Patent Description:
The temperature of lubricant oil at a lubricant oil outlet of a turbocharger is one parameter that can monitor the state of bearings of the turbocharger. For this reason, conventionally, a thermometer is often installed at the lubricant oil outlet of the turbocharger to measure the temperature of lubricant oil (see Patent Document <NUM>, for example).

In this case, conventionally, a temperature sensor of the thermometer is placed in an oil outlet pipe for discharging lubricant oil from the turbocharger to measure the temperature of lubricant oil in the oil outlet pipe.

<CIT> discloses features falling under the preamble of claim <NUM>.

Since the oil outlet pipe of the turbocharger discharges mist air in a bearing pedestal of the turbocharger together with the lubricant oil, the cross-sectional area of the oil outlet pipe is sized to discharge the air layer and oil layer even at the maximum lubricant oil flow rate. The flow rate of lubricant oil flowing through the turbocharger depends on the rotation speed of the turbocharger, temperature of the lubricant oil, pressure of the lubricant oil, and characteristics of the lubricant oil, etc. If the back pressure downstream of the oil outlet pipe is high, the flow rate of lubricant oil is not constant and may move like pulsation. When the thermometer in the oil outlet pipe is affected by these various factors and comes into contact not only with oil but also with air (when the pipe is not oil-tight), the temperature measured by the thermometer becomes unstable, resulting in a reduction in measurement accuracy.

In view of the above, an object of the present disclosure is to provide a turbocharger that can accurately measure the outlet temperature of lubricant oil.

According to the present disclosure, it is possible to provide a turbocharger that can accurately measure the outlet temperature of lubricant oil.

Embodiments of the present disclosure will be described below with reference to the accompanying drawings. It is intended, however, that unless particularly identified, dimensions, materials, shapes, relative positions and the like of components described or shown in the drawings as the embodiments shall be interpreted as illustrative only and not intended to limit the scope of the present invention.

For instance, an expression of relative or absolute arrangement such as "in a direction", "along a direction", "parallel", "orthogonal", "centered", "concentric" and "coaxial" shall not be construed as indicating only the arrangement in a strict literal sense, but also includes a state where the arrangement is relatively displaced by a tolerance, whereby it is possible to achieve the same function.

For instance, an expression of an equal state such as "same" "equal" and "uniform" shall not be construed as indicating only the state in which the feature is strictly equal, but also includes a state in which there is a tolerance that can still achieve the same function.

<FIG> is a cross-sectional view showing a schematic configuration of a turbocharger <NUM> according to an embodiment, which shows a cross-section along the rotational axis C of a shaft <NUM> of the turbocharger <NUM>.

As shown in <FIG>, the turbocharger <NUM> includes a turbine <NUM>, a compressor <NUM>, and a bearing device <NUM>.

The turbine <NUM> includes a turbine wheel <NUM>, and a turbine casing <NUM> for accommodating the turbine wheel <NUM>.

The compressor <NUM> includes a compressor impeller <NUM>, and a compressor casing <NUM> for accommodating the compressor impeller <NUM>. The turbine wheel <NUM> and the compressor impeller <NUM> are connected by a shaft <NUM> and share the shaft <NUM>. Therefore, the turbine wheel <NUM> and the compressor impeller <NUM> are configured to rotate integrally around the rotational axis C. As the turbine wheel <NUM> is rotated by exhaust gas supplied from an engine (not shown), the compressor impeller <NUM> rotates to compress the air and discharges the compressed air. Hereinafter, unless otherwise stated, the axial direction of the shaft <NUM> is referred to as simply "axial direction", and the radial direction of the shaft <NUM> is referred to as simply "radial direction", and the circumferential direction of the shaft <NUM> is referred to as simply "circumferential direction".

The bearing device <NUM> includes journal bearings <NUM>, <NUM> which rotatably support the shaft <NUM>, a thrust bearing <NUM> which restricts axial movement of the shaft <NUM>, and a bearing pedestal <NUM> (bearing casing) which accommodates the journal bearings <NUM>, <NUM> and the thrust bearing <NUM>. In the illustrated example, the thrust bearing <NUM>, the journal bearing <NUM>, and the journal bearing <NUM> are arranged in order from the compressor impeller <NUM> in the axial direction.

The bearing pedestal <NUM> includes a lubricant oil receiving part <NUM> having a lubricant oil inlet <NUM> for receiving lubricant oil from the outside of the bearing pedestal <NUM> to the inside of the bearing pedestal <NUM>, and a lubricant oil discharge part <NUM> having a lubricant oil outlet <NUM> for discharging lubricant oil from the inside of the bearing pedestal <NUM> to the outside of bearing pedestal <NUM>, and supports the bearing <NUM>. In the lubricant oil discharge part <NUM>, lubricant oil is stored as will be described later, and an oil level <NUM> of the lubricant oil is formed. In the illustrated example, the lubricant oil inlet <NUM> is formed at the top of the bearing pedestal <NUM>, and the lubricant oil outlet <NUM> is formed at the bottom of the bearing pedestal <NUM>.

The lubricant oil inlet <NUM> and the lubricant oil outlet <NUM> are communicated through the interior space of the bearing pedestal <NUM>. At least part of the lubricant oil entering the interior space of the bearing pedestal <NUM> from the lubricant oil inlet <NUM> is supplied to the journal bearing <NUM>, the journal bearing <NUM>, or the thrust bearing <NUM> to reduce friction with the shaft <NUM>, and then is discharged from the lubricant oil outlet <NUM> through a cavity <NUM> formed in the bearing pedestal <NUM> below the shaft <NUM>.

<FIG> is a schematic cross-sectional view showing a configuration example in the vicinity of the lubricant oil discharge part <NUM> in <FIG>.

As shown in <FIG>, the lubricant oil discharge part <NUM> of the bearing pedestal <NUM> includes a lubricant oil storage part <NUM> for storing the lubricant oil. Further, the turbocharger <NUM> includes a thermometer <NUM>. The thermometer <NUM> includes a probe <NUM>, and the tip of the probe <NUM> is provided with a temperature sensor <NUM> (temperature sensing element) for measuring the temperature of the lubricant oil.

