JP2006299860A - Lubricating structure of turbocharger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lubricating structure of a turbocharger superior in durability, while reducing a driving energy loss of an oil circulating pump. <P>SOLUTION: This lubricating structure has an oil level sensor 31 for detecting an oil level in oil collecting tanks 27L and 27R for recovering oil discharged from the turbochargers 10L and 10R by lubricating the turbochargers 10L and 10R by the oil supplied from an oil pan 25; and sends out the oil in the oil collecting tanks 27L and 27R to the oil pan 25 by oil recirculating pumps 28L and 28R by rotational driving of electric motors when an oil volume sensor 31 detects a preset oil level position L1 or more. The rotational driving of the electric motors 28Lm and 28Rm is controlled in response to the oil volume of oil stored in the oil collecting tanks 27L and 27R, and the energy loss can be largely reduced by largely restraining electric power consumption, and the superior durability can be secured. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a lubrication structure for a turbocharger, and more particularly to a lubrication structure for a turbocharger that supplies and lubricates oil from an oil reservoir to a turbocharger disposed in an engine body.

  For example, as shown in a cross-sectional view in FIG. 8, the turbocharger disposed in the vehicle engine has a turbine chamber 11 and a compressor chamber 12 integrally coupled via a center housing 13, and a turbine wheel 14 in the turbine chamber 11. The compressor wheel 15 in the compressor chamber 12 is connected by a turbine shaft 17 rotatably supported by a compressor wheel side bearing 16a and a turbine wheel side bearing 16b provided in the center housing 13. In the turbocharger 10, the compressor wheel 15 is rotated via the turbine shaft 7 by rotating the turbine wheel 14 with the exhaust gas from the exhaust manifold. The intake air compressed by the rotating compressor wheel 15 is sent to the intake manifold for supercharging.

  Since the turbine shaft 17 of the turbocharger 10 rotates at a high speed and becomes high temperature, it is necessary to sufficiently lubricate and cool the turbine wheel side bearing 16a and the compressor wheel side bearing 16b.

  For this reason, oil OL is supplied from an oil inlet 18a that opens to the upper part in the center housing 13, and is supplied to the turbine wheel side bearing 16a and the compressor wheel side bearing 16b through an oil supply passage 19 provided in the center housing 13, and this part is supplied. Lubricate and cool. The oil OL that has lubricated and cooled the turbine wheel side bearing 16a and the compressor wheel side bearing 16b is discharged from an oil outlet 18b that opens at the lower portion of the center housing 13 and collected.

  An oil seal portion for preventing the oil OL from leaking from between the center housing 13 and the turbine shaft 17 to the boundary portion between the center housing 13 and the turbine chamber 11 and the boundary portion between the center housing 13 and the compressor chamber 12. 20 is arranged. A portion of the oil seal portion 20 disposed between the center housing 13 and the turbine shaft 17 is provided so that excessive pressure contact force does not act on the turbine shaft 17 rotating at a high speed as shown in FIG. Is formed in an annular shape divided by the gap 20a.

  When such a turbocharger is mounted on a horizontally opposed engine for vehicles arranged vertically, the center of gravity of the vehicle body is lowered to improve running stability, and each bank, turbocharger, In order to improve the response by omitting the intermediate exhaust pipe interposed between the two and reducing the time lag of the turbocharger, it is known that the turbocharger is directly connected to the bottom of the left and right banks, that is, under the left and right banks. (For example, refer to Patent Document 1).

  This type of horizontally opposed engine with turbochargers disposed on the lower surfaces of the left and right banks is shown in FIG. 10 by an oil pump (not shown) disposed inside the engine body 111, as shown in the outline of the horizontally opposed engine. The oil OL in the oil pan 113 attached immediately below the crankcase 112 is sucked up and guided to the gallery in the crankcase 112 and the left and right banks 115L and 115R, and the valve operating mechanism in the cylinder head 116L of the left bank 115L. And supplied to the valve operating mechanism in the cylinder head 116R of the right bank 115R.

  On the other hand, oil OL is supplied to the turbocharger 10R disposed on the lower surface of the right bank 115R and the turbocharger 10L disposed on the lower surface of the left bank 115L through an oil passage branched from the gallery, respectively. Lubricate the superchargers 10R and 10L.

  The oil OL used for lubrication and cooling of the turbochargers 10R and 10L, the air pressurized by the turbine wheel in the turbine chamber, and the air pressurized by the compressor wheel in the compressor chamber are from the gap of the seal portion. The high-pressure turbo blow-by gas leaked into the center housing is located below the turbochargers 10R, 10L because the turbochargers 10R, 10L are located below the oil level La of the oil OL in the oil pan 113. Such as a scavenging pump that is disposed in the oil collecting tanks 121R and 121L and is connected to the oil collecting passages 121L and 121L, respectively, and is interposed in the oil collecting passage 122 and the oil collecting passage 122. Oil pan 113 is driven by oil circulation pump 123. It is issued. Further, the upper portion of the oil collecting tank 121 </ b> L communicates with the crankcase 112 through the pressure adjustment passage 124.

JP 2003-343274 A

  According to the turbocharger lubrication structure shown in Patent Document 1, the oil collecting tanks 121R and 121L for collecting the oil OL from the turbochargers 10R and 10L disposed on the lower surfaces of the banks 115L and 115R are provided. The turbochargers 10L, 10R are provided at a position lower than the oil level La of the oil pan 113 by sending the oil OL collected in the oil collecting tanks 121R, 121L to the oil pan 113 by the oil circulation pump 124. Can be arranged and the center of gravity of the vehicle body can be lowered.

  However, the oil recirculation pump 123 that sends out the oil OL collected in the oil collecting tanks 121R and 121L to the oil pan 113 is subject to the presence or absence of the oil OL collected in the oil collecting tanks 121R and 121L and the fluctuation of the oil amount. Regardless of the fact that the oil circulation pump 123 is always driven, the loss of driving energy of the oil circulation pump 123 is large, and the fuel consumption is reduced.

  In particular, when the oil circulating pump 123 is driven via a driving force transmission mechanism such as a timing chain by rotational driving of the crankshaft, the loss of transmission energy by the driving force transmission mechanism is relatively large and affects fuel consumption and engine performance. At the same time, a space occupied by the arrangement is required, and the arrangement position is restricted to restrict the design layout.

