oil passage 11b. The return oil passage 11 on the exhaust port side is a return for allowing the lubricating oil supplied to the members to be supplied with the lubricating oil such as the intake valve, the exhaust valve, and the camshaft arranged in the cylinder head 41 to flow down to the oil pan 2. It is an oil passage. A plurality of cylinder head return oil passages 11a are provided on the exhaust port side of the cylinder head 41, and are oil passages through which lubricating oil flows down to the cylinder block return oil passage 11b of the cylinder block 40 via the cylinder head 41.

The cylinder block return oil passage 11b is provided close to the water jacket 21 on the exhaust port side, and the lubricating oil flowing down from the cylinder head return oil passage 11a is provided up to the oil pan 2 arranged at the lower end of the cylinder block 40. It is a return oil channel that allows the oil to flow down. The cylinder block return oil passage 11b is provided with a collecting portion 11c that collects the lubricating oil that has flowed from the plurality of cylinder head return oil passages 11a. Further, the aggregation unit 11c is provided with a first control valve 110 as an adjusting mechanism capable of adjusting the amount of flowing oil, and the first control valve 110 is, for example, an electromagnetic valve. Although the return oil passage on the exhaust port side has been described in FIG. 2, the intake port side is also provided with a return oil passage having the same configuration, and the return oil passage on the intake port side is provided with a control valve. Not done.

FIG. 3 is a schematic cross-sectional view of the control valve according to the first embodiment of the present invention. FIG. 3A shows a normal state of the first control valve 110. On the other hand, FIG. 3B shows a state in which the first control valve 110 is controlled to the open side, and the amount of lubricating oil flowing through the exhaust port side return oil passage 11 is larger than in the normal state. Is. Further, FIG. 3C shows a state in which the first control valve 110 is controlled to the closed side, and the lubricating oil does not flow.

The first control valve 110 includes a valve body 111, a storage portion 112, and a valve seat 113. The storage unit 112 is provided with a recess for storing the valve body 111, and the valve body 111 is stored in the storage unit 112 by not generating an electromagnetic force from an electromagnetic force generator (not shown) that generates an electromagnetic force. .. The valve seat 113 is provided at a position facing the recess of the accommodating portion 112, and the valve seat 113 is provided with a recess with which a part of the valve body 111 comes into contact when a predetermined electromagnetic force is generated from the electromagnetic force generator. ing. Further, the amount of the valve body 111 pushed out from the storage portion 112 can be adjusted by adjusting the strength of the electromagnetic force, and the amount of oil can be adjusted by changing the opening area of the first control valve 110. The first control valve 110 may be a hydraulic valve or the like, and is not limited to these as long as the amount of oil can be adjusted.

FIG. 4 is a cross-sectional view of the internal combustion engine according to the first embodiment of the present invention. As shown in FIG. 4, cylinders 22 (four in the present embodiment) are provided in the cylinder block 40. A piston 17 that reciprocates in the vertical direction in FIG. 4 is provided in the cylinder 22. Each piston 17 is connected to the crankshaft 18 via a connecting rod 23. The crankshaft 18 is arranged in a space partitioned by the crankcase 24 and the oil pan 2.

Further, in the internal combustion engine 1, the combustion chamber is partitioned by the peripheral wall of each cylinder 22, the piston 17, and the cylinder head 41. In the combustion chamber, an air-fuel mixture containing intake air introduced into the combustion chamber via the intake passage 26 and fuel injected from the fuel injection valve is burned. The exhaust gas generated in the combustion chamber by the combustion of such an air-fuel mixture is discharged to the exhaust passage 27.

The intake valve 28 opens and closes the combustion chamber of the intake passage 26, and the exhaust valve 29 opens and closes the combustion chamber of the exhaust passage 27. The intake valve 28 operates in synchronization with the rotation of the camshaft 19 for the intake valve 28. Further, the exhaust valve 29 operates in synchronization with the rotation of the camshaft 20 for the exhaust valve 29.