The thermometer <NUM> may be, for example, an electric oil thermometer, which converts lubricant oil temperature information into an electric signal via a conductive wire (not shown) connected to the temperature sensor <NUM>. The probe <NUM> of the thermometer <NUM> is inserted into the lubricant oil storage part <NUM> through a mounting hole <NUM> formed in a bottom lid <NUM>, which will be described later. At least a part of the temperature sensor <NUM> of the thermometer <NUM> is disposed in the lubricant oil storage part <NUM>. The tip of the probe <NUM> is disposed below the oil level <NUM> of the lubricant oil stored in the lubricant oil storage part <NUM>, so the temperature sensor <NUM> of the thermometer <NUM> is disposed below the oil level <NUM> of the lubricant stored in the lubricant oil storage part <NUM>. An annular seal member <NUM> may be provided between the inner peripheral surface of the mounting hole <NUM> and the outer peripheral surface of the probe <NUM> to suppress leakage of the lubricant oil. The seal member <NUM> may be, for example, a tapered thread (a tapered airtight thread).

The lubricant oil discharge part <NUM> includes a casing part <NUM> of substantially cylindrical shape which forms the cavity <NUM> along the vertical direction below the shaft <NUM> (see <FIG>), and a bottom lid <NUM> (the bottom wall of the lubricant oil discharge part <NUM>) which covers an opening formed at the lower end of the casing part <NUM>. The lubricant oil storage part <NUM> includes a protruding pipe <NUM> that protrudes upward from an upper surface <NUM> of the bottom lid <NUM>. The protruding pipe <NUM> is connected from above to the lubricant oil outlet <NUM> formed in the bottom lid <NUM> and protrudes upward from the lubricant oil outlet <NUM>.

The lubricant oil storage part <NUM> is configured to store lubricant oil between an outer peripheral surface <NUM> of the protruding pipe <NUM> and an inner peripheral surface <NUM> of the lubricant oil discharge part <NUM>. More specifically, the lubricant oil storage part <NUM> is an annular recess <NUM> formed by the outer peripheral surface <NUM> of the protruding pipe <NUM>, the inner peripheral surface <NUM> of the casing part <NUM>, and the upper surface <NUM> of the bottom lid <NUM>, and is configured to store lubricant oil in the annular recess <NUM>. The temperature sensor <NUM> at the tip of the probe <NUM> is disposed in the annular recess <NUM>. In the illustrated example, the tip of the probe <NUM> is disposed below the tip of the protruding pipe <NUM> (the upper end of the protruding pipe <NUM>) so that the tip of the probe <NUM> is below the oil level <NUM>. The recess <NUM> needs not be annular. In other words, the cross-section of the outer peripheral surface <NUM> and the cross-section of the inner peripheral surface <NUM> need not be circular, but may be other shapes, such as a rectangle (square), for example.

As shown in <FIG>, the lubricant oil storage part <NUM> includes a plurality of oil drain holes <NUM> for discharging the lubricant oil from the lubricant oil storage part <NUM> to the lubricant oil outlet <NUM>. Each of the oil drain holes <NUM> penetrates a wall surface <NUM> of the protruding pipe <NUM>. The plurality of oil drain holes <NUM> includes a plurality of lower oil drain holes 56A provided in a lower portion <NUM> of the protruding pipe <NUM>. The lower oil drain holes 56A are arranged at intervals in the circumferential direction of the protruding pipe <NUM>, and each of the lower oil drain holes 56A penetrates the wall surface <NUM> of the protruding pipe <NUM>. The number of lower oil drain holes 56A formed in the protruding pipe <NUM> is not particularly limited. For example, a total of four lower oil drain holes 56A may be provided in the protruding pipe <NUM> at intervals of <NUM> degrees.

In the example shown in <FIG>, a flange <NUM> is disposed on a lower surface of a bottom lid <NUM> for connecting a flange <NUM> of an oil outlet pipe <NUM>, and the flange <NUM> at the bottom lid <NUM> and the flange <NUM> at the oil outlet pipe <NUM> are connected by a plurality of bolts <NUM>. The lubricant oil stored in the lubricant oil storage part <NUM> is discharged to the oil outlet pipe <NUM> via the lower oil drain holes 56A, the inside of the protruding pipe <NUM>, and the lubricant oil outlet <NUM>.

With the configuration shown in <FIG>, since the temperature sensor <NUM> is disposed in the lubricant oil storage part <NUM>, the lubricant oil stored in the lubricant oil storage part <NUM> prevents the temperature sensor <NUM> from being exposed to air. In other words, the temperature sensor <NUM> can be placed in an oil-tight condition. Thus, the outlet temperature of the lubricant oil in the turbocharger <NUM> can be measured stably and accurately. Further, with the lubricant oil storage part <NUM>, the lubricant oil falls once and mixes in the lubricant oil storage part <NUM>, equalizing the temperature of the entire lubricant oil to some extent. Therefore, unevenness in the temperature of the lubricant oil measured by the temperature sensor <NUM> can be suppressed, and the average temperature of the lubricant oil can be measured. For example, the temperature of the lubricant oil discharged from the turbine-side bearing <NUM> tends to be higher than the temperature of the lubricant oil discharged from the compressor-side bearings <NUM>, <NUM>, but even in such cases, the average temperature of the lubricant oil can be measured since the lubricant oil mixes in the lubricant oil storage part <NUM>.

Further, as described above, by providing the lower oil drain holes 56A in the lower portion <NUM> of the protruding pipe <NUM>, gravity can be used to effectively promote the replacement of the lubricant oil in the lubricant oil storage part <NUM>. Therefore, it is possible to accurately measure the temperature of the lubricant oil which reflects the state of the journal bearings <NUM>, <NUM> and the thrust bearing <NUM> of the turbocharger <NUM> well with a simple configuration.

In the example shown in <FIG>, the plurality of lower oil drain holes 56A includes a plurality of lower end oil drain holes 56A1 provided at a lower end <NUM> of the protruding pipe <NUM>. The lower end oil drain holes 56A1 are arranged at intervals in the circumferential direction of the protruding pipe <NUM>, and each of the lower end oil drain holes 56A1 penetrates the wall surface <NUM> of the protruding pipe <NUM>.

Thus, by providing the lower end oil drain holes 56A1 at the lower end <NUM> of the protruding pipe <NUM>, the lubricant oil in the lubricant oil storage part <NUM> can be discharged through the lower end oil drain holes 56A1 when the operation of the turbocharger <NUM> is stopped, reducing residual lubricant oil in the lubricant oil storage part <NUM> when the operation of the turbocharger <NUM> is stopped. Therefore, when removing the bottom lid <NUM> from the lubricant oil storage part <NUM>, it is possible to reduce the outflow of oil from the lubricant oil storage part <NUM>. In addition to when removing the bottom lid <NUM>, for example, when removing (replacing) the temperature sensor <NUM> or transporting the turbocharger <NUM>, it is possible to reduce the outflow of oil from the lubricant oil storage part <NUM>.