  On the other hand, when the oil recirculation pump 123 is configured by an electric pump that is driven by an electric motor, the influence on the fuel consumption and engine performance is relatively small, but the electric motor consumes a large amount of power and the electric motor is always continuous. Therefore, it is difficult to obtain sufficient durability of the electric motor due to wear of the brush and commutator of the electric motor, and periodic maintenance is required.

  Accordingly, an object of the present invention made in view of such a point is to provide a lubricating structure for a turbocharger that reduces the loss of drive energy of an oil circulation pump and is excellent in durability.

  The turbocharger lubrication structure according to claim 1, which achieves the above object, is characterized in that a turbocharger disposed in an engine body supplies oil from an oil reservoir to lubricate the turbocharger. In this lubricating structure, an oil collection tank disposed below the turbocharger and supplied with oil discharged from the turbocharger, and oil stored in the oil collection tank An oil recirculation pump for sending to the reservoir, and an oil amount sensor for detecting whether or not the oil stored in the oil collection tank is greater than or equal to a preset oil amount, wherein the oil amount sensor is the setting The oil recirculation pump is driven to detect the amount of oil or more, and the oil in the oil collection tank is sent to the oil reservoir.

  The invention of the turbocharger lubrication structure according to claim 2 that achieves the above object is provided with a turbocharger that supplies and lubricates oil from an oil reservoir to each of the turbochargers arranged in the engine body. In the lubrication structure of the turbocharger, a plurality of oil collection tanks respectively disposed below the turbochargers and supplied with oil discharged from the turbochargers, and the plurality of oil collection tanks A communication passage that communicates between any one of the specific oil collection tanks and the other oil collection tank, and an oil recirculation pump that sends the oil in the specific oil collection tank to the oil reservoir. An oil amount sensor that detects whether or not the oil stored in the specific oil collection tank is greater than or equal to a preset oil amount, and the oil amount sensor detects greater than or equal to the set oil amount Sometimes above oy By driving the perfusion pump oil in the specific oil collecting tank, characterized in that sending to the oil reservoir.

  According to a third aspect of the present invention, there is provided a lubricating structure for a turbocharger according to a third aspect of the present invention, wherein the turbochargers are arranged on the left and right banks of the horizontally opposed engine or V-shaped engine. In a turbocharger lubrication structure that supplies and lubricates oil from an oil reservoir to the turbocharger, oil that is disposed below each turbocharger and discharged from each turbocharger is supplied. Each oil collecting tank, a communication passage communicating between the oil collecting tanks, and an oil for sending the oil in any one of the oil collecting tanks to the oil reservoir A recirculation pump, and an oil amount sensor that detects whether or not the oil stored in the specific oil collection tank is equal to or greater than a preset oil amount, and the oil amount sensor is the set oil amount Check above Sometimes it drives the oil recirculation pump and wherein the sending the oil in the specific oil collecting tank to the oil reservoir.

  According to a fourth aspect of the present invention, in the lubricating structure for a turbocharger according to the second or third aspect, the oil is supplied from the specific oil collecting tank side to the other oil collecting tank side via the communication passage. A check valve for preventing movement is provided.

  According to a fifth aspect of the present invention, in the lubricating structure for a turbocharger according to any one of the second to fourth aspects, the specific oil collecting tank and the oil collecting tanks from the turbochargers. And a pressure adjusting passage communicating with an oil lubrication system passage portion having a pressure lower than the pressure of the turbo blow-by gas discharged.

  According to a sixth aspect of the present invention, in the lubricating structure for a turbocharger according to the fifth aspect, the low-pressure oil lubrication system path portion is a crankcase.

  The invention according to claim 7 is the lubrication structure of the turbocharger according to any one of claims 1 to 6, wherein the oil amount sensor detects the oil level of the oil stored in the oil collecting tank. It is the oil level sensor which performs.

  According to the invention of claim 1, the oil amount sensor for detecting the oil amount in the oil collecting tank for collecting the oil discharged from the turbocharger is provided, and the oil amount sensor is detected when the oil amount exceeds the set oil amount. Since the oil circulation pump is driven and the oil in the oil collection tank is sent to the oil reservoir, the drive of the oil circulation pump is controlled according to the amount of oil stored in the oil collection tank. Thus, the oil circulation pump is not continuously driven, and energy loss for driving the oil circulation pump can be greatly reduced. Furthermore, when the oil recirculation pump is operated by the rotation drive of the electric motor, the electric motor is driven to rotate as necessary, so that the wear of the brush, commutator, etc. of the electric motor is reduced and excellent durability can be secured. .

  According to the invention of claim 2, the amount of oil for detecting the amount of oil in a specific oil collection tank by communicating between the oil collection tanks for collecting the oil discharged from the plurality of turbochargers by the communication passage Each oil collection tank is equipped with a sensor, and when the oil level sensor detects an oil level exceeding the set level, the oil circulation pump is driven to send the oil in a specific oil collection tank to the oil reservoir. The oil collected in the oil can be sent to the oil reservoir by a single oil circulation pump. Furthermore, since the drive of the oil circulation pump is controlled according to the amount of oil stored in the oil collecting tank, the oil circulation pump is not continuously driven, and the oil circulation pump is driven. Energy loss can be greatly reduced. Furthermore, when the oil recirculation pump is operated by the rotation drive of the electric motor, the electric motor is driven to rotate as necessary, so that the wear of the brush, commutator, etc. of the electric motor is reduced and excellent durability can be secured. .

  According to the invention of claim 3, a plurality of turbochargers are provided by the oil supplied from the oil reservoir to each of the turbochargers disposed in the vertically opposed horizontally opposed engine or the V-shaped left and right banks. An oil level sensor that detects the amount of oil in one of the specified oil collection tanks by connecting each oil collection tank that collects oil discharged from each turbocharger through a communication passage When the oil level sensor detects that the oil level exceeds the set level, the oil circulating pump is driven and the oil in the specific oil collection tank is sent to the oil storage part. Oil can be delivered to the oil reservoir by a single oil circulation pump. In addition, since the drive of the oil circulation pump is controlled according to the amount of oil stored in a specific oil collection tank, the oil circulation pump is not continuously driven to rotate. Energy loss for driving can be greatly reduced. Furthermore, when the oil recirculation pump is operated by the rotational drive of the electric motor, the wear of the brush and commutator of the electric motor is reduced, and excellent durability can be ensured.