As shown in FIG. 4, a water jacket 21 which is a cooling water passage through which cooling water flows is provided in the cylinder block 40 and the cylinder head 41 so as to surround the cylinder 22.

Further, the cylinder head 41 has an exhaust port side return oil passage 11 (11a, 11b) that flows separately to the exhaust port side and the intake port side after the lubricating oil is supplied to a member to be supplied with the lubricating oil such as a camshaft. The intake port side return oil passages 12 (12a, 12b) are provided. A first control valve 110 is provided in the return oil passage 11 on the exhaust port side. The alternate long and short dash line in FIG. 4 shows the flow of lubricating oil flowing through the return oil passage 11 on the exhaust port side, and the broken line shows the flow of lubricating oil flowing through the return oil passage 12 on the intake port side.

FIG. 5 is a block diagram of a lubrication device for an internal combustion engine according to the first embodiment of the present invention. The lubrication device 200 includes an internal combustion engine 1 and an ECU 13. The internal combustion engine 1 includes an oil temperature sensor 100, an exhaust port side return oil passage 11, an intake port side return oil passage 12, and a first control valve 110.

The oil temperature sensor 100 is connected to the ECU 13 via electrical wiring, detects the temperature of the lubricating oil that lubricates the inside of the internal combustion engine 1, and transmits the detected oil temperature to the ECU 13.

The exhaust port side return oil passage 11 is provided with a first control valve 110, and the first control valve 110 is connected to the control unit 15 via electrical wiring.

The ECU 13 includes a storage unit 14 and a control unit 15, and is connected to the oil temperature sensor 100 via electrical wiring. The storage unit 14 is provided with a volatile memory such as a RAM (Random Access Memory) and a non-volatile memory such as a ROM (Read Only Memory). Further, the storage unit 14 has a first threshold value T1 defined as a temperature at which the lubricating oil begins to thermally deteriorate when the lubricating oil becomes high in temperature, and the viscosity becomes high when the lubricating oil becomes low in temperature, so that the friction of the sliding member is increased. The second threshold value T2, which is set as the temperature at which the fuel efficiency starts to deteriorate as the resistance increases, is stored. Further, the first threshold value T1 is a temperature higher than the second threshold value T2.

The control unit 15 is connected to the first control valve 110 via electrical wiring, and the control unit 15 controls the first control valve 110 based on the oil temperature acquired from the oil temperature sensor 100. The specific control method will be described later.

FIG. 6 is a control flowchart executed by the lubricator of the internal combustion engine according to the first embodiment of the present invention. First, in step S101, the control unit 15 acquires the oil temperature T detected by the oil temperature sensor 100, and the control unit 15 determines whether or not the oil temperature T is equal to or higher than the first threshold value T1 (step S102). ..

When the control unit 15 determines in step S102 that "the temperature T of the lubricating oil is T1 or higher" (step S102: Yes), the control unit 15 returns the exhaust port side by controlling the first control valve 110 to the closed side. The amount of oil flowing through the oil passage 11 is reduced (step S103), and the lubricator 200 ends the control flow. When the control unit 15 determines that the temperature T of the lubricating oil is less than T1 (step S102: No), it is determined that the lubricating oil does not thermally deteriorate, and the lubricating device 200 ends the control flow.

As described above, according to the first embodiment, when the oil temperature is equal to or higher than the first threshold value T1, the first control valve 110 is controlled to the closed side to reduce the amount of oil flowing through the exhaust port side return oil passage 11. Therefore, the rise in oil temperature can be suppressed, and the thermal deterioration of the lubricating oil can be suppressed. That is, the oil temperature can be adjusted appropriately.

FIG. 7 is a control flowchart executed by the lubricator of the internal combustion engine according to the modified example of the present invention.

First, in step S201, the control unit 15 acquires the oil temperature T detected by the oil temperature sensor 100, and the control unit 15 determines whether or not the oil temperature T is less than the second threshold value T2 (step S202). ..