If the lower oil drain holes 56A are not provided at the lower end <NUM> of the protruding pipe <NUM>, old lubricant oil may remain at the bottom of the lubricant oil storage part <NUM>. If old lubricant oil remains at the bottom, there is a concern that the accuracy of lubricant oil temperature measurement will be reduced, and that when a ship is in motion, etc., the deteriorated lubricant oil remaining at the bottom will circulate throughout a lubricant oil line, affecting bearing lubrication and other functions. In contrast, by providing the lower oil drain holes 56A at the lower end <NUM> of the protruding pipe <NUM>, old lubricant oil is prevented from remaining at the bottom of the lubricant oil storage part <NUM>, eliminating the above concerns.

<FIG> is a schematic cross-sectional view showing an example of a detailed configuration of a portion in the vicinity of the lubricant oil discharge part <NUM> shown in <FIG>. <FIG> is a schematic cross-sectional view showing another example of a detailed configuration of a portion in the vicinity of the lubricant oil discharge part <NUM> shown in <FIG>. <FIG> is a schematic cross-sectional view showing another example of a detailed configuration of a portion in the vicinity of the lubricant oil discharge part <NUM> shown in <FIG>. <FIG> is a schematic cross-sectional view showing another example of a detailed configuration of a portion in the vicinity of the lubricant oil discharge part <NUM> shown in <FIG>. In some embodiments described below, unless otherwise stated, common reference characters with those in the aforementioned configurations denote the same constituent components as those in the aforementioned configurations, and the description thereof will be omitted.

In some embodiments, for example, as shown in <FIG>, the proximal end portion of the protruding pipe <NUM> may be secured to the upper surface <NUM> of the bottom lid <NUM> by welding. In the illustrated example, the lubricant oil discharge part <NUM> includes a weld portion <NUM> (weld metal) connecting the outer peripheral surface <NUM> of the protruding pipe <NUM> and the upper surface <NUM> of the bottom lid <NUM>, the protruding pipe <NUM>, and a weld portion <NUM> (weld metal) connecting the inner peripheral surface <NUM> of the protruding pipe <NUM> and the upper surface of the bottom lid <NUM>.

In this case, for example, as shown in <FIG>, the above-described lower oil drain holes 56A (or lower end oil drain holes 56A1) may be formed to penetrate the weld portion <NUM>, the protruding pipe <NUM>, and the weld portion <NUM> in this order. As a result, since the lower oil drain holes 56A can be formed in lower positions, the replacement of the lubricant oil in the lubricant oil storage part <NUM> can be effectively promoted, and the lubricant oil in the lubricant oil storage part <NUM> can be almost completely emptied when the operation of the turbocharger <NUM> is stopped.

Alternatively, for example, as shown in <FIG>, the lower oil drain holes 56A may be formed above the weld portions <NUM>, <NUM> to avoid the weld portions <NUM>, <NUM>. This reduces damage to the weld portions <NUM>, <NUM> and increases the strength of the joint between the protruding pipe <NUM> and the bottom lid <NUM>.

For example, as shown in <FIG>, the lower end oil drain holes 56A1 may be formed to gouge the upper surface <NUM> of the bottom lid <NUM>. In the example shown in <FIG>, the lower end oil drain holes 56A1 are formed along the lower end of the weld portion <NUM>, the boundary between the protruding pipe <NUM> and the bottom lid <NUM>, and the weld portion <NUM>. Thus, it is possible to discharge the oil more efficiently through the lower end oil drain holes 56A1.

Further, for example, as shown in <FIG>, the inner diameter D1 of the protruding pipe <NUM> may be larger than the diameter D0 of the lubricant oil outlet <NUM>. In the case where the inner peripheral surface of the lubricant oil outlet <NUM> formed in the bottom lid <NUM> contracts downward as shown in <FIG>, the diameter D0 of the lubricant oil outlet <NUM> means the diameter at the upper end of the lubricant oil outlet <NUM>. The configuration shown in <FIG> has a weld portion <NUM> connecting the lower end of the lubricant oil outlet <NUM> in the bottom lid <NUM> to the upper surface of the flange <NUM>, and a weld portion <NUM> connecting the lower surface of the bottom lid <NUM> to the outer peripheral surface of the flange <NUM>.

If the inner diameter D1 of the protruding pipe <NUM> is equal to or smaller than the diameter D0 of the lubricant oil outlet <NUM> as shown in <FIG>, when the lower end oil drain hole 56A1 is provided closer to the bottom lid <NUM> in the protruding pipe <NUM>, the lubricant oil may leak out through a path in the weld portions <NUM>, <NUM> (a path between the lower end of the protruding pipe <NUM> and the bottom lid <NUM> and between the bottom lid <NUM> and the flange <NUM>) and a bolt hole <NUM> in the flange <NUM>, as indicated by the arrow F1.

In contrast, if the inner diameter D1 of the protruding pipe <NUM> is larger than the diameter D0 of the lubricant oil outlet <NUM> as shown in <FIG>, the lower end of the protruding pipe <NUM> is located horizontally away from the weld portion <NUM>, reducing the possibility that the lubricant oil leaks as indicated by the arrow F1 in <FIG>.

In some embodiments, for example, in any one of the configurations shown in <FIG>, the total cross-sectional area (passage cross-sectional area) of all the lower oil drain holes 56A formed in the protruding pipe <NUM> is smaller than the cross-sectional area (passage cross-sectional area) of the lubricant oil outlet <NUM>. For example, when fourth lower oil drain holes <NUM> are formed in the protruding pipe <NUM>, the total cross-sectional area of the four lower oil drain holes 56A is smaller than the cross-sectional area of the lubricant oil outlet <NUM>. Further, the total cross-sectional area of all the lower oil drain holes 56A formed in the protruding pipe <NUM> is such that the flow rate of the lubricant oil flowing through all the lower oil drain holes 56A in the protruding pipe <NUM> is equal to or less than <NUM>% of the minimum flow rate of the lubricant oil supplied to the turbocharger <NUM> during operation of the turbocharger <NUM> (the lower limit value of the flow rate of the lubricant oil supplied to the lubricant oil inlet <NUM> during operation of the turbocharger <NUM>).