  According to the invention of claim 4, when a large lateral G occurs due to a sudden turning of the vehicle, the movement of oil from the specific oil collection tank side to the other oil collection tank side is prevented by the check valve. It is blocked and the influence on the function of the turbocharger can be suppressed.

  According to the invention of claim 5, a specific oil collecting tank is provided to the oil lubrication system passage portion having a pressure lower than the pressure of the turbo blow-by gas discharged from each turbocharger to each oil collecting tank. By communicating, the inside of each oil collection tank is pressurized by the turbo blow-by gas discharged from each turbocharger, while the inside of a specific oil collection tank is depressurized via a pressure adjustment passage to a specific The oil collection tank has a lower pressure than the other oil collection tanks. Due to this pressure difference, the oil in the other oil collection tank is pumped to a specific oil collection tank through the communication passage.

  The invention according to claim 6 specifies the lubrication system passage part as a crankcase, and easily secures the lubrication system path part having a pressure lower than the pressure of the turbo blow-by gas discharged from the turbocharger to the oil collecting tank. it can.

  According to the invention of claim 7, the oil amount sensor can be constituted by an inexpensive oil level sensor that detects the oil level of the oil stored in the oil collecting tank.

  Hereinafter, an embodiment of a lubricating structure for a turbocharger according to the present invention will be described with reference to the drawings, taking as an example a horizontally opposed engine for vehicles arranged vertically. Note that the turbochargers 10L and 10R in each embodiment have substantially the same configuration as the turbocharger 10 shown in FIG. 8, and a detailed description thereof will be omitted.

(First embodiment)
A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a partially sectional front view showing an outline of a horizontally opposed engine equipped with a turbocharger showing an outline of the present embodiment, FIG. 2 is an explanatory view schematically showing, and FIG. It is an oil system diagram.

  Left and right banks 23L and 23R are provided in a crankcase 22 disposed in the center of the engine body 21. An oil pan 25 serving as an oil storage portion is attached directly below the crankcase 22, and a pair of turbochargers 10L and 10R are disposed on the lower surfaces of the left and right banks 23L and 23R so as to be separated from each other. The turbochargers 10L and 10R are located below the oil level La of the oil OL in the oil pan 25.

  An oil pump 39 is disposed inside the engine body 21, and the oil OL in the oil pan 25 is sucked through the oil strainer 37 and the oil suction passage 38 on the suction side of the oil pump 39 and sucked by the oil pump 39. Oil OL is sent from the oil gallery in the engine main body 21 to each lubrication part, and part of the oil is branched and the oil inlets of the turbochargers 10L and 10R are used for lubricating and cooling the turbochargers 10L and 10R. An oil lubrication system path for feeding oil to 18a is formed.

  An oil outlet 18b that opens to the lower portion of the center housing 13 of the left turbocharger 10L communicates with the upper portion of the oil collecting tank 27L via the oil drain communication passage 26L. It communicates with the oil pan 25 through an oil recovery passage 29L through which a pump 28L is interposed. The oil recirculation pump 28L is constituted by an electric pump driven by an electric motor 28Lm.

  The oil collecting tank 27L is provided with an oil level sensor 31L that functions as an oil amount sensor that detects whether or not the oil OL stored in the oil collecting tank 27L is equal to or larger than a preset oil amount. When the oil level of the oil OL in the oil collecting tank 27L is equal to or higher than the set oil level L1, the oil level sensor 31L detects the oil level, and the changeover switch 32L is detected by a signal from the oil level sensor 31L. Is turned on and the electric motor 28Lm is rotationally driven to operate the oil recirculation pump 28L. Then, the oil OL in the oil collection tank 27L is sucked and sent to the oil pan 25. On the other hand, if the oil level of the oil OL in the oil collecting tank 27L is less than the oil level position L1 and not more than the preset oil level position L2, the oil level sensor 31L detects the oil level and the oil level sensor 31L. The changeover switch 32L is turned OFF by the signal from, the rotation drive of the electric motor 28Lm is stopped, and the oil feed to the oil pan 25 by the oil circulation pump 28L is stopped.

  Similarly, an oil outlet 18b that opens to the lower part of the center housing 13 of the right turbocharger 10R communicates with the upper part of the oil collecting tank 27R via the oil drain communication path 26R, and the lower part of the oil collecting tank 27R. Is communicated with the oil pan 25 via an oil recovery passage 29R through which an oil circulation pump 28R is interposed. The oil recirculation pump 28R is configured by a scavenging pump driven by an electric motor 28Rm.

  The oil collecting tank 27R is provided with an oil level sensor 31R that functions as an oil amount sensor that detects whether or not the oil OL stored in the oil collecting tank 27R is equal to or larger than a preset oil amount. When the oil level of the oil OL in the oil collecting tank 27R is equal to or higher than the set oil level L1, the oil level sensor 31R detects the oil level, and the changeover switch 32R is detected by a signal from the oil level sensor 31R. Is turned on and the electric motor 28Rm is rotationally driven, and the oil OL in the oil collecting tank 27R is sent to the oil pan 25 by the operation of the oil circulation pump 28R. On the other hand, when the oil level of the oil OL in the oil collecting tank 27R is less than the oil level position L1 and not more than the preset oil level position L2, the oil level sensor 31R detects the oil level and the oil level sensor 31R. The changeover switch 32R is turned OFF by the signal from, the rotation drive of the electric motor 28Rm is stopped, and the oil feed to the oil pan 25 by the oil circulation pump 28R is stopped.

  Similar to the oil collection tank 27L, the upper portion of the oil collection tank 27R communicates with the crankcase 22 that is always maintained at a positive pressure by a pressure adjustment pipe 34R serving as a pressure adjustment passage.

  Next, the oil supply to each part of the oil OL will be described with reference to the oil system diagram shown in FIG.

  When the engine is operated, an oil pump 39 disposed inside the engine body 21 is operated, and the oil OL in the oil pan 25 is sucked by the oil pump 39 through the oil strainer 37 and the oil suction passage 38. The oil OL sucked by the oil pump 39 is pumped to the oil cooler 40, the oil temperature is adjusted by the oil cooler 40, and the oil is fed from the oil gallery in the engine body 21 to the lubrication part.