In step S202, when the control unit 15 determines that "the temperature T of the lubricating oil is less than T2" (step S202: Yes), the control unit 15 returns the exhaust port side by controlling the first control valve 110 to the open side. The amount of oil flowing through the oil passage 11 is increased (step S203), and the lubricator 200 ends the control flow. When the control unit 15 determines that the temperature T of the lubricating oil is T2 or higher (step S202: No), the process proceeds to step 204.

In step S204, the control unit 15 determines whether or not the temperature T of the acquired lubricating oil is equal to or higher than the first threshold value T1. When the control unit 15 determines that the temperature T of the lubricating oil is less than T1 (step S204: No), it is determined that the lubricating oil does not thermally deteriorate, and the lubricating device 200 ends the control flow. When the control unit 15 determines that "the temperature T of the lubricating oil is T1 or higher" (step S204: Yes), the control unit 15 controls the first control valve 110 to the closed side to open the exhaust port side return oil passage 11. The amount of flowing oil is reduced (step 205), and the lubricator 200 ends the control flow.

As described above, according to the modified example, when the oil temperature is lower than T2, the amount of oil flowing through the exhaust port side return oil passage 11 is increased by controlling the first control valve 110 to the open side for lubrication. The temperature of the oil can be easily raised. On the other hand, when the oil temperature is as high as T1 or higher, the oil temperature rise is suppressed by controlling the first control valve 110 to the closed side to reduce the amount of oil flowing through the exhaust port side return oil passage 11, and the lubricating oil. It is possible to suppress the thermal deterioration of. That is, the oil temperature can be adjusted appropriately even when the oil temperature is high or low.

(Embodiment 2)
FIG. 8 is a cross-sectional view of the internal combustion engine according to the second embodiment of the present invention. The description of the same configuration as in FIG. 4 will be omitted. In addition to the configuration of the first embodiment, the intake port side return oil passage 12 is provided with a second control valve 120 capable of adjusting the amount of lubricating oil. The second control valve 120 is a valve having the same configuration as the first control valve 110, and is controlled by the control unit 15 based on the oil temperature. The specific control method will be described later.

FIG. 9 is a block diagram of a lubrication device for an internal combustion engine according to a second embodiment of the present invention. The same configuration as in FIG. 5 will not be described. In addition to FIG. 5, the intake port side return oil passage 12 is provided with a second control valve 120 capable of adjusting the amount of oil, and the second control valve 120 is connected to the control unit 15 via electrical wiring. Has been done. Further, the control unit 15 controls the first control valve 110 and the second control valve 120 based on the oil temperature acquired from the oil temperature sensor 100. The specific control method will be described later.

FIG. 10 is a control flowchart executed by the lubricator of the internal combustion engine according to the second embodiment of the present invention.

First, in step S301, after the control unit 15 acquires the oil temperature T detected by the oil temperature sensor 100, the control unit 15 determines whether or not the oil temperature T is less than the second threshold value T2 (step S302). ..

When the control unit 15 determines in step S302 that "the temperature T of the lubricating oil is less than T2" (step S302: Yes), the control unit 15 returns the exhaust port side by controlling the first control valve 110 to the open side. The amount of oil flowing through the oil passage 11 is increased. At the same time, by controlling the second control valve 120 to the closed side, the amount of oil flowing through the intake port side return oil passage 12 is reduced (step S303), and the lubricator 200 ends the control flow. When the control unit 15 determines that the temperature T of the lubricating oil is T2 or higher (step S302: No), the process proceeds to step 304.

In step S304, the control unit 15 determines whether or not the temperature T of the acquired lubricating oil is equal to or higher than the first threshold value T1. When the control unit 15 determines that the temperature T of the lubricating oil is less than T1 (step S304: No), it is determined that the lubricating oil does not thermally deteriorate, and the lubricating device 200 ends the control flow. When the control unit 15 determines that "the temperature T of the lubricating oil is T1 or higher" (step S304: Yes), the control unit 15 controls the first control valve 110 to the closed side to open the exhaust port side return oil passage 11. The amount of oil flowing is reduced, and the amount of oil flowing through the intake port side return oil passage 12 is increased by controlling the second control valve 120 to the open side (step 305), and the internal combustion engine 1 ends the control flow.