With this configuration, even when the flow rate of the lubricant oil supplied to the turbocharger <NUM> is the minimum flow rate, lubricant oil can be stored in the lubricant oil storage part <NUM>, and the outlet temperature of the lubricant oil in the turbocharger <NUM> can be measured stably and accurately by the thermometer <NUM> (see <FIG>) with the temperature sensor <NUM> disposed in the lubricant oil storage part <NUM>.

In some embodiments, for example, as shown in <FIG>, the thermometer <NUM> is arranged with the tip side of the probe <NUM> tilted toward the protruding pipe <NUM> with respect to the vertical direction. In the illustrated example, the thermometer <NUM> is installed on the bottom lid <NUM>, with the longitudinal direction of the probe <NUM> inclined with respect to the vertical direction so that the distance from the protruding pipe <NUM> decreases as it extends from the bottom lid <NUM> upward (toward the tip of the probe <NUM> in the longitudinal direction of the thermometer <NUM>).

With this configuration, the temperature sensor <NUM> of the thermometer <NUM> can be brought closer to the oil drain hole <NUM> in the protruding pipe <NUM> to measure the temperature of lubricant oil near the oil drain hole <NUM> (i.e., lubricant oil not stagnating in the lubricant oil storage part <NUM>), while suppressing interference of the base end of the probe <NUM> (opposite the temperature sensor <NUM>) with the flanges <NUM>, <NUM> or the oil outlet pipe <NUM> (see <FIG>) connected to the lubricant oil outlet <NUM>. Therefore, it is possible to accurately measure the temperature of the lubricant oil which reflects the state of the bearings <NUM> to <NUM> well, while suppressing interference of the base end of the thermometer <NUM> with the flange <NUM> or the oil outlet pipe <NUM> connected to the lubricant oil outlet <NUM>.

In some embodiments, for example, as shown in <FIG>, the thermometer <NUM> is arranged with the tip side of the probe <NUM> tilted toward the protruding pipe <NUM> with respect to the vertical direction. In the illustrated example, the thermometer <NUM> is installed on the inner peripheral surface <NUM> of the casing part <NUM>, with the longitudinal direction of the probe <NUM> inclined with respect to the vertical direction so that the distance from the protruding pipe <NUM> decreases as it extends from the inner peripheral surface <NUM> of the casing part <NUM> downward (toward the temperature sensor <NUM> in the longitudinal direction of the probe <NUM>).

With this configuration, the temperature sensor <NUM> of the thermometer <NUM> can be brought closer to the oil drain hole <NUM> in the protruding pipe <NUM> to measure the temperature of the lubricant oil near the oil drain hole <NUM> (i.e., the lubricant oil not stagnating in the lubricant oil storage tank <NUM>), while preventing interference of the base end of the probe <NUM> (opposite the temperature sensor <NUM>) with the flanges <NUM>, <NUM> or the oil outlet pipe <NUM> (see <FIG>) connected to the lubricant oil outlet <NUM>. Therefore, it is possible to accurately measure the temperature of the lubricant oil which reflects the state of the bearings <NUM> to <NUM> well, while suppressing interference of the base end of the thermometer <NUM> with the flange <NUM> or the oil outlet pipe <NUM> connected to the lubricant oil outlet <NUM> or a structure such as a support (not shown) of the turbocharger <NUM>. Further, compared to the configuration in which the probe <NUM> of the thermometer <NUM> is inserted into the lubricant oil storage part <NUM> through the mounting hole in the bottom lid <NUM> (e.g., the configuration shown in <FIG>), it is possible to reduce the possibility that the lubricant oil remaining on the bottom lid <NUM> of the lubricant oil storage part <NUM> leaks out through the mounting hole of the thermometer <NUM> when the thermometer <NUM> is removed from the lubricant oil storage part <NUM>. Further, as described above, suppressing interference of the base end of the thermometer <NUM> with the flange <NUM> or the oil outlet pipe <NUM> connected to the lubricant oil outlet <NUM> or a structure such as a support (not shown) of the turbocharger <NUM> makes it easy to mount the thermometer <NUM> on the casing part <NUM>.

When the turbocharger <NUM> is, for example, a marine turbocharger, it is desirable that the temperature sensor <NUM> at the tip of the probe <NUM> is disposed below the oil level <NUM> of the lubricant oil in the lubricant oil storage part <NUM> even when the turbocharger <NUM> is tilted at <NUM> degrees, which is a predetermined inclination angle specified by ship classification.

For example, as shown in <FIG>, assuming that X is the height from the bottom lid <NUM> of the lubricant oil storage part <NUM> to the tip of the probe <NUM> of the thermometer <NUM>, A is the height from the bottom lid <NUM> of the lubricant oil storage part <NUM> to the tip of the protruding pipe <NUM>, and B is the distance between the inner peripheral surface <NUM> of the protruding pipe <NUM> and the probe <NUM> at the position furthest from the thermometer <NUM> in the circumferential direction of the protruding pipe <NUM>, when the turbocharger <NUM> is tilted at angle θ with respect to the horizontal direction, the position of the oil level <NUM> of the lubricant oil in the lubricant oil storage part <NUM> is as shown in <FIG>. Here, assuming that the angle θ is the maximum inclination angle specified by ship classification or the maximum inclination angle conceivable in design of a ship or an engine, whichever is greater, the tip of the thermometer <NUM> can be disposed below the oil level <NUM> when the following expression (a) is satisfied. The angle θ may be, for example, <NUM> degrees.

Thus, the tip of the probe <NUM> of the thermometer <NUM> is prevented from being exposed to air, and the outlet temperature of the lubricant oil in the turbocharger <NUM> can be measured stably and accurately. The height position of the tip of the probe <NUM> and the height position of the protruding pipe <NUM> may be adjusted in consideration of oscillation of the oil level <NUM> due to external vibration.

In some embodiments, for example as shown in <FIG>, the upper surface <NUM> of the bottom lid <NUM> of the lubricant oil storage part <NUM> includes an inclined surface <NUM> that is inclined downward toward the protruding pipe <NUM>.