  Specifically, the oil OL whose oil temperature has been optimized by the oil cooler 40 is guided to the left and right main gallery 41L and 41R on the crankcase 22 side. The oil OL supplied to the left main gallery 41L is fed to the crankshaft portion 43L disposed in the crankcase 22 to lubricate the crankshaft portion 43L as a lubricating portion, and branches from the main gallery 41L to the left side. The oil is fed to the valve operating mechanism 45L through the gallery 44L arranged in the cylinder head 24L of the bank 23L, and lubricates the valve operating mechanism 45L. The oil OL that has lubricated the crankshaft 43L and the valve operating mechanism 45L is collected in the oil pan 25.

  Further, the oil OL is supplied to the oil communication passage 47L through the gallery 46L branched from the gallery 44L in the cylinder head 24L. Here, the oil OL is sent from the gallery 46L to the oil inlet 18a of the left turbocharger 10L through the oil passage 47L.

  The oil OL supplied from the oil inlet 18a is sent to the turbine wheel side bearing 16a and the compressor wheel side bearing 16b through the oil supply passage 19 of the turbocharger 10L to lubricate the portion. The oil OL that has lubricated and cooled the turbine wheel side bearing 16a and the compressor wheel side bearing 16b is discharged from the oil outlet 18b that opens to the bottom of the center housing 13 to the oil collecting tank 27L through the oil drain communication passage 26L. It is collected in the collection tank 27L.

  Here, in the turbocharger 10 </ b> L, the air pressurized by the turbine wheel 14 in the turbine chamber 11 and the air pressurized by the compressor wheel 15 in the compressor chamber 12 are transmitted from the gap 20 a of the seal portion 20 through the center housing 13. It may leak out as turbo blow-by gas.

  On the other hand, when the oil level of the oil OL used for lubrication and cooling of the turbocharger 10L and collected and stored in the oil collection tank 27L becomes equal to or higher than the preset oil level position L1, the oil level is reduced. The liquid level sensor 31L detects it, the changeover switch 32L is turned on by a signal from the oil level sensor 31L, and the oil recirculation pump 28L is actuated by the rotational drive of the electric motor 28Lm, so that the oil OL in the oil collecting tank 27L becomes oil. It is sucked up by the recirculation pump 28L and sent out to the oil pan 25 through the oil recovery passage 29L.

  When the liquid level of the oil OL in the oil collecting tank 27L that is sent to the oil pan 25 by the oil circulation pump 28L becomes equal to or lower than the preset oil level position L2, the liquid level sensor 31L detects the oil level, The changeover switch 32L is turned off by the signal from the oil level sensor 31L, the rotation drive of the electric motor 28Lm is stopped, the operation of the oil recirculation pump 28L is stopped, and the oil circulation pump 28L moves from the oil collection tank 27L to the oil pan 25. Stops sending.

  Similarly, when the liquid level of the oil OL recovered and stored in the oil collecting tank 27L from the turbocharger 10L again becomes equal to or higher than the set oil level position L1, an oil level sensor 31L that detects the amount of oil is detected. The switch 32L is turned on by the signal from the motor to rotate the electric motor 28Lm, the oil circulation pump 28L is operated, the oil OL in the oil collection tank 27L is returned to the oil pan 25, and the oil collection tank 27L When the liquid level of the oil OL falls below the set oil level L2, the changeover switch 32L is turned off by the signal from the oil level sensor 31L detected by the liquid level sensor 31L, and the rotation of the electric motor 28Lm The driving is stopped, and oil delivery to the oil pan 25 by the oil circulation pump 28L is stopped.

  The oil OL supplied to the oil collecting tank 27L from the turbocharger 10L in this way is intermittently generated by the electric motor 28Lm according to the change in the oil amount of the oil OL stored in the oil collecting tank 27L. The oil is fed to the oil pan 25 by an oil circulation pump 28L driven by rotation.

  Here, according to the liquid level of the oil OL stored in the oil collection tank 27L, that is, the amount of oil in the oil collection tank 27L, the oil circulation pump 28L controls the delivery to the oil pan 25, and the oil collection The oil OL in the tank 27L is not emptied or excessively decreased, and the oil passage 29L is connected to the lower part of the oil collection tank 27L. Therefore, the turbo in the oil collection tank 27L is obtained by the oil circulation pump 28L. Inhalation of blow-by gas and air is suppressed. Further, the oil OL is held in the oil collecting tank 27L, and the turbo blowby gas and air mixed in the oil OL are separated in the oil collecting tank 28L. The oil OL with less mixing can be efficiently sent to the oil pan 25 by the oil circulation pump 28L.

  Further, since the upper portion of the oil collection tank 27L is communicated with the crankcase 22 that is always maintained at a positive pressure by the pressure adjustment pipe 34L, for example, the oil in the oil collection tank 27L is caused by traveling on a rough road or turning. Even if the oil level of the OL is disturbed or the oil OL is unevenly distributed, even if the oil circulation pump 28L sucks turbo blow-by gas or air in the oil collection tank 27L, the oil collection tank 27L and the turbocharger The inside of the 10 L center housing 13 does not become negative pressure, and significant generation of turbo blow-by gas is suppressed. If the pressure adjustment pipe 34L is not provided and the oil collection tank 27L has a small amount of oil OL, the oil recirculation pump 28L sucks up the air in the oil collection tank and the oil collection tank 27L and the turbocharger 10L. The inside of the center housing 13 becomes negative pressure, the pressure difference between the turbine chamber 11 and the compressor chamber 12 becomes large, and turbo blow-by gas is remarkably generated.

  The oil OL supplied to the right main gallery 41R is fed to the crankshaft portion 43R disposed in the crankcase 22 to lubricate the crankshaft portion 43R and branch from the main gallery 41R to branch into the right bank 23R. Oil is supplied to the valve operating mechanism 45R via the gallery 44R disposed in the cylinder head 24R, and the valve operating mechanism 45R is lubricated. The oil OL that has lubricated the crankshaft 43R and the valve operating mechanism 45R is collected in the oil pan 25.

