JP2011122557A - Oil feeder for thrust bearing and exhaust turbine supercharger provided with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oil feeder for a thrust bearing, capable of reducing bearing loss even with a rotating shaft at low rotating speed such as in low speed operation at an engine start or in a low engine load state. <P>SOLUTION: The oil feeder 6 for the thrust bearing 5 supplies lubricating oil to a sliding surface 18 between a disk-like thrust collar 4 provided on the rotating shaft 3 and rotated integrally with the rotating shaft 3 and the thrust bearing 5 facing the thrust collar 4 and rotatably supporting a thrust force acting in the axial direction of the rotating shaft 3. The oil feeder includes a sensor 15 which detects a rotating speed of the rotating shaft 3; and a temperature adjustment means 9 which controls, based on the rotating speed of the rotating shaft 3 detected by the sensor 15, the temperature of lubricating oil to be fed to the thrust bearing 5. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an oil supply device for a thrust bearing capable of reducing bearing loss in a rotating shaft of a high-speed rotating body such as a supercharger, and an exhaust turbine supercharger including the same.

  Conventionally, in a rotating shaft of a high-speed rotating body such as a supercharger, a thrust force under a high-speed rated load condition becomes very large, so it is indispensable to design a large thrust bearing. On the other hand, since the thrust force is reduced under conditions where the rotational speed of the rotating shaft is low, such as when the engine is started or when the engine is under low load, the thrust bearings designed for the maximum load of the thrust force are For this reason, there is a problem that bearing loss increases, and as a result, the influence on the performance of the entire turbocharger increases.

In order to reduce such a bearing loss at the time of starting the engine or at a low engine load, it is known to supply lubricating oil to the thrust bearing. In general, the viscosity of oil varies greatly depending on the oil temperature. When the oil temperature is low, the viscosity is high, and when the oil temperature is high, the viscosity is low. If the lubricating oil is supplied to the thrust bearing without adjusting its temperature, the lubricating oil with low temperature and high viscosity will be supplied when starting the engine or when the engine is under low load. There has been a problem that the load on the entire turbocharger is increased.
In order to solve such problems, an oil supply device for a thrust bearing is known that can increase the oil temperature of the lubricating oil to keep the viscosity small and reduce bearing loss (see, for example, Patent Document 1).

  There is also known a thrust bearing oiling device that can reduce bearing loss by supplying an appropriate amount of lubricating oil corresponding to the amount of oil sucked into the bearing by centrifugal force generated when the bearing rotates (for example, , See Patent Document 2).

Japanese Patent Laid-Open No. 57-1224029 JP 2009-19600 A

However, in Patent Document 1, since the lubricating oil heated by the heat from the exhaust gas is supplied to the bearing, when the rotational speed is large, the lubricating oil having a higher temperature than necessary is supplied, and the bearing is at a temperature higher than the heat resistance temperature. In some cases, the bearing loss may be increased.
In addition, when the temperature is higher than the heat resistance temperature of the bearing, the valve is operated according to the oil temperature, and unheated lubricating oil is supplied to the bearing. There was a problem that appropriate temperature adjustment according to the number could not be performed.

  Further, in Patent Document 2, although an appropriate amount of lubricating oil can be supplied to the bearing, when the rotational speed is small and the load applied to the thrust bearing is small, the sliding contact surface with the thrust bearing becomes large, so that the bearing loss is increased. As a result, there is a problem that bearing loss increases.

  The present invention has been made in view of such circumstances, and controls the temperature of the lubricating oil supplied to the thrust bearing on the basis of the rotational speed of the rotating shaft, and is at a low speed when the rotational speed is small. Another object of the present invention is to provide an oil supply device for a thrust bearing capable of reducing bearing loss and an exhaust turbine supercharger equipped with the oil supply device.

In order to solve the above problems, the oil supply device for a thrust bearing of the present invention employs the following means.
That is, an oil supply device for a thrust bearing portion according to the present invention is provided on a rotating shaft, and rotates in an integrated manner with the rotating shaft, and is opposed to the thrust collar, and the shaft of the rotating shaft. In a lubrication device for a thrust bearing that supplies lubricating oil to a sliding contact surface with a thrust bearing that rotatably supports a thrust force acting in a direction, a sensor that detects the number of rotations of the rotating shaft, and the sensor that is detected by the sensor A thrust bearing oil supply device comprising: a temperature adjusting means for controlling the temperature of the lubricating oil supplied to the thrust bearing based on the number of rotations of the rotating shaft.