In the configuration shown in <FIG>, the upper surface of the bottom lid <NUM> is formed in a concave shape that is recessed downward in the vertical direction. The bottom lid <NUM> is formed in, for example, a substantially truncated cone shape, and includes an annular flat plate portion <NUM> with the lubricant oil outlet <NUM> formed in the center, and an annular inclined plate portion <NUM> connected to the outer periphery of the flat plate portion <NUM> and inclined upward with an increase in horizontal distance from the protruding pipe <NUM>. The outer edge of the inclined plate portion <NUM> is connected to the lower end of the casing part <NUM>, and the upper surface of the inclined plate portion <NUM> constitutes the inclined surface <NUM>. The flange <NUM> is secured to the lower surface of the flat plate portion <NUM> by welding. The probe <NUM> of the thermometer <NUM> is inserted into the lubricant oil storage part <NUM> through a mounting hole <NUM> formed in the inclined plate portion <NUM>. The thermometer <NUM> is arranged with the tip side of the probe <NUM> tilted toward the protruding pipe <NUM> with respect to the vertical direction. When the bottom lid <NUM> includes the inclined surface <NUM>, the shape of the bottom lid <NUM> is not limited to a substantially truncated cone shape, but may be any other shape, such as a substantially truncated pyramid shape.

Since the lubricant oil can be guided along the inclined surface <NUM> to the oil drain hole <NUM> of the protruding pipe <NUM>, the lubricant oil can be discharged more efficiently, and the replacement of the lubricant oil in the lubricant oil storage part <NUM> can be promoted. Thus, it is possible to accurately measure the temperature of the lubricant oil which reflects the state of the bearings <NUM> to <NUM> well. Further, since the remaining amount of lubricant oil in the lubricant oil storage part <NUM> can be close to empty when the operation of the turbocharger <NUM> is stopped, it is possible to suppress leakage of the lubricant oil when the bottom lid <NUM> is removed. In the configuration shown in <FIG>, the bottom lid <NUM> is not limited to a truncated cone shape, but may be a truncated pyramid shape.

In some embodiments, for example, as shown in <FIG>, the turbocharger further includes, in addition to the thermometer <NUM>, a thermometer <NUM> configured to measure the temperature of the lubricant oil. In this case, the thermometer <NUM> is disposed at a different position from the thermometer <NUM> in the circumferential direction of the protruding pipe <NUM>, and at least a part of the temperature sensor <NUM> of the thermometer <NUM> is disposed in the lubricant oil storage part <NUM>.

The thermometer <NUM> has the same configuration as the thermometer <NUM>. The thermometer <NUM> includes a probe <NUM>, and the tip of the probe <NUM> is provided with a temperature sensor <NUM> (temperature sensor) for measuring the temperature of the lubricant oil. The tip of the probe <NUM> is disposed below the oil level <NUM> of the lubricant oil stored in the lubricant oil storage part <NUM>, so the temperature sensor <NUM> of the thermometer <NUM> is disposed below the oil level <NUM> of the lubricant stored in the lubricant oil storage part <NUM>. The height Y from the upper surface <NUM> of the bottom lid <NUM> of the lubricant oil storage part <NUM> to the tip of the probe <NUM> of the thermometer <NUM> is different from the height X from the upper surface <NUM> of the bottom lid <NUM> of the lubricant oil storage part <NUM> to the tip of the probe <NUM>.

In the configuration shown in <FIG>, since the thermometer <NUM> and the thermometer <NUM> are disposed at different positions from each other in the circumferential direction of the protruding pipe <NUM>, even when the turbocharger <NUM> is, for example, for marine use and is tilted, it is easy to keep the temperature sensor of any of the thermometers below the oil level <NUM> of the lubricant oil storage part <NUM>. Further, it is possible to accurately measure the temperature of the lubricant oil at multiple height positions, for example, the temperature of the lubricant oil near the oil level <NUM> in the lubricant oil storage part <NUM> and the temperature of the lubricant oil near the bottom lid <NUM> in the lubricant oil storage part <NUM>. Three or more thermometers may be provided in the lubricant oil storage part <NUM>.

In some embodiments, for example as shown in <FIG>, the lubricant oil discharge part <NUM> of the bearing pedestal <NUM> further includes a lid part <NUM> covering the opening in the upper end portion of the protruding pipe <NUM>. In the configuration shown in <FIG>, the protruding pipe <NUM> includes a plurality of lower oil drain holes 56A that penetrate the wall surface <NUM> of the lower portion <NUM> of the protruding pipe <NUM> and a plurality of upper oil drain holes 56B that penetrate the wall surface <NUM> of the protruding pipe <NUM> at a position above the plurality of lower oil drain holes 56A. The upper oil drain holes <NUM> are arranged at the same height at intervals in the circumferential direction of the protruding pipe <NUM>.

Here, the hole diameter of the upper oil drain hole 56B is larger than the hole diameter of the lower oil drain hole 56A. Additionally, the sum of the total cross-sectional area (passage cross-sectional area) of all the lower oil drain holes 56A formed in the protruding pipe <NUM> and the total cross-sectional area (passage cross-sectional area) of all the upper oil drain holes 56B formed in the protruding pipe <NUM> is equal to or larger than the cross-sectional area (passage cross-sectional area) of the lubricant oil outlet <NUM>. In other words, the sum of the total cross-sectional area of all the lower oil drain holes 56A formed in the protruding pipe <NUM> and the total cross-sectional area of all the upper oil drain holes 56B formed in the protruding pipe <NUM> is equal to the cross-sectional area of the lubricant oil outlet <NUM> or is larger than the cross-sectional area of the lubricant oil outlet <NUM>. In the case where the passage cross-sectional area of each hole is not constant, the cross-sectional area of the hole means the minimum value of the passage cross-sectional area of the hole.

In the configuration shown in <FIG>, since the lid part <NUM> covers the opening in the upper end portion of the protruding pipe <NUM>, it is possible to prevent the lubricant oil falling from above (from the bearings <NUM> to <NUM>) from entering the protruding pipe <NUM> without passing through the lubricant oil storage part <NUM>. This ensures that the lubricant oil from above always falls once into the lubricant oil storage part <NUM> and facilitates storing the lubricant oil in the lubricant oil storage part <NUM>. Further, since the lubricant oil always passes through the lubricant oil storage part <NUM>, the lubricant oil is agitated in the lubricant oil storage part <NUM>, and the oil temperature is equalized. Thus, it is possible to accurately measure the average temperature of the entire lubricant oil.

Further, by providing the upper oil drain hole 56B of appropriate size larger than the lower oil drain hole 56A above the lower oil drain hole 56A, the height of the oil level <NUM> of the lubricant oil in the lubricant oil storage part <NUM> can be maintained at the height of the upper oil drain hole 56B. Thus, it is possible to suppress the rising of the oil level <NUM> of the lubricant oil in the lubricant oil storage part <NUM> to an undesirable height position (e.g., the height position of any of the bearings <NUM> to <NUM> of the turbocharger <NUM>, the height position of the shaft <NUM> of the turbocharger <NUM>, or the height position of a seal part (not shown) to prevent the leakage of lubricant oil).