  Further, the oil OL is supplied to the oil communication passage 47R through the gallery 46R branched from the gallery 44R in the cylinder head 24R. Here, the oil OL is sent from the gallery 46R to the oil inlet 18a of the turbocharger 10R on the right side through the oil passage 47R.

  The oil OL supplied from the oil inlet 18a is supplied to the turbine wheel side bearing 16a and the compressor wheel side bearing 16b through the oil supply passage 19 of the turbocharger 10R to lubricate the portion. The oil OL that has lubricated and cooled the turbine wheel side bearing 16a and the compressor wheel side bearing 16b is discharged from the oil outlet 18b that opens to the bottom of the center housing 13 to the oil collecting tank 27R through the oil drain communication passage 26R. It is collected in the collection tank 27R.

  On the other hand, when the oil level of the oil OL used for lubrication and cooling of the turbocharger 10R and recovered and stored in the oil collecting tank 27R becomes equal to or higher than a preset oil level position L1, the amount of oil is reduced. The level sensor 31R detects, the changeover switch 32R is turned on by a signal from the oil level sensor 31R, the oil recirculation pump 28R is actuated by the rotational drive of the electric motor 28Rm, and the oil OL in the oil collecting tank 27R becomes oil. It is sucked up by the recirculation pump 28R and returned to the oil pan 25 through the oil recovery passage 29R.

  When the oil level of the oil OL in the oil collecting tank 27R which is sent to the oil pan 25 by the oil circulation pump 28R becomes equal to or less than the set oil level L2, the oil level is detected by the liquid level sensor 31R. The changeover switch 32R is turned OFF by the signal from the surface sensor 31R, the rotation drive of the electric motor 28Rm is stopped, and the oil circulation pump 28R stops the delivery from the oil collecting tank 27R to the oil pan 25.

  Similarly, when the oil level of the oil OL recovered and stored in the oil collecting tank 27R from the turbocharger 10R becomes equal to or higher than the set oil level position L1, the oil level sensor 31R that detects the oil level is used. The changeover switch 32R is turned on by the signal of, and the oil OL in the oil collection tank 27R is returned to the oil pan 25 by the operation of the oil circulation pump 28R by the rotational drive of the electric motor 28Rm, and the oil in the oil collection tank 27R When the oil level of OL falls below the oil level L2, the changeover switch 32R is turned OFF by the signal from the oil level sensor 31R detected by the liquid level sensor 31R, and the rotational drive of the electric motor 28Rm is stopped and the oil The electric motor 28Rm is operated in accordance with the amount of oil OL stored in the oil collecting tank 27R when the circulating pump 28R is deactivated. Energization and interruption of are intermittently performed.

  Here, oil supply to the oil pan 25 by the oil circulation pump 28R is controlled according to the liquid level of the oil OL stored in the oil collection tank 27R, that is, the amount of oil in the oil collection tank 27R, and the oil collection The oil OL in the collection tank 27R is not empty or excessively reduced, and the oil passage 29R is connected to the lower part of the oil collection tank 27R. Inhalation of turbo blow-by gas and air is suppressed. Further, the oil OL is held in the oil collection tank 27R, and the turbo blowby gas and air mixed in the oil OL are separated in the oil collection tank 28R, so-called gas-liquid separation is performed, and the turbo blowby gas and air are relatively separated. The oil OL with less mixing can be efficiently sent to the oil pan 25 by the oil recirculation pump 28R.

  Therefore, according to the present embodiment configured as described above, the oil level sensors 31L and 31R that detect the oil level in the oil collecting tanks 27L and 27R that collect the oil discharged from the turbochargers 10L and 10R. The oil level sensors 31L and 31R rotate the electric motors 28Lm and 28Rm when the oil level is detected to be greater than the set oil level, and the oil circulating tanks 28L and 28R cause the oil in the oil collection tanks 27L and 27R to be supplied to the oil pan 25 Therefore, the electric motors 28Lm and 28Rm are driven to rotate as needed and are not always driven to rotate, and the power consumption for driving the oil circulation pumps 28L and 28R is suppressed, resulting in energy loss. It can be greatly reduced.

  Furthermore, since the electric motors 28Lm and 28Rm operate as necessary, the wear of the brushes and commutators of the electric motors 28Lm and 28Rm is greatly reduced to ensure the excellent durability of the electric motors 28Lm and 28Rm. This can simplify the maintenance.

  The operation of the changeover switches 32L, 32R, the electric motors 28Lm, 28Rm and the like is performed by an in-vehicle engine control device (ECU) based on ON / OFF switching of the changeover switches 32L, 32R and the rotational drive state of the electric motors 28Lm, 28Rm. By comparing the above, it is possible to diagnose the operating state of the oil circulation pumps 28L, 28R, etc. by the changeover switches 32L, 32R, the electric motors 28Lm, 28Rm.

(Second Embodiment)
A second embodiment of the present invention will be described with reference to FIGS. FIG. 4 is a partially sectional front view showing an outline of a horizontally opposed engine equipped with a turbocharger showing an outline of the present embodiment, FIG. 5 is an explanatory view schematically showing, and FIG. It is an oil system diagram. 4 to 6, parts corresponding to those in FIGS. 1 to 3 are given the same reference numerals as those in FIGS. 1 to 3, and detailed descriptions thereof are omitted, and different parts are mainly described. .

  In this embodiment, the left and right oil collection tanks 27L and 27R in the first embodiment communicate with the lower portions of the side surfaces on the center side in the vehicle width direction through the communication passage 35, and the right oil collection tank 27R side. The oil recovery passage 29R, the oil recirculation pump 28R including the electric motor 28Rm, the liquid level sensor 31R, the changeover switch 32R, and the pressure adjustment pipe 34R are omitted, and the configuration is simplified. Is configured in the same manner as in the first embodiment.

  The oil supply to each part of the oil OL will be described with reference to the oil system diagram shown in FIG. Similar to the first embodiment, the operation of the oil pump 39 disposed inside the engine body 21 by the operation of the engine causes the oil OL in the oil pan 25 to be sucked and the oil cooler 40 to optimize the oil temperature. To the left and right main galleries 41L and 41R on the crankcase 22 side.