  According to the thrust bearing oil supply device of the present invention, the temperature of the lubricating oil supplied to the thrust bearing is controlled based on the rotational speed of the rotating shaft detected by the sensor. Even at a low speed such as the time, the temperature of the lubricating oil supplied to the thrust bearing can be raised by the temperature adjusting means to reduce the viscosity of the lubricating oil to an appropriate value. Therefore, it is possible to reliably lubricate the thrust bearing while reducing the sliding loss of the bearing.

  In the thrust bearing oil supply apparatus according to the present invention, the temperature adjusting means may include an oil heater disposed on a side surface of a head tank storing the lubricating oil.

  According to the present invention, since the oil heater is disposed on the side surface of the head tank that stores the lubricating oil, the temperature of the lubricating oil can be controlled based on the detected rotational speed of the rotating shaft. By doing in this way, the viscosity of the lubricating oil can be properly maintained by adjusting the temperature of the lubricating oil in the head tank with the oil heater and increasing the temperature of the lubricating oil supplied to the thrust bearing at the time of low speed rotation. . As a result, the sliding loss of the bearing can be reduced. Further, by turning off the heater during high-speed rotation, adjustment can be made so that the thrust bearing does not exceed the heat-resistant temperature during sliding.

  In the thrust bearing oil supply apparatus according to the present invention, the temperature adjusting means may include an oil heater disposed in the lubricating oil flow path.

According to the present invention, since the oil heater is disposed in the lubricating oil flow path, the temperature of the lubricating oil can be controlled based on the detected rotational speed of the rotating shaft. In this way, during low-speed rotation, the temperature of the lubricating oil flowing through the lubricating oil flow path is adjusted by the oil heater, and the temperature of the lubricating oil supplied to the thrust bearing is increased, so that the viscosity of the lubricating oil is maintained appropriately. be able to. As a result, the sliding loss of the bearing can be reduced. Further, by turning off the heater during high-speed rotation, it is possible to control the thrust bearing during sliding so that it does not exceed the heat-resistant temperature.
Furthermore, according to the present invention, since the oil heater is disposed in the lubricating oil flow path, the installation area of the oil heater can be reduced as compared with the case where the oil heater is disposed in the head tank.

  Further, in the thrust bearing oil supply device according to the present invention, the temperature adjusting means recirculates the lubricating oil after lubricating the thrust bearing to the thrust bearing, and flows through the recirculation channel. And a recirculation flow rate control valve for controlling the flow rate of the lubricating oil.

According to the present invention, the recirculation flow path for recirculating the lubricating oil after lubricating the thrust bearing to the thrust bearing, and the recirculation flow rate control valve for controlling the flow rate of the lubricating oil flowing through the recirculation flow path are provided. Since it is provided, the exhaust heat obtained from the circulating lubricating oil can be used as the heat source of the temperature adjusting mechanism.
When the sensor detects that the rotating shaft is rotating at a low speed, the heated lubricating oil can be supplied to the thrust bearing through the head tank by opening the recirculation flow rate control valve. As a result, the sliding loss of the thrust bearing can be reduced.
When it is detected that the rotating shaft is rotating at a low speed, the recirculation flow rate control valve is closed and the lubricating oil is sent to the oil supply tank. Since the lubricating oil is sufficiently cooled while being stored in the oil supply tank, the sufficiently cooled lubricating oil can be supplied to the thrust bearing.

  An oil supply device for a thrust bearing according to the present invention is the oil supply device for any one of the above thrust bearings, wherein the thrust bearing is divided into a plurality of divided regions, and the thrust force is less than a predetermined value. Sometimes only some of the divided areas are in sliding contact with the thrust collar, and when the thrust force is greater than or equal to a predetermined value, the other divided areas may be in sliding contact with the thrust collar. Good.