The lubricant oil outlet <NUM> of the turbocharger <NUM> has a cross-sectional area that allows the maximum flow rate of the lubricant oil specified in the turbocharger <NUM> to flow without any hindrance. By making the sum of the total cross-sectional area of the lower oil drain holes 56A and the total cross-sectional area of the upper oil drain holes 56B larger than the lubricant oil outlet <NUM> having such a cross-sectional area, the height of the oil level <NUM> of the lubricant oil in the lubricant oil storage part <NUM> can be limited to the height of the upper oil drain holes 56B even when the maximum flow rate of the lubricant oil specified in the turbocharger <NUM> flows. Thus, it is possible to suppress the rising of the oil level <NUM> of the lubricant oil in the lubricant oil storage part <NUM> to the undesirable height position as described above.

The present disclosure is not limited to the embodiments described above, but includes modifications to the embodiments described above, and embodiments composed of combinations of those embodiments.

For example, as shown in <FIG>, no oil drain hole <NUM> may be formed in the protruding pipe <NUM>. In this case, for example, the mounting hole <NUM> shown in <FIG> may be used as the oil drain hole for discharging the lubricant oil from the lubricant oil storage part <NUM>, or other oil drain holes may be provided in the casing part <NUM> or the bottom lid <NUM> to discharge the lubricant oil from the lubricant oil storage part <NUM>. Further, in this case, the lubricant oil discharged from the oil drain hole may be supplied to the oil outlet pipe <NUM>.

For example, in the configuration shown in <FIG>, etc., multiple oil drain holes <NUM> (lower oil drain holes 56A or lower end oil drain holes 56A1) are provided at intervals in the circumferential direction, but the number of oil drain holes <NUM> may be only one, or at least one.

In the configuration shown in <FIG>, multiple lower oil drain holes 56A (lower end oil drain holes 56A1) are provided at intervals in the circumferential direction, but the number of lower oil drain holes 56A (lower end oil drain holes 56A1) may be only one, or at least one. Further, multiple upper oil drain holes 56B are provided at intervals in the circumferential direction, but the number of upper oil drain holes 56B may be only one, or at least one.

The contents described in the above embodiments would be understood as follows, for instance.

With the turbocharger described in the above (<NUM>), by discharging the lubricant oil stored in the lubricant oil storage part through the oil drain hole, the lubricant oil is prevented from remaining in the lubricant oil storage part, and the replacement of the lubricant oil in the lubricant oil storage part can be promoted. Therefore, it is possible to accurately measure the temperature of the lubricant oil which reflects the state of the bearings well.

If old lubricant oil continues to remain in the lubricant oil storage part, the oil quality of the lubricant oil line deteriorates when the old lubricant oil flows out of the lubricant oil storage part for some reason. However, with the configuration described in the above (<NUM>), the replacement of the lubricant oil in the lubricant oil storage part can be promoted, so that the deterioration of lubricant oil quality can be suppressed.

(<NUM>) In some embodiments, in the turbocharger described in the above (<NUM>) or (<NUM>), the first thermometer includes a first probe (e.g., the above-described probe <NUM>) having the first temperature sensor at a tip side. The tip of the first probe is disposed below an oil level of the lubricant oil stored in the lubricant oil storage part.

With the turbocharger described in the above (<NUM>), since the tip of the first probe is disposed below the oil level of the lubricant oil stored in the lubricant oil storage part, the lubricant oil stored in the lubricant oil storage part prevents the temperature sensor of the first temperature sensor from being exposed to air. In other words, at least a part of the first temperature sensor can be placed in an oil-tight condition. Thus, the outlet temperature of the lubricant oil in the turbocharger can be measured stably and accurately.

(<NUM>) In some embodiments, in the turbocharger described in any one of the above (<NUM>) to (<NUM>), the lubricant oil storage part includes a protruding pipe (e.g., the above-described protruding pipe <NUM>) that protrudes upward from the lubricant oil outlet. The lubricant oil storage part is configured to store the lubricant oil between an outer peripheral surface of the protruding pipe and an inner surface of the lubricant oil discharge part.

With the turbocharger described in the above (<NUM>), the lubricant oil can be stored around the lubricant oil outlet in the lubricant oil discharge part with a simple configuration. Thus, the outlet temperature of the lubricant oil in the turbocharger can be measured accurately with a simple configuration.

(<NUM>) In some embodiments, in the turbocharger described in the above (<NUM>), an inner diameter (e.g., the above-described inner diameter D1) of the protruding pipe is larger than a diameter (e.g., the above-described inner diameter D0) of the lubricant oil outlet.

With the turbocharger described in the above (<NUM>), it is possible to suppress the leakage of lubricant oil caused by damage to a weld portion in the case where the protruding pipe and the lubricant oil outlet are connected by welding.

(<NUM>) In some embodiments, in the turbocharger described in the above (<NUM>) or (<NUM>), the lubricant oil storage part includes at least one oil drain hole (e.g., the above-described oil drain holes <NUM>, lower oil drain holes 56A, lower end oil drain holes 56A1, and upper oil drain holes 56B) for discharging the lubricant oil from the lubricant oil storage part. The at least one oil drain hole is configured to penetrate a wall surface of the protruding pipe.

With the turbocharger described in the above (<NUM>), by discharging the lubricant oil stored in the lubricant oil storage part through the oil drain hole of the protruding pipe, the lubricant oil is prevented from remaining in the lubricant oil storage part with a simple configuration, and the replacement of the lubricant oil in the lubricant oil storage part can be promoted. Therefore, it is possible to accurately measure the temperature of the lubricant oil which reflects the state of the bearings of the turbocharger well with a simple configuration. Further, by promoting the replacement of the lubricant oil in the lubricant oil storage part, it is possible to suppress the deterioration of lubricant oil quality.

(<NUM>) In some embodiments, in the turbocharger described in the above (<NUM>), the at least one oil drain hole includes at least one lower oil drain hole (e.g., the above-described lower oil drain holes 56A) configured to penetrate a wall surface of a lower portion of the protruding pipe.

With the turbocharger described in the above (<NUM>), by providing the lower oil drain hole in the lower portion of the protruding pipe, gravity can be used to effectively promote the replacement of the lubricant oil in the lubricant oil storage part. Therefore, it is possible to accurately measure the temperature of the lubricant oil which reflects the state of the bearings well with a simple configuration. Further, it is possible to effectively suppress the deterioration of lubricant oil quality.