  The oil OL supplied to the left main gallery 41L lubricates the crankshaft 43L, branches off from the main gallery 41L, and is sent to the valve mechanism 45L via the gallery 44L to lubricate the valve mechanism 45L. And collected in the oil pan 25. Further, the oil OL is supplied to the oil communication passage 47L through the gallery 46L branched from the gallery 44L in the cylinder head 24L, and the turbocharger 10L is supplied from the oil inlet 18a of the left turbocharger 10L through the oil passage 47L. The oil OL lubricated and cooled the turbine wheel side bearing 16a and the compressor wheel side bearing 16b is discharged from the oil outlet 18b to the oil collecting tank 27L through the oil drain communication path 26L.

  The oil OL supplied to the right main gallery 41R lubricates the crankshaft 43R, branches from the main gallery 41R, and operates through a gallery 44R disposed in the cylinder head 24R of the right bank 23R via the valve train mechanism 45R. And is collected in the oil pan 25. Further, oil OL is supplied to the oil communication passage 47R through the gallery 46R branched from the gallery 44R in the cylinder head 24R, and the turbocharger 10L is supplied from the oil inlet 18a of the right turbocharger 10R through the oil passage 47R. The oil OL lubricated and cooled by the turbine wheel side bearing 16a and the compressor wheel side bearing 16b is recovered from the oil outlet 18b to the right oil collecting tank 27R through the oil drain communication passage 26R.

  Here, in the left and right turbochargers 10 </ b> L and 10 </ b> R, the air pressurized by the turbine wheel 14 in each turbine chamber 11 and the air pressurized by the compressor wheel 15 in the compressor 12 chamber are separated by a gap 20 a between the seal portions 20. The turbo blow-by gas leaking into the center housing 13 has a high pressure, and is discharged from the oil drain communication passages 26L and 26R into the left and right oil collection tanks 27L and 27R at a high pressure, and the oil collection tanks 27L and 27R. Pressurize the inside. On the other hand, in the left oil collection tank 27L, which is a specific oil collection tank, an oil lubrication system having a pressure lower than the discharge pressure of the turbo blow-by gas discharged from the oil drain communication passages 26L, 26R to the oil collection tanks 27L, 27R. The pressure adjustment pipe 34L communicates with the crankcase 22 that is a portion of the road to reduce the pressure, and the pressure in the left oil collection tank 27L is lower than that in the right oil collection tank 27R that is the other oil collection tank. It becomes.

  Due to the pressure difference between the internal pressure of the right oil collection tank 27R and the internal pressure of the left oil collection tank 27L, the oil OL and blow-by gas in the right oil collection tank 27R are connected to the left oil via the communication passage 35. Sequentially pumped to the collection tank 27L side.

  The oil OL and turbo blow-by gas pumped from the right oil collection tank 27R to the left oil collection tank 27L and the oil and turbo blow-by gas supplied from the turbocharger 10L to the oil collection tank 27L are And the turbo blow-by gas is supplied into the crankcase 22 through the pressure adjusting pipe 34L from the upper part of the oil collecting tank 27L.

  On the other hand, when the oil level of the oil OL collected and stored in the oil collecting tank 27L from the right oil collecting tank 27R and the left turbocharger 10L side becomes equal to or higher than a preset oil level position L1, The oil level is detected by the liquid level sensor 31L, the changeover switch 32L is turned on by a signal from the oil level sensor 31L, and the oil recirculation pump 28L is operated by the rotational drive of the electric motor 28Lm. The oil OL is sucked up by the oil circulation pump 28L and sent to the oil pan 25.

  When the oil level in the oil collecting tank 27L is fed to the oil pan 25 by the oil circulation pump 28L and the level of the oil OL is equal to or lower than the set oil level L2, the liquid level sensor 31L detects the oil level, The changeover switch 32L is turned off by the signal from the oil level sensor 31L, the rotation drive of the electric motor 28Lm is stopped, the operation of the oil recirculation pump 28L is stopped, and the oil circulation pump 28L moves from the oil collection tank 27L to the oil pan 25. Stops sending.

  Similarly, when the liquid level of the oil OL recovered and stored in the oil collecting tank 27L from the right oil collecting tank 27R and the turbocharger 10L again becomes the oil level position L1 or more, the amount of oil is detected. In response to the signal from the oil level sensor 31L, the changeover switch 32L is turned ON to rotate the electric motor 28Lm, the oil recirculation pump 28L is activated, and the oil OL in the oil collecting tank 27L is returned to the oil pan 25; When the level of the oil OL in the oil collecting tank 27L becomes equal to or lower than the set oil level L2, the changeover switch 32L is turned off by the signal from the oil level sensor 31L that detects the oil level, and the electric motor 28Lm The energization is stopped and the oil circulation pump 28L stops the delivery from the oil collection tank 27L to the oil pan 25.

  The oil OL supplied to the oil collecting tank 27L from the right oil collecting tank 27R and the turbocharger 10L in this way is in accordance with the fluctuation of the oil amount of the oil OL stored in the oil collecting tank 27L. The oil circulation pump 28L is intermittently driven by the electric motor 28Lm, and is sent to the oil pan 25.

  Here, oil feeding to the oil pan 25 is controlled by the oil recirculation pump 28L according to the level of the oil OL stored in the oil collecting tank 27L, that is, the amount of oil in the oil collecting tank 27L. The oil OL in the collection tank 27L is not emptied or excessively reduced, and the oil circulation pump 28L suppresses the intake of turbo blow-by gas and air in the oil collection tank 27L. Further, the oil OL is held in the oil collecting tank 27L, and the turbo blowby gas and air mixed in the oil OL are separated in the oil collecting tank 28L, so that the oil is relatively less mixed with the turbo blowby gas and air. The OL can be efficiently sent to the oil pan 25 by the oil circulation pump 28L.

  Further, since the upper portion of the oil collection tank 27L is communicated with the crankcase 22 that is always maintained at a positive pressure by the pressure adjustment pipe 34L, for example, the oil in the oil collection tank 27L is caused by traveling on a rough road or turning. Even if the oil level of the OL is disturbed or the oil OL is unevenly distributed, even if the oil circulation pump 28L sucks turbo blow-by gas or air in the oil collection tank 27L, the oil collection tank 27L and the turbocharger The inside of the 10 L center housing 13 does not become negative pressure, and significant generation of turbo blow-by gas is suppressed.