According to the present invention, when the thrust force applied to the thrust bearing is less than a predetermined value, only a part of the divided area of the thrust bearing is in sliding contact with the thrust collar, so even if the rotational speed of the rotating shaft is small. The sliding loss of the thrust bearing can be reduced. Also, when the thrust force applied to the thrust bearing is greater than or equal to a predetermined value, in addition to some of the divided areas, the other divided areas are in sliding contact with the thrust collar, so that when the rotating shaft rotates at high speed, the thrust area of the thrust bearing The bearing loss can be reduced while maintaining the load capacity applied to the thrust bearing.
Specifically, the divided area of the thrust bearing is divided into an inner peripheral side and an outer peripheral side, the inner peripheral thrust bearing is biased by an elastic member, and the inner peripheral thrust bearing is on the thrust collar side than the outer peripheral thrust bearing. Keep it in the position. As a result, when the thrust force is less than the predetermined value, only the inner circumferential thrust bearing comes into sliding contact with the thrust collar. When the thrust force is equal to or greater than a predetermined value, the thrust force overcomes the elastic force of the elastic member and presses the inner circumferential thrust bearing, and finally the thrust collar comes into sliding contact with the outer circumferential thrust bearing.

  Furthermore, an exhaust turbine supercharger according to the present invention is characterized by including the above-described thrust bearing oil supply device.

  According to the present invention, since the thrust bearing oil supply device as described above is provided, the exhaust turbine supercharger has high turbocharger performance even at a low speed such as when the engine is started or when the engine is under a low load. Machine can be provided.

  According to the thrust bearing oil supply device of the present invention, even when the rotational speed of the rotary shaft is small, such as when the engine is started or when the engine is under low load, the lubricating oil having high viscosity is slidably contacted with the thrust bearing. Therefore, the bearing loss can be reduced, and the supercharger performance can be improved.

It is the figure which showed the supercharger which comprised the oil supply apparatus of the thrust bearing which concerns on 1st Embodiment of this invention, (a) is a longitudinal cross-sectional view of a supercharger, (b) is the principal part sectional drawing. It is. It is a longitudinal cross-sectional view of the supercharger which comprised the oil supply apparatus of the thrust bearing which concerns on 2nd Embodiment of this invention. It is a longitudinal cross-sectional view of the supercharger which comprised the oil supply apparatus of the thrust bearing which concerns on 3rd Embodiment of this invention. It is a longitudinal cross-sectional view of the supercharger which comprised the oil supply apparatus of the thrust bearing which concerns on 4th Embodiment of this invention. It is the longitudinal cross-sectional view which showed the inner side bearing which concerns on 5th Embodiment of this invention. It is the II-II sectional view taken on the line of FIG. It is a partial expanded longitudinal cross-sectional view of the rotating shaft which should support a thrust bearing.

Hereinafter, an embodiment of an oil supply device for a thrust bearing according to the present invention will be described with reference to the drawings.
[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a view showing an exhaust turbine supercharger (hereinafter simply referred to as “supercharger”) 1 provided with a thrust bearing oiling device according to a first embodiment of the present invention. FIG. 1 is a cross-sectional view of the supercharger 1 shown in FIG. 1, and FIG.
As shown in FIG. 1, a thrust bearing 5 that receives an axial thrust force is provided in the housing 2 of the supercharger 1. The rotary shaft 3 is provided with a disk-shaped thrust collar 4, and the thrust collar 4 and the thrust bearing 5 are in sliding contact.

  The supercharger 1 is mounted on a marine diesel engine (not shown), for example, and compressed air is supplied to an air supply manifold (not shown) communicating with the inside of a cylinder liner (not shown) constituting the marine diesel engine. It is a ship exhaust turbine supercharger to be supplied. The supercharger 1 guides exhaust of the engine to rotate the turbine, rotates the compressor with the obtained rotational force to compress and compress air, and supplies an air-fuel mixture having a higher supply pressure to the engine.

  The supercharger 1 includes an oil supply device 6 that supplies lubricating oil to the thrust bearing 5. As shown in FIG. 1A, the oil supply device 6 is provided above the rotating shaft 3, and includes a head tank 7 that temporarily stores lubricating oil, a bottom portion of the head tank 7, and a thrust bearing 5. And a second lubricating oil passage 11 for supplying lubricating oil to the thrust bearing 5 and a second lubricating oil passage for guiding the lubricating oil that has lubricated the thrust bearing 5 to the oil supply tank 8. 12, a pump 10 that is disposed in the second lubricating oil flow path 12 and pumps up the lubricating oil into the oil supply tank 8, and a third lubricating oil flow path 13 that extends from the oil supply tank 8 to the thrust bearing 5. .

Lubricating oil is supplied to the sliding contact surface 18 between the thrust bearing