(<NUM>) In some embodiments, in the turbocharger described in the above (<NUM>), the at least one lower oil drain hole includes at least one lower end oil drain hole (e.g., the above-described lower end oil drain holes 56A1) provided at a lower end of the protruding pipe.

With the turbocharger described in the above (<NUM>), by providing the lower end oil drain hole at the lower end of the protruding pipe, gravity can be used to effectively promote the replacement of the lubricant oil in the lubricant oil storage part. Further, by discharging the lubricant oil in the lubricant oil storage part through the lower end oil drain hole when the operation of the turbocharger is stopped, the lubricant oil in the lubricant oil storage part can be almost empty. Thus, old lubricant oil is prevented from remaining at the bottom of the lubricant oil storage part, which prevents the accuracy of lubricant oil temperature measurement from decreasing, and when a ship is in motion, etc., the deteriorated lubricant oil remaining at the bottom from circulating throughout a lubricant oil line, affecting bearing lubrication and other functions. Further, it is possible to reduce the outflow of oil from the lubricant oil storage part, for example, when disassembling the casing (e.g., if the lubricant oil storage part has a bottom lid, when removing the bottom lid). In addition to when removing the bottom lid, for example, when removing (replacing) the temperature sensor or transporting the turbocharger, it is possible to reduce the outflow of oil from the lubricant oil storage part.

(<NUM>) In some embodiments, in the turbocharger described in the above (<NUM>), the at least one lower end oil drain hole is formed to gouge an upper surface of a bottom wall (e.g., the above-described bottom lid <NUM>) of the lubricant oil discharge part.

With the turbocharger described in the above (<NUM>), the lubricant oil can be discharged from the lubricant oil storage part more efficiently.

(<NUM>) In some embodiments, in the turbocharger described in any one of the above (<NUM>) to (<NUM>), a total cross-sectional area of all the lower oil drain holes provided in the protruding pipe is smaller than a cross-sectional area of the lubricant oil outlet.

With the turbocharger described in the above (<NUM>), the lubricant oil can be effectively stored in the lubricant oil storage part, and the outlet temperature of the lubricant oil in the turbocharger can be measured stably and accurately.

(<NUM>) In some embodiments, in the turbocharger described in any one of the above (<NUM>) to (<NUM>), a total cross-sectional area of all the lower oil drain holes provided in the protruding pipe is such that a total flow rate of the lubricant oil flowing through all the lower oil drain holes in the protruding pipe is equal to or less than <NUM>% of a minimum flow rate of the lubricant oil supplied to the turbocharger during operation of the turbocharger.

With the turbocharger described in the above (<NUM>), even when the flow rate of the lubricant oil supplied to the turbocharger is the minimum flow rate specified in the turbocharger, lubricant oil can be stored in the lubricant oil storage part, and the outlet temperature of the lubricant oil in the turbocharger can be measured stably and accurately.

(<NUM>) In some embodiments, in the turbocharger described in any one of the above (<NUM>) to (<NUM>), the first thermometer includes a first probe having the first temperature sensor at a tip side. The first thermometer is arranged with the tip side of the first probe tilted toward the protruding pipe with respect to a vertical direction.

With the turbocharger described in the above (<NUM>), the first temperature sensor can be brought closer to the oil drain hole in the protruding pipe to measure the temperature of lubricant oil near the oil drain hole (i.e., lubricant oil not stagnating in the lubricant oil storage part), while suppressing interference of the base end of the first probe (opposite the temperature sensor) with flanges or pipes connected to the lubricant oil outlet. Therefore, it is possible to accurately measure the temperature of the lubricant oil which reflects the state of the bearings well, while suppressing interference of the base end of the first probe with flanges or pipes connected to the lubricant oil outlet.

(<NUM>) In some embodiments, in the turbocharger described in any one of the above (<NUM>) to (<NUM>), an upper surface of a bottom wall of the lubricant oil storage part includes an inclined surface (e.g., the above-described inclined surface <NUM>) that is inclined downward toward the protruding pipe.

With the turbocharger described in the above (<NUM>), since the lubricant oil can be guided along the inclined surface to the oil drain hole of the protruding pipe, the lubricant oil can be discharged more efficiently, and the replacement of the lubricant oil in the lubricant oil storage part can be promoted. Thus, it is possible to accurately measure the temperature of the lubricant oil which reflects the state of the bearings.

(<NUM>) In some embodiments, in the turbocharger described in any one of the above (<NUM>) to (<NUM>), the at least one oil drain hole includes a plurality of oil drain holes (e.g., the above-described oil drain holes <NUM>, lower oil drain holes 56A, lower end oil drain holes 56A1, upper oil drain holes 56B) provided at intervals in a circumferential direction of the protruding pipe.

With the turbocharger described in the above (<NUM>), even when the turbocharger is, for example, for marine use and is tilted, the remaining amount of lubricant oil in the lubricant oil storage part can be close to empty when the operation of the turbocharger is stopped.

(<NUM>) In some embodiments, in the turbocharger described in any one of the above (<NUM>) to (<NUM>), the turbocharger includes a second thermometer (e.g., the above-described thermometer <NUM>) including a second temperature sensor (e.g., the above-described temperature sensor <NUM>) for measuring temperature of the lubricant oil. At least a part of the second temperature sensor is disposed in the lubricant oil storage part. The second thermometer is disposed at a different position from the first thermometer in a circumferential direction of the protruding pipe.

With the turbocharger described in the above (<NUM>), since the first thermometer and the second thermometer are disposed at different positions from each other in the circumferential direction, even when the turbocharger is, for example, for marine use and is tilted, it is easy to keep the temperature sensor of any of the thermometers below the oil level of the lubricant oil storage part. The lubricant oil outlet temperature measuring device may be equipped with three or more thermometers disposed at different positions from each other in the circumferential direction of the protruding pipe.

(<NUM>) In some embodiments, in the turbocharger described in the above (<NUM>), the first thermometer includes a first probe (e.g., the above-described probe <NUM>) having the first temperature sensor at a tip side. The second thermometer includes a second probe (e.g., the above-described probe <NUM>) having the second temperature sensor at a tip side. A height (e.g., the above-described height X) from an upper surface of a bottom wall of the lubricant oil storage part to the tip of the first probe is different from a height (e.g., the above-described height Y) from the upper surface of the bottom wall of the lubricant oil storage part to the tip of the second probe.

With the turbocharger described in the above (<NUM>), it is possible to accurately measure the temperature of the lubricant oil at multiple height positions, for example, the temperature of the lubricant oil near the oil level in the lubricant oil storage part and the temperature of the lubricant oil near the bottom of the lubricant oil storage part.

(<NUM>) In some embodiments, in the turbocharger described in any one of the above (<NUM>) to (<NUM>), the first thermometer includes a first probe having the first temperature sensor at a tip side. The tip of the first probe is disposed below an upper end of the protruding pipe.

With the turbocharger described in the above (<NUM>), the tip of the first probe can be placed below the oil level of the lubricant oil in the lubricant oil storage part when the lubricant oil is stored in the lubricant oil storage part to the height of the upper end of the protruding pipe, so that the temperature of the lubricant oil can be measured accurately by preventing the first temperature sensor from being exposed to air.

(<NUM>) In some embodiments, in the turbocharger described in any one of the above (<NUM>) to (<NUM>), the first thermometer includes a first probe having the first temperature sensor at a tip side, and the following expression (a) is satisfied: <MAT> where X is a height from a bottom wall of the lubricant oil storage part to the tip of the first probe, A is a height from a bottom surface of the lubricant oil storage part to the tip of the protruding pipe, B is a distance between an inner peripheral surface of the protruding pipe and the tip of the first probe at a position furthest from the first thermometer in a circumferential direction of the protruding pipe, and θ is a maximum inclination angle specified by ship classification or a maximum inclination angle conceivable in design of a ship or an engine, whichever is greater.

With the turbocharger described in the above (<NUM>), even when the turbocharger is tilted at the maximum inclination angle specified by ship classification or the maximum inclination angle conceivable in design of a ship or an engine, whichever is greater, the tip of the first thermometer is prevented from protruding from the oil level. Thus, the part of the first thermometer disposed in the lubricant oil storage part is prevented from being exposed to air, and the outlet temperature of the lubricant oil in the turbocharger can be measured stably and accurately.

(<NUM>) In some embodiments, in the turbocharger described in any one of the above (<NUM>) to (<NUM>), the turbocharger further includes a lid part (e.g., the above-described lid part <NUM>) for covering an opening in an end portion of the protruding pipe.

With the turbocharger described in the above (<NUM>), since the lid part covers the opening in the end portion of the protruding pipe, it is possible to prevent the lubricant oil falling from above from entering the protruding pipe without passing through the lubricant oil storage part between the outer peripheral surface of the protruding pipe and the inner surface of the lubricant oil discharge part. This ensures that the lubricant oil from above always falls once into the lubricant oil storage part and facilitates storing the lubricant oil in the lubricant oil storage part. Further, since the lubricant oil always passes through the lubricant oil storage part, the lubricant oil is agitated in the lubricant oil storage part, and the oil temperature is equalized. Thus, it is possible to accurately measure the average temperature of the entire lubricant oil.

(<NUM>) In some embodiments, in the turbocharger described in the above (<NUM>), the at least one oil drain hole includes at least one lower oil drain hole (e.g., the above-described lower oil drain holes 56A, lower end oil drain holes 56A1) that penetrates a wall surface of a lower portion of the protruding pipe and at least one upper oil drain hole (e.g., the above-described upper oil drain holes 56B) that penetrates a wall surface of the protruding pipe at a position above the at least one lower oil drain hole.

With the turbocharger described in the above (<NUM>), by providing the lower oil drain hole in the lower portion of the protruding pipe, gravity can be used to effectively promote the replacement of the lubricant oil in the lubricant oil storage part. Therefore, it is possible to accurately measure the temperature of the lubricant oil which reflects the state of the bearings of the turbocharger well with a simple configuration. Further, by providing the upper oil drain hole of appropriate size above the lower oil drain hole, the height of the oil level of the lubricant oil in the lubricant oil storage part can be limited to the height of the upper oil drain hole. Thus, it is possible to suppress the rising of the oil level of the lubricant oil in the lubricant oil storage part to an undesirable height position (e.g., the height position of the bearing of the turbocharger, the height position of the shaft of the turbocharger, or the height position of a seal part to prevent the leakage of lubricant oil).

(<NUM>) In some embodiments, in the turbocharger described in the above (<NUM>), a hole diameter of the at least one upper oil drain hole is larger than a hole diameter of the at least one lower oil drain hole.

With the turbocharger described in the above (<NUM>), by providing the upper oil drain hole of appropriate diameter larger than the lower oil drain hole above the lower oil drain hole, the height of the oil level of the lubricant oil in the lubricant oil storage part can be limited to the height of the upper oil drain hole. Thus, it is possible to suppress the rising of the oil level of the lubricant oil in the lubricant oil storage part to the undesirable height position as described above.

(<NUM>) In some embodiments, in the turbocharger described in the above (<NUM>) or (<NUM>), the first thermometer includes a first probe having the first temperature sensor at a tip side. The tip of the first probe is disposed between the lower oil drain hole and the upper oil drain hole in a height direction.

With the turbocharger described in the above (<NUM>), the tip of the first probe can be placed below the oil level of the lubricant oil in the lubricant oil storage part when the lubricant oil is stored in the lubricant oil storage part to the height of the upper oil drain hole, so that the temperature of the lubricant oil can be measured accurately by preventing the first temperature sensor from being exposed to air.

(<NUM>) In some embodiments, in the turbocharger described in any one of the above (<NUM>) to (<NUM>), the sum of a total cross-sectional area of all the lower oil drain holes formed in the protruding pipe and a total cross-sectional area of all the upper oil drain holes formed in the protruding pipe is equal to or larger than a cross-sectional area of the lubricant oil outlet.

Claim 1:
A turbocharger, comprising:
a bearing (<NUM>-<NUM>) supplied with lubricant oil;
a casing (<NUM>) for accommodating the bearing (<NUM>-<NUM>); and
a first thermometer (<NUM>) including a first temperature sensor (<NUM>) for measuring temperature of the lubricant oil,
wherein the casing includes a lubricant oil discharge part (<NUM>) having a lubricant oil outlet (<NUM>) for discharging the lubricant oil from the turbocharger,
wherein the lubricant oil discharge part (<NUM>) includes a lubricant oil storage part (<NUM>) for storing the lubricant oil, characterized by
the lubricant oil storage part (<NUM>) being provided so as to store lubricant oil falling from the bearing (<NUM>-<NUM>), and
wherein the first temperature sensor (<NUM>) is disposed in the lubricant oil storage part (<NUM>).