JP4508046B2 - Lubricating device for internal combustion engine - Google Patents

Description

  The present invention relates to a lubricating device for lubricating a sliding portion or the like of an internal combustion engine represented by an automobile engine or the like with lubricating oil. In particular, the present invention relates to a measure for easily recognizing the total amount of lubricating oil in the internal combustion engine.

  2. Description of the Related Art Conventionally, a so-called dry sump system is known as a lubrication device mounted on an automobile engine. This system has an oil tank arranged separately from the engine body, and the lubricating oil (hereinafter sometimes referred to simply as oil) collected in the oil pan below the crank chamber of the engine body is transferred by a scavenging pump. Take out and temporarily store in the oil tank. The oil in the oil tank is supplied to each lubricated part such as a sliding part inside the engine body by a feed pump to reduce friction and cool each part of the engine (for example, the following patent document). 1). According to this method, the height of the oil pan can be shortened to reduce the size of the engine body, and the oil can be stably stored in the oil tank. Oil can be supplied stably.

Further, in Patent Documents 2 and 3 below, when an oil tank and an oil pan are connected by an overflow passage and the oil amount in the oil tank reaches a predetermined amount or more, that is, the oil level in the oil tank overflows. It is disclosed that when the passage height of the passage is exceeded, a part of the oil in the oil tank is returned to the oil pan through the overflow passage, thereby maintaining the oil amount in the oil tank below a predetermined amount. .
JP 2003-278517 A JP 2001-317319 A Japanese Patent Laid-Open No. 2002-21523

  By the way, as a method for recognizing that the total amount of oil in the engine is reduced due to oil leakage or the like in the engine, the oil storage amount in the oil pan is confirmed by an oil level gauge when the engine is stopped. . That is, when an oil leak or the like occurs, the amount of oil collected in the oil pan is also reduced, and this is confirmed by an oil level gauge to determine the necessity of maintenance such as oil replenishment.

  In addition, an oil level sensor is installed in the oil pan to detect the oil level (oil level position), so that the oil check work using the oil level gauge is not necessary. A warning is issued when the amount falls below the fixed amount (such as MIL lighting on the meter panel).

  In the dry sump type lubrication device, the scavenging pump is generally driven by the rotational force of the crankshaft, so that the scavenging pump is also stopped almost simultaneously with the stop of the engine. Oil recovery to the tank is stopped. Moreover, after this engine stop, the oil which exists in each to-be-lubricated part inside an engine main body will dripped gradually in an oil pan. That is, after the engine is stopped, the amount of oil stored in the oil tank is maintained at the amount of oil at the time of engine stop, while the amount of oil stored in the oil pan gradually increases after the engine is stopped. That is, the amount of oil finally stored in the oil pan greatly depends on the amount of oil present in each lubricated portion. For example, when the engine stops from a high rotation state, a relatively large amount of oil is present in each lubricated portion, and the amount of oil stored in the oil tank is reduced accordingly. For this reason, the amount of oil finally stored in the oil pan increases. On the contrary, when the engine is stopped from the low rotation state, the amount of oil present in each lubricated portion is relatively small, so that the amount of oil finally stored in the oil pan after the engine is stopped is also small. The oil storage amount in the oil tank is increased accordingly. In this way, after the engine is stopped, the oil inside the engine is distributed and stored in the oil pan and the oil tank, and the ratio between the oil storage amount in the oil pan and the oil storage amount in the oil tank is not constant. However, it fluctuates greatly due to the influence of the engine speed immediately before stopping.

  For this reason, even if the oil amount in the oil pan is recognized by an oil level gauge or the like as described above after the engine is stopped, the oil storage amount in the oil tank is unknown, and the oil storage amount in the oil pan and the oil storage in the oil tank are Since the ratio to the amount also varies depending on the situation (engine speed immediately before stopping), it is difficult to accurately recognize the total amount of oil in the engine.

  As a result, for example, if the amount of oil stored in the oil tank when the engine is stopped is extremely large, the amount of oil stored in the oil pan will be smaller than the oil leakage judgment amount, which is sufficient for the total amount of oil in the engine. Despite being sufficient, it may be judged that the oil is insufficient. Conversely, if the amount of oil stored in the oil tank when the engine is stopped is extremely small, the amount of oil stored in the oil pan is greater than the oil leakage judgment amount, even though the total amount of oil in the engine is insufficient. This oil shortage state may not be recognized.

  In order to eliminate such problems, a sensor that detects the amount of oil stored in the oil tank is provided separately from the oil level gauge that detects the amount of oil stored in the oil pan. However, this is not preferable because a special sensor is required in the oil tank.

  Further, as in Patent Documents 2 and 3 described above, if the amount of oil in the oil tank is maintained below a predetermined amount by causing the oil in the oil tank to overflow through the overflow passage, the amount of oil in the oil pan can be reduced. The total amount of oil can be estimated to some extent. However, simply providing an overflow passage causes the oil level in the oil tank to be lower than the opening position of the overflow passage even during engine operation, and there are problems described below.

  For example, when a vehicle travels on an inclined road or when a lateral G (centrifugal force) acts along with a turn, the oil in the oil tank is shifted to one side. In this case, when the suction port of the oil suction pipe for sucking out the oil in the oil tank toward the feed pump is exposed to the air, the oil is not introduced into the feed pump (the so-called pump is in a dry state). ) In addition to not being able to smoothly circulate the oil, the lubricity of each sliding part in the pump mechanism in the feed pump is deteriorated, leading to wear of pump components and ensuring the sealability of the seal part. It will lead to worsening the reliability of the pump.

  The present invention has been made in view of such a point, and the object of the present invention is to ensure the reliability of a pump for sending oil in an oil tank to a dry sump type lubrication device, while ensuring the reliability of the pump in the engine. An object of the present invention is to provide a lubricating device for an internal combustion engine that can accurately recognize the total amount of oil.

-Principle of solving the problem-
The solution of the present invention devised in order to achieve the above object is to allow only the oil introduction from the oil pan to the oil tank when the engine is operated as a form of oil distribution between the oil pan and the oil tank. In this way, the amount of oil in the oil tank is ensured, while the oil return operation from the oil tank to the oil pan is performed when the engine is stopped, and the oil amount in the oil tank when the oil return operation is completed Is always set to a constant amount so that the total amount of oil in the engine can be recognized only by detecting the amount of oil in the oil pan.

-Solution-
Specifically, the present invention includes a lubricating oil recovery part that recovers lubricating oil after lubricating a lubricated part of an internal combustion engine, and a lubricating oil storage part connected to the lubricating oil recovery part via a lubricating oil discharge passage And a lubricating device for an internal combustion engine that includes a lubricating oil supply passage that supplies the lubricating oil stored in the lubricating oil storage portion toward the lubricated portion of the internal combustion engine. With respect to the lubricating device for the internal combustion engine, when the internal combustion engine is stopped, a part of the lubricating oil in the lubricating oil storage unit is used as a lubricating oil recovery unit so that the lubricating oil amount in the lubricating oil storage unit becomes a predetermined specified amount. Lubricating oil return passage to be sent out, and prohibiting means for prohibiting return of lubricating oil from the lubricating oil storage portion to the lubricating oil recovery portion by the lubricating oil return passage during operation of the internal combustion engine.

  Due to this specific matter, when the internal combustion engine is stopped, surplus lubricating oil in the lubricating oil reservoir (lubricated oil exceeding the specified amount) is sent from the lubricating oil reservoir to the lubricating oil recovery unit via the lubricating oil return passage. That is, the total amount of lubricating oil in the internal combustion engine is equal to the lubricating oil amount in the lubricating oil reservoir (always constant when the internal combustion engine is stopped), and the lubricating oil amount in the lubricating oil recovery unit confirmed by an oil level gauge or the like. It can be recognized as an added amount. Accordingly, the total amount of lubricating oil in the internal combustion engine can be recognized only by detecting the amount of lubricating oil in the lubricating oil recovery unit by this oil level gauge or the like. On the other hand, during operation of the internal combustion engine, the return of the lubricating oil from the lubricating oil storage part to the lubricating oil recovery part by the lubricating oil return passage is prohibited by the prohibiting means, so the amount of lubricating oil in the lubricating oil storage part can be secured, for example, In the case where the vehicle is mounted on an automobile, even if the automobile travels on an inclined road or a lateral G (centrifugal force) acts along with a turn, the lubricating oil is biased to one side in the lubricating oil reservoir. , It is possible to prevent the suction port of the lubricating oil supply passage from being exposed to the air, to smoothly circulate the lubricating oil, and to maintain good lubricity of each sliding portion in the pump mechanism. The wear of the pump components can be prevented, and furthermore, the sealability of the seal location can be secured well.

  Specific examples of the prohibiting means include the following.

  First, a closing member capable of opening and closing the lubricating oil return passage is provided, and the closing member advances into the lubricating oil return passage by receiving the hydraulic pressure generated in the lubricating oil supply passage during operation of the internal combustion engine. The lubricating oil return passage is closed.

  In addition, an electromagnetic valve that can open and close the lubricating oil return passage is provided, and this electromagnetic valve is closed when the internal combustion engine is operated to close the lubricating oil return passage, and is opened when the internal combustion engine is stopped to return the lubricating oil. The passage is opened.

  In addition, the following solutions can be cited as other solutions taken in order to achieve the above object. That is, a lubricating oil recovery part that recovers the lubricating oil after lubricating the lubricated part of the internal combustion engine, a lubricating oil storage part connected to the lubricating oil recovery part via the lubricating oil discharge passage, and the lubricating oil storage part And a lubrication device for an internal combustion engine provided with a lubrication oil supply passage for supplying the lubricant stored in the cylinder toward the lubrication target portion of the internal combustion engine. With respect to the lubricating device of the internal combustion engine, the lubricating oil collected by the lubricating oil collecting unit during operation of the internal combustion engine is sent to the lubricating oil discharge passage toward the lubricating oil storing unit, while the lubricating oil is stored when the internal combustion engine is stopped. In this configuration, the pump means for allowing a part of the lubricating oil in the lubricating oil reservoir to return to the lubricating oil collecting part is provided so that the amount of lubricating oil in the part becomes a predetermined specified amount.

  According to this specific matter, the operation of feeding the lubricating oil collected in the lubricating oil collecting section to the lubricating oil storing section and the returning operation of a part of the lubricating oil in the lubricating oil storing section to the lubricating oil collecting section are performed in one passage. (Existing lubricating oil discharge passage) It is possible to achieve the reliability of the pump and the accurate recognition of the total amount of lubricating oil without adding a new passage (pipe).

  In the present invention, during operation of the internal combustion engine, the amount of oil in the lubricating oil reservoir is ensured by prohibiting the return of the lubricating oil through the lubricating oil return passage from the lubricating oil reservoir to the lubricating oil recovery unit, while the internal combustion engine is stopped. Sometimes, a part of the lubricating oil in the lubricating oil reservoir is returned to the lubricating oil recovery part by the lubricating oil return passage so that the amount of lubricating oil in the lubricating oil reservoir is set to a predetermined specified amount. For this reason, the amount of lubricating oil in the lubricating oil reservoir during operation of the internal combustion engine can be ensured, the lubricity of each sliding part in the pump mechanism can be maintained well, and the wear of the pump components is prevented and the sealing performance of the sealing portion is improved. The reliability of the pump can be secured. In addition, when the internal combustion engine is stopped, the total amount of lubricating oil in the internal combustion engine can be recognized only by detecting the amount of lubricating oil in the lubricating oil recovery unit using an oil level gauge, etc. And it becomes possible to recognize correctly.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. This embodiment demonstrates the case where this invention is applied as a lubrication apparatus mounted in the engine for motor vehicles.

(First embodiment)
First, the first embodiment will be described.

-Configuration explanation of engine and lubrication system-
FIG. 1 is a system configuration diagram showing an outline of an engine body 1 and a lubrication device 2 according to the present embodiment. As shown in FIG. 1, a plurality of cylindrical cylinders 11 are formed in the cylinder block of the engine body 1 along the cylinder row direction (direction orthogonal to the paper surface of FIG. 1). 12 is accommodated so as to be reciprocally movable in the vertical direction. The reciprocating motion of the piston 12 is converted into the rotational motion of the crankshaft 14 via the connecting rod 13. Oil (lubricating oil) circulating inside the engine body 1 is supplied to lubricated parts such as the bearing parts of the crankshaft 14 and the connecting rod 13 and the sliding part between the piston 12 and the cylinder 11 to reduce the frictional resistance. , Keep the lubricated parts airtight, prevent corrosion, cool down, etc. An oil pan (lubricating oil recovery part) 16 is disposed at the lower part of the crankcase 15 so that the oil circulated through the lubricated part is dropped and recovered in the oil pan 16.

  The crankcase 15 is provided with an oil level gauge guide 17, and an oil level gauge 18 is inserted through the oil level gauge guide 17. The oil level gauge 18 is used for checking the amount of oil stored in the oil pan 16 (oil level height), and an operator pulls out the oil level gauge 18 from the oil level gauge guide 17 to obtain the oil level gauge. The oil storage amount can be inspected by checking the oil adhesion position of 18.

  The lubrication device 2 includes an oil tank (lubricating oil storage unit) 21 provided separately from the oil pan 16. The oil tank 21 and the oil pan 16 are connected by an oil discharge pipe 22 that constitutes a lubricating oil discharge passage. One end (upstream end) of the oil discharge pipe 22 is connected to a position in the vicinity of the bottom of the side surface of the oil pan 16, while the other end (downstream end) penetrates the upper surface of the oil tank 21 and the internal space of the oil tank 21. It is open at. Further, a scavenging pump 23 is provided in the oil discharge pipe 22, and the oil dropped and collected in the oil pan 16 by the driving of the scavenging pump 23 is stored in the oil tank 21 through the oil discharge pipe 22. It has become so.

  The oil tank 21 is connected to an oil supply pipe 24 constituting a lubricating oil supply passage. One end (upstream end) of the oil supply pipe 24 is immersed in the oil stored in the oil tank 21, while the other end (downstream end) is connected to an oil supply path connected to each lubricated portion of the engine body 1. ing. An oil strainer 25 for filtering oil is attached to one end of the oil supply pipe 24 (the end on the oil tank 21 side). The oil supply pipe 24 is provided with a feed pump 26. By driving the feed pump 26, the oil in the oil tank 21 is filtered by the oil strainer 25, and wear metal powder, sludge and the like are removed. After that, it is supplied toward each lubricated part of the engine body 1.

  The scavenging pump 23 and the feed pump 26 are mechanical oil pumps such as trochoid pumps and gear pumps that operate by obtaining mechanical power of the engine body 1 (rotational force of the crankshaft 14). Yes. For this reason, during engine operation, the pumps 23 and 26 are driven, and the oil that has passed through the lubricated portion of the engine body 1 flows into the crankcase 15, the oil pan 16, the oil discharge pipe 22, the oil tank 21, and the oil supply pipe 24. Then, the circulation operation is performed again, which is supplied to the lubricated portion of the engine body 1.

  In addition, as the scavenging pump 23 and the feed pump 26, it is also possible to employ an electric oil pump that operates using the rotational torque of the electric motor. If this electric oil pump is employed, a necessary amount of oil can be supplied at an appropriate timing according to the running state of the vehicle regardless of the operation of the engine.

  Next, a configuration that characterizes the present embodiment will be described. As shown in FIG. 1, the lubrication device 2 according to the present embodiment includes an oil return pipe 3 that constitutes a lubricant return path that connects the oil tank 21 and the oil pan 16, in addition to the oil discharge pipe 22. Is provided. The oil return pipe 3 has one end (upstream end) connected to a position slightly above the center position in the vertical direction on the side surface of the oil tank 21, and the other end (downstream end) on the side surface of the oil pan 16. It is connected to a position slightly above the connection position of the oil discharge pipe 22. The oil return pipe 3 is inclined downward from the oil tank 21 side toward the oil pan 16 side.

  For this reason, in a situation where the oil return pipe 3 is not closed (the configuration for closing will be described later), the oil level of the oil in the oil tank 21 exceeds the connection position of the oil return pipe 3. In this case, the overflow amount is discharged to the oil return pipe 3 and flows down into the oil pan 16 by its own weight. For example, if the oil level of the oil in the oil tank 21 is at the position of the phantom line in the figure, the overflow amount is reduced by the oil return pipe 3 until the oil level of the oil reaches the position of the solid line in the figure. The oil tank 21 is returned to the oil pan 16.

  The oil return pipe 3 is provided with a mechanism (prohibiting means in the present invention) that closes the inside of the oil return pipe 3 during engine operation. Hereinafter, this mechanism will be described. As shown in FIG. 2, a hydraulic action pipe 31 is provided between the oil return pipe 3 and the oil supply pipe 24. One end of the hydraulic operation pipe 31 is connected to an intermediate portion of the oil return pipe 3, and the other end is connected to the downstream side (discharge side) of the feed pump 26 in the oil supply pipe 24. In addition, a cylindrical space S whose inner diameter dimension substantially matches the inner diameter dimension of the hydraulic action pipe 31 is formed at a connection portion of the hydraulic action pipe 31 with respect to the oil return pipe 3. A cylindrical closing member 32 and a coil spring 33 that applies an upward biasing force to the closing member 32 are accommodated. That is, a circular seat surface 3a for supporting the lower end of the coil spring 33 is formed at the bottom of the space S, and the closing member 32 is vertically moved above the coil spring 33 supported by the seat surface 3a. It is housed so that it can slide in the direction. Further, the closing member 32 is made of metal, and the outer diameter dimension thereof is set to be equal to or slightly smaller than the inner diameter dimension of the hydraulic operation pipe 31.

  Therefore, when the feed pump 26 is not driven, no hydraulic pressure acts on the upper surface of the closing member 32, and the closing member 32 moves upward by the urging force of the coil spring 33 and opens the oil return pipe 3. (See the state shown in FIG. 2 (a)). On the other hand, when the feed pump 26 is driven, a hydraulic pressure (downward hydraulic pressure) acts on the upper surface of the closing member 32 from the hydraulic action pipe 31, and the closing member 32 moves downward against the urging force of the coil spring 33. Thus, the oil return pipe 3 is closed (see the state shown in FIG. 2B).

-Description of operation-
Next, the operation due to the provision of the oil return pipe 3 will be described.

  First, at the time of engine operation, the pumps 23 and 26 are driven in accordance with the operation of the engine, and the oil circulation operation described above is performed to lubricate each lubricated portion. Further, as the feed pump 26 is driven, the discharge pressure acts on the upper surface of the closing member 32 through the hydraulic action pipe 31, and the closing member 32 moves downward against the urging force of the coil spring 33, and the oil The return pipe 3 is closed (see FIG. 2B). For this reason, even if the amount of oil in the oil tank 21 increases and the oil level height reaches above the connection position of the oil return pipe 3 (for example, at the position of the phantom line in FIG. 1). The oil does not return to the oil pan 16 from the oil return pipe 3. That is, since the oil level height position in the oil tank 21 is maintained high, a lateral G (centrifugal force) acts as the vehicle travels on the ramp or turns, so that the oil is in the oil tank 21. Even if it is deviated to one side, it is suppressed that the suction port of the oil supply pipe 24 (suction port of the oil strainer 25) is exposed to the air, and oil is not introduced into the feed pump 26. Can be avoided. Therefore, the oil circulation operation can be performed smoothly, the lubricity of each sliding portion in the pump mechanism in the feed pump 26 can be maintained well, and the wear of the pump components can be prevented. It is possible to ensure good sealing performance.

  When the engine is stopped, the pumps 23 and 26 are stopped along with the engine stop, and the hydraulic pressure generated in the pipes 22, 24 and 31 is also lowered. For this reason, the hydraulic pressure acting on the upper surface of the closing member 32 via the hydraulic action pipe 31 is also lowered, and the closing member 32 is moved upward by the urging force of the coil spring 33, whereby the oil return pipe 3 is opened. (See FIG. 2 (a)). For this reason, the oil tank 21 and the oil pan 16 are in communication with each other through the oil return pipe 3. In the oil tank 21, the oil above the connection position of the oil return pipe 3 with respect to the oil tank 21 is regarded as an overflow. It is discharged into the oil return pipe 3 and flows down into the oil pan 16 by its own weight (see the arrow in FIG. 2A). For example, if the oil level of the oil in the oil tank 21 is at the position of the phantom line in the figure, the overflow amount is reduced by the oil return pipe 3 until the oil level of the oil reaches the position of the solid line in the figure. The oil tank 21 is returned to the oil pan 16. For this reason, after all of this overflow amount has flowed into the oil pan 16, the amount of oil in the oil tank 21 becomes a predetermined amount (reference amount). For example, if the oil storage amount when the oil level in the oil tank 21 coincides with the opening position of the oil return pipe 3 is set to 4 liters, the oil in the oil tank 21 is stopped after the engine is stopped. The surplus is returned to the oil pan 16 until the oil storage amount reaches 4 liters. Therefore, the total amount of oil in the engine (including oil in the oil tank 21) is equal to the amount of oil in the oil tank 21 (always constant amount), and the amount of oil in the oil pan 16 confirmed by the oil level gauge 18. It can be recognized as an amount obtained by adding. Therefore, the total amount of oil in the engine can be recognized only by detecting the amount of oil in the oil pan 16 by the oil level gauge 18. For example, in the above case, when the oil amount in the oil pan 16 is 1.5 liters, it can be determined that the total oil amount is 5.5 liters, and when the oil amount in the oil pan 16 is 2 liters. It can be determined that the total amount of oil is 6 liters.

  As described above, according to the present embodiment, when the engine is operated, a sufficient amount of oil in the oil tank 21 can be secured, and the oil can be satisfactorily introduced into the feed pump 26. Lubrication and the like can be performed satisfactorily, and the reliability of the feed pump 26 is also ensured. On the other hand, in the oil check operation performed when the engine is stopped, the total oil amount in the engine can be accurately recognized only by checking the oil amount in the oil pan 16 by the oil level gauge 18. Thus, in this embodiment, it is possible to accurately recognize the total amount of oil in the engine while ensuring the reliability of the feed pump 26.

(Second Embodiment)
Next, a second embodiment will be described. The present embodiment is a modified example of a mechanism (prohibiting means) for closing the oil return pipe 3, and other configurations and operations are the same as those of the first embodiment described above. Therefore, only the differences from the first embodiment will be described here.

  FIG. 3 is a system configuration diagram showing an outline of the engine main body 1 and its lubricating device 2 according to the present embodiment. As shown in FIG. 3, the lubricating device 2 according to the present embodiment does not include the hydraulic operation pipe 31, and the oil return pipe 3 is provided with an electromagnetic valve 34 that can be controlled to open and close. That is, an opening / closing operation is performed by a control signal of an ECU (Electronic Control Unit) that controls the engine, and the opening and closing of the oil return pipe 3 are switched.

  As an operation in the present embodiment, the solenoid valve 34 is closed during engine operation. As a result, the oil return pipe 3 is also closed. For this reason, even if the amount of oil in the oil tank 21 increases and the oil level height reaches above the connection position of the oil return pipe 3 (for example, at the position of the phantom line in FIG. 3). The oil does not return to the oil pan 16 from the oil return pipe 3. That is, since the oil level height position in the oil tank 21 is kept high, even if the oil is shifted to one side in the oil tank 21, the suction port of the oil supply pipe 24 (suction port of the oil strainer 25) Exposure to the air is suppressed, and a situation where oil is not introduced into the feed pump 26 can be avoided.

  On the other hand, when the engine is stopped, the electromagnetic valve 34 is opened. As a result, the oil return pipe 3 is also opened. For this reason, the oil tank 21 and the oil pan 16 are in communication with each other through the oil return pipe 3. In the oil tank 21, the oil above the connection position of the oil return pipe 3 with respect to the oil tank 21 is regarded as an overflow. It is discharged to the oil return pipe 3 and flows down into the oil pan 16 by its own weight. For example, if the oil level of the oil in the oil tank 21 is at the position of the phantom line in the figure, the overflow amount is reduced by the oil return pipe 3 until the oil level of the oil reaches the position of the solid line in the figure. The oil tank 21 is returned to the oil pan 16. For this reason, after all of this overflow amount has flowed into the oil pan 16, the amount of oil in the oil tank 21 becomes a predetermined amount (reference amount). That is, the total amount of oil in the engine body 1 and the lubricating device 2 is an amount obtained by adding the amount of oil in the oil pan 16 confirmed by the oil level gauge 18 to the amount of oil in the oil tank 21 (a constant amount). It will be recognized. Therefore, the total amount of oil in the engine can be recognized only by detecting the amount of oil in the oil pan 16 by the oil level gauge 18.

(Third embodiment)
Next, a third embodiment will be described. The present embodiment is a modification of the configuration for circulating oil between the oil pan 16 and the oil tank 21, and the other configuration and operation are the same as those of the first embodiment described above. Therefore, only the differences from the first embodiment will be described here.

  FIG. 4 is a system configuration diagram showing an outline of the engine main body 1 and the lubricating device 2 thereof according to the present embodiment. As shown in FIG. 4, in the lubricating device 2 in the present embodiment, one end (the end on the oil pan 16 side) of the oil discharge pipe 22 that connects the oil tank 21 and the oil pan 16 is the oil pan 16. The other end (the end on the oil tank 21 side) is connected to a position in the vicinity of the bottom of the side surface of the oil tank 21 and is substantially the same as the connection position of the oil return pipe 3 in each of the above-described embodiments. It is connected to a position slightly above the center position in the vertical direction.

  Further, the scavenging pump 23 provided in the oil discharge pipe 22 is configured to supply the oil dropped and collected in the oil pan 16 to the oil tank 21 through the oil discharge pipe 22 during driving accompanying the operation of the engine. On the other hand, when the engine stops, the oil flow path formed in the scavenging pump 23 is opened so that oil can flow freely. For this reason, when the oil level in the oil tank 21 exceeds the connection position of the oil discharge pipe 22 when the engine is stopped, the overflow is discharged to the oil discharge pipe 22 and the scavenging pump 23. It is configured to pass through the inside and flow down into the oil pan 16 by its own weight. For example, if the oil level of the oil in the oil tank 21 is at the position of the phantom line in the figure, the overflow amount is reduced by the oil discharge pipe 22 until the oil level of the oil reaches the position of the solid line in the figure. The oil tank 21 is returned to the oil pan 16.

  As an operation in the present embodiment, when the engine is operated, the scavenging pump 23 is driven, and the oil dropped and collected in the oil pan 16 is supplied to the oil tank 21 through the oil discharge pipe 22. Even when the oil surface height of the oil in the tank 21 exceeds the connection position of the oil discharge pipe 22, the oil does not flow back through the oil discharge pipe 22, and the oil in the oil tank 21 flows into the oil pan 16. It will not be returned to. For this reason, even if the oil surface height position in the oil tank 21 is maintained high and the oil is shifted to one side in the oil tank 21, the suction port of the oil supply pipe 24 (the suction port of the oil strainer 25) is air. Exposure to the inside is suppressed, and a situation where oil is not introduced into the feed pump 26 can be avoided.

  On the other hand, when the engine is stopped, the scavenging pump 23 is stopped, the oil flow path in the scavenging pump 23 is opened, and the oil level height of the oil in the oil tank 21 is the connection position of the oil discharge pipe 22. When the pressure exceeds the value, the overflow amount is discharged to the oil discharge pipe 22 and flows down into the oil pan 16 by its own weight. For example, if the oil level of the oil in the oil tank 21 is at the position of the phantom line in the figure, the overflow amount is reduced by the oil discharge pipe 22 until the oil level of the oil reaches the position of the solid line in the figure. The oil tank 21 is returned to the oil pan 16. For this reason, after all of this overflow amount has flowed into the oil pan 16, the amount of oil in the oil tank 21 becomes a predetermined amount (reference amount). That is, the total amount of oil in the engine body 1 and the lubricating device 2 is an amount obtained by adding the amount of oil in the oil pan 16 confirmed by the oil level gauge 18 to the amount of oil in the oil tank 21 (a constant amount). It will be recognized. Therefore, the total amount of oil in the engine can be recognized only by detecting the amount of oil in the oil pan 16 by the oil level gauge 18.

-Other embodiments-
Each embodiment described above demonstrated the case where this invention was applied as a lubricating device mounted in the engine for motor vehicles. The present invention is applicable not only to automobiles but also to engines used for other purposes.

  Further, in each of the above-described embodiments, the total amount of oil in the engine body 1 and the lubrication device 2 is recognized by detecting the amount of oil in the oil pan 16 by the oil check operation using the oil level gauge 18. The present invention is not limited to this. Instead of the oil level gauge 18, an oil level sensor is installed in the oil pan 16, and the amount of oil in the oil pan 16 is detected by the oil level sensor, whereby the engine body 1 and The total oil amount of the lubricating device 2 may be recognized. In this case, when the detected amount of oil in the oil pan 16 becomes a predetermined amount or less, a warning light on the meter panel in the passenger compartment is lit to warn the driver of the necessity for maintenance.

1 is a system configuration diagram illustrating an outline of an engine body and a lubrication apparatus according to a first embodiment of the present invention. (A) is sectional drawing for demonstrating operation | movement of the closing member at the time of an engine stop, (b) is sectional drawing for demonstrating operation | movement of the closing member at the time of engine operation. It is a system block diagram which shows the outline of the engine main body and lubrication apparatus which concern on 2nd Embodiment of this invention. It is a system block diagram which shows the outline of the engine main body and lubricating device which concern on 3rd Embodiment of this invention.

Explanation of symbols

16 Oil pan (lubricating oil recovery part)
21 Oil tank (lubricant reservoir)
22 Oil discharge piping (lubricating oil discharge passage)
24 Oil supply piping (lubricating oil supply passage)
3 Oil return piping (lubricant return passage)
31 Hydraulic action piping 32 Closing member 33 Coil spring 34 Solenoid valve

Claims (4)

A lubricating oil recovery part that recovers the lubricating oil after lubricating the lubricated part of the internal combustion engine, a lubricating oil storage part connected to the lubricating oil recovery part via a lubricating oil discharge passage, and a lubricating oil storage part In a lubricating device for an internal combustion engine comprising a lubricating oil supply passage for supplying the stored lubricating oil toward a lubricated portion of the internal combustion engine,
A lubricating oil return passage for returning a part of the lubricating oil in the lubricating oil reservoir to the lubricating oil recovery unit so that the amount of lubricating oil in the lubricating oil reservoir becomes a predetermined specified amount when the internal combustion engine is stopped;
A lubricating device for an internal combustion engine, comprising: prohibiting means for prohibiting the return of the lubricating oil from the lubricating oil storing portion to the lubricating oil collecting portion by the lubricating oil return passage during operation of the internal combustion engine. In the internal combustion engine lubrication device according to claim 1,
The prohibiting means includes a closing member that can open and close the lubricating oil return passage, and this closing member advances into the lubricating oil return passage by receiving the hydraulic pressure generated in the lubricating oil supply passage during operation of the internal combustion engine. A lubricating device for an internal combustion engine, wherein the lubricating oil return passage is closed. In the internal combustion engine lubrication device according to claim 1,
The prohibiting means includes an electromagnetic valve that can open and close the lubricating oil return passage. The electromagnetic valve is closed when the internal combustion engine is operated to close the lubricating oil return passage, and is opened when the internal combustion engine is stopped. A lubricating device for an internal combustion engine, characterized in that the lubricating oil return passage is opened. A lubricating oil recovery part for recovering the lubricating oil after lubricating the lubricated part of the internal combustion engine; a lubricating oil storage part connected to the lubricating oil recovery part via a lubricating oil discharge passage; and the lubricating oil storage part In a lubricating device for an internal combustion engine comprising a lubricating oil supply passage for supplying the stored lubricating oil toward a lubricated portion of the internal combustion engine,
In the lubricating oil discharge passage, the lubricating oil collected by the lubricating oil collecting unit during operation of the internal combustion engine is sent out toward the lubricating oil storing unit, while the amount of lubricating oil in the lubricating oil storing unit is predetermined when the internal combustion engine is stopped. A lubricating device for an internal combustion engine, comprising pump means for allowing a part of the lubricating oil in the lubricating oil storage part to return to the lubricating oil recovery part so as to become a specified amount.

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