  Further, even when a lateral G is generated due to turning or the like, the oil OL moving from the oil collecting tank inside the turning to the oil collecting tank outside the turning through the communication passage 35 is greatly reduced, and the oil outside the turning is reduced. An excessive increase in the oil OL in the collection tank can be avoided or suppressed, and the influence on the function of the turbocharger can be suppressed.

  That is, for example, in the situation where a lateral G acting in the right direction is generated during left turn, the oil OL in the right oil collection tank 27R is equal to the internal pressure of the oil collection tank 27R and the oil collection tank. Due to the pressure difference of the internal pressure of 27L, the amount of oil sent to the left oil collecting tank 27L side is extremely small and obstruction of the discharge of oil OL and turbo blow-by gas from the turbocharger 10R is avoided. The influence on the turbocharger 10R can be suppressed.

  On the other hand, the oil OL in the oil collecting tank 27L on the left side is sent out by the oil circulation pump 28L and remains excessively even in a situation where a lateral G acting in the left direction occurs during the right turn. There is no hindrance to the discharge of oil OL and turbo blow-by gas from the turbocharger due to the oil OL remaining in the oil collecting tank 27L, and the influence on the turbocharger 10L can be suppressed.

  Therefore, by connecting the left and right oil collection tanks 27R and 27L through the communication passage 35, the oil circulation including the oil passage 29R and the electric motor 28Rm disposed on the right oil collection tank 27R side in the first embodiment. The pump 28R, the liquid level sensor 31R, the changeover switch 32R, and the pressure adjustment pipe 34R can be omitted, and the structure can be simplified as compared with the first embodiment, and the manufacturing cost can be expected to be reduced. Further, compared with the case where two oil circulation pumps 28L and 28R are arranged, the occupied space by the arrangement of the oil circulation pump is small, and the degree of freedom of design in the engine chamber can be secured.

  Further, similarly to the first embodiment, an oil level sensor 31L that detects the oil level in the oil collecting tank 27L that collects oil discharged from the turbocharger 10L is provided, and the oil level sensor 31L is set. The electric motor 28Lm is rotated at the time of detection of the oil amount or more, and the oil in the oil collection tank 27L is sent to the oil pan 25 by the oil circulation pump 28L. Therefore, the electric motor 28Lm is rotated as necessary. Without constantly rotating, the power consumption for driving the oil circulation pump 28L is suppressed, and energy loss can be greatly reduced.

  Further, since the electric motor 28Lm operates as necessary, wear of the brush, commutator, etc. of the electric motor 28Lm can be reduced, and excellent durability of the electric motor 28Lm can be ensured, resulting in simplified maintenance. It is done.

  In the present embodiment, an oil recirculation pump 28L including an electric motor 28Lm, an oil level sensor 31L, a changeover switch 32L, a pressure adjustment pipe 34L communicating with the crankcase 22 and the like are disposed on the left oil collection tank 27L side. However, instead of these, an oil recirculation pump 28R including an electric motor 28Rm, an oil level sensor 31R, a changeover switch 32R, a pressure adjusting pipe 34R communicating with the crankcase 22 and the like may be arranged on the right oil collecting pump 27R side. it can.

(Third embodiment)
With reference to FIG. 7, a third embodiment of the lubricating structure for a turbocharger according to the present invention will be described.

  FIG. 7 is a schematic diagram corresponding to FIG. 5, and the same reference numerals are given to the portions corresponding to FIG. In the communication passage 35 that communicates 27L and 27R, the movement of the oil OL from the oil collection tank 27L side to the oil collection tank 27R side is prevented, while the oil collection tank 22R side to the oil collection tank 27L side is prevented. A check valve 36 that allows the movement of the oil OL is arranged.

  According to the present embodiment, the oil OL and blow-by gas from the left and right turbochargers 10L, 10R are discharged to the left and right oil collection tanks 27L, 27R as in the second embodiment, and the oil collection tank. While the insides of 27L and 27R are pressurized, the inside of the left oil collecting tank 27L is communicated with the crankcase 22 by the pressure adjusting pipe 34L and becomes a low pressure with respect to the right oil collecting tank 27R.

  Oil OL and turbo blow-by gas sent from the right oil collecting tank 27R to the left oil collecting tank 27L through the communication passage 35 and the check valve 36 due to the pressure difference between the oil collecting tanks 27R and 27L. Then, the oil discharged from the turbocharger 10L and the turbo blow-by gas gather in one oil collection tank 27L, and the turbo blow-by gas enters the crankcase 22 from the upper part of the oil collection tank 27L via the pressure adjustment pipe 34L. Is sent out.

  On the other hand, when the oil level of the oil OL collected and stored in the oil collecting tank 27L becomes equal to or higher than the preset oil level position L1, the oil level is detected by the liquid level sensor 31L and the changeover switch 32L is turned on. Then, the oil OL in the oil collection tank 27L is sucked up and returned to the oil pan 25 by the operation of the oil circulation pump 28L by the rotation drive of the electric motor 28Lm. Also, when the oil level in the oil collecting tank 27L is fed to the oil pan 25 by the oil recirculation pump 28L and becomes lower than the oil level position L2, the liquid level sensor 31L detects the oil level and switches the oil level. The switch 32L is turned OFF, the rotation drive of the electric motor 28Lm is stopped, the operation of the oil circulation pump 28L is stopped, and the delivery from the oil collecting tank 27L to the oil pan 25 is stopped.

  In this manner, the oil circulation pump 28L is intermittently driven by the electric motor 28Lm according to the fluctuation of the oil amount of the oil OL stored in the oil collection tank 27L, and is sent to the oil pan 25 for oil collection. The oil OL remaining in the collection tank 27L does not become excessive or too small.

  Therefore, in particular, due to a sudden left turn or the like, a lateral force greater than the pressure feeding force that is pumped from the oil collecting tank 27R side to the oil collecting tank 27L via the communication passage 35 due to the pressure difference between the oil collecting tanks 27R and 27L. Under the situation where G occurs, the check valve 36 prevents the oil OL in the left oil collection tank 27L from moving toward the right oil collection tank 27R, and the turbocharger 10R This prevents the oil OL and the turbo blow-by gas from being discharged, thereby suppressing the influence on the turbocharger 10R and maintaining the function of the turbocharger 10R. On the other hand, the oil OL in the oil collecting tank 27L on the left side is sent out by the oil circulation pump 28L and remains excessively even under a situation where an excessive lateral G is generated due to a sudden right turn. Without obstructing the discharge of the oil OL and turbo blow-by gas from the turbocharger due to the oil OL remaining in the remaining oil collecting tank 27L, and the influence on the turbocharger 10L is avoided. Can be suppressed. Therefore, in addition to the second embodiment, a reliable function of the turbochargers 10R and 10L can be ensured even when a larger lateral G acts.