As described above, according to the second embodiment, when the oil temperature is low, the amount of oil flowing through the intake port side return oil passage 12 can be reduced and the amount of oil flowing through the exhaust port side return oil passage 11 can be increased. it can. As a result, as compared with the first embodiment, the amount of oil can be concentrated on the exhaust port side, and the temperature can be more easily raised. That is, the oil temperature can be adjusted more appropriately.

(Other embodiments)
The present invention should not be limited only by the above-described embodiment. For example, in the above-described first embodiment, the exhaust port side return oil passage 11 is divided into a cylinder head return oil passage 11a and a cylinder block return oil passage 11b. However, it may be formed by one return oil passage, and the number of the exhaust port side return oil passages 11 may be one, and the shape is not limited to this.

In the first and second embodiments, the first control valve 110 or the second control valve 120 is provided on each return oil passage of the intake port side return oil passage 11 and the exhaust port side return oil passage 12, but the intake port side return is provided. One may be provided at a branch point between the oil passage 12 and the exhaust port side return oil passage 11, and the amount of oil flowing through each may be adjusted.

In the above-described first and second embodiments, the oil temperature is used as an index value that correlates with the oil temperature, but the cooling water temperature of the internal combustion engine 1 may be used, and the present invention is not limited to these as long as the oil temperature is correlated.

In the first and second embodiments, when the internal combustion engine 1 is tilted, a weir or an oil pump that dams the flow may be provided in the cylinder head 41 in order to prevent the amount of oil from being biased due to the tilt.

1 Internal engine 100 Oil temperature sensor 2 Oil pan 3 Lubrication system 31 Oil strainer 31a Suction port 31b Strainer flow path 32 Oil pump 33 Oil filter 34 Oil transport pipes 35, 36, 37, 38 Oil supply pipes 4 Engine block 40 Cylinder block 41 Cylinder head 11 Exhaust port side return oil passage 11a, 12a Cylinder head return oil passage 11b, 12b Cylinder block return oil passage 11c Consolidation part 110 First control valve 111 Valve body 112 Storage part 113 Valve seat 12 Intake port side return oil passage 120 2nd control valve 13 ECU
14 Storage unit 15 Control unit 17 Piston 18 Crankshaft 19, 20 Camshaft 21 Water jacket 22 Cylinder 23 Connecting rod 24 Crankcase 26 Intake passage 27 Exhaust passage 28 Intake valve 29 Exhaust valve 200 Lubrication device

Claims (5)

After being supplied to each part of the internal combustion engine, the exhaust port side return oil passage provided on the exhaust port side to supply to the oil pan,
In the lubricating device of an internal combustion engine in which the lubricating oil flows by branching to the intake port side return oil passage provided on the intake port side.
A lubricating device for an internal combustion engine, characterized in that an internal combustion engine lubricating device includes an adjusting mechanism that reduces the amount of oil flowing through the exhaust port side return oil passage when the index value correlated with the temperature of the lubricating oil is high as compared with when it is low. The lubricating device for an internal combustion engine according to claim 1, wherein the index value is the temperature of the lubricating oil or the cooling water temperature of the internal combustion engine. The adjustment mechanism according to claim 1 or 2, wherein when the index value is equal to or higher than the first threshold value, the amount of oil flowing through the exhaust port side return oil passage is smaller than when the index value is less than the first threshold value. The lubrication device for an internal combustion engine as described. The adjusting mechanism increases the amount of oil flowing into the exhaust port side return oil passage when the index value is less than the second threshold value set to be smaller than the first threshold value and more than when the index value is equal to or more than the second threshold value. The lubrication device for an internal combustion engine according to claim 3. The lubrication device for an internal combustion engine according to any one of claims 1 to 4, wherein the adjusting mechanism is a hydraulic valve or a solenoid valve.

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