  Furthermore, since the movement of the oil OL from the oil collecting tank 27L side to the oil collecting tank 27R side is suppressed, the capacity of the left and right oil collecting tanks 27L, 27R can be further reduced to achieve a compact size. it can.

  In the present embodiment, an oil recirculation pump 28L including an electric motor 28Lm, an oil level sensor 31L, a changeover switch 32L, a pressure adjustment pipe 34L communicating with the crankcase 22 and the like are disposed on the left oil collection tank 27L side. However, instead of these, an oil recirculation pump 28R including an electric motor 28Rm, an oil level sensor 31R, a changeover switch 32R, a pressure adjusting pipe 34R communicating with the crankcase 22 and the like may be arranged on the right oil collecting pump 27R side. it can. In this case, the check valve 36 disposed in the communication passage 35 prevents the movement of the oil OL from the oil collecting tank 27R side to the oil collecting tank 27L side, and the oil collecting tank L side receives the oil collecting tank L side. A check valve that allows the movement of the oil OL toward the collection tank 27R is disposed.

  In addition, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the meaning of invention. For example, the horizontal opposed engine provided with the turbocharger has been described as an example in the above embodiment, but the present invention can also be applied to a V-type engine provided with a turbocharger or other types of engines. In addition, the oil collecting pump is driven by an electric motor. However, a mechanical pump can be used as long as the pump can be switched between driving and stopping according to the amount of oil in the oil collecting tank. There may be.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial cross-sectional front view showing an outline of a horizontally opposed engine equipped with a turbocharger showing an outline of a first embodiment of a turbocharger lubrication structure according to the present invention. Similarly, it is explanatory drawing shown typically. Similarly, it is an oil system diagram. It is a partial cross section front view which shows the outline of the horizontally opposed engine with which the turbocharger which shows the outline | summary of 2nd Embodiment of this invention was mounted | worn. Similarly, it is explanatory drawing shown typically. Similarly, it is an oil system diagram. It is explanatory drawing which shows typically the outline of the horizontally opposed engine equipped with the turbocharger which shows the outline | summary of 3rd Embodiment of this invention. It is explanatory drawing of a turbocharger. It is explanatory drawing of the oil seal part used for a turbocharger. It is explanatory drawing which shows the outline of the horizontally opposed engine equipped with the conventional turbocharger.

Explanation of symbols

10L, 10R Turbocharger 21 Engine body 22 Crankcase 23L, 23R Bank 25 Oil pan (oil storage part)
27L, 27R Oil collection tanks 28L, 28R Oil recirculation pumps 29L, 29R Oil recovery passages 28Lm, 28Rm Electric motors 31L, 31R Oil level sensors (oil quantity sensors)
32L, 32R selector switch 34L, 34R Pressure adjustment pipe (pressure adjustment passage)
35 Communication passage 36 Check valve 39 Oil pump OL Oil L1, L2 Set oil level

Claims (7)

In the turbocharger lubrication structure that supplies and lubricates oil from the oil reservoir to the turbocharger arranged in the engine body,
An oil collecting tank disposed below the turbocharger and supplied with oil discharged from the turbocharger;
An oil recirculation pump that delivers oil stored in the oil collection tank to the oil storage unit;
An oil amount sensor that detects whether or not the oil stored in the oil collection tank is greater than or equal to a preset oil amount;
Lubricating a turbocharger, wherein the oil flow sensor drives the oil circulation pump to send the oil in the oil collecting tank to the oil reservoir when the oil amount sensor detects the oil amount greater than the set oil amount. Construction. In the turbocharger lubrication structure that supplies oil from the oil reservoir to lubricate each turbocharger arranged in the engine body,
A plurality of oil collection tanks respectively disposed below the turbochargers and supplied with oil discharged from each turbocharger;
A communication passage communicating between any one of the plurality of oil collection tanks and the other oil collection tank;
An oil recirculation pump for sending the oil in the specific oil collection tank to the oil reservoir;
An oil amount sensor that detects whether or not the oil stored in the specific oil collection tank is greater than or equal to a preset oil amount;
A turbocharger characterized in that when the oil amount sensor detects an oil amount that is greater than or equal to the set oil amount, the oil circulation pump is driven to send the oil in the specific oil collection tank to the oil reservoir. Lubrication structure. Lubricating a turbocharger that supplies and lubricates oil from an oil reservoir to each turbocharger disposed on the lower surfaces of the left and right banks of a horizontally opposed engine or a V-shaped engine arranged vertically. In structure
Each oil collection tank that is disposed below each turbocharger and is supplied with oil discharged from each turbocharger;
A communication passage communicating between the oil collection tanks;
An oil recirculation pump for sending the oil in any one of the oil collection tanks to the oil reservoir;
An oil amount sensor that detects whether or not the oil stored in the specific oil collection tank is greater than or equal to a preset oil amount;
A turbocharger characterized in that when the oil amount sensor detects an oil amount greater than the set oil amount, an oil circulation pump is driven to send oil in the specific oil collection tank to the oil reservoir. Lubrication structure.   4. The turbo according to claim 2, further comprising a check valve that prevents movement of oil from the specific oil collection tank side to the other oil collection tank side through the communication passage. 5. Supercharger lubrication structure.   A pressure adjusting passage that communicates between the specific oil collecting tank and an oil lubrication system passage portion having a pressure lower than the pressure of the turbo blow-by gas discharged from each turbocharger to each oil collecting tank. The lubrication structure for a turbocharger according to any one of claims 2 to 4, wherein the lubrication structure is a turbocharger.   6. The turbocharger lubricating structure according to claim 5, wherein the low-pressure oil lubrication system path portion is a crankcase. The turbocharger according to any one of claims 1 to 6, wherein the oil amount sensor is an oil level sensor that detects an oil level of oil stored in an oil collecting tank. Lubrication structure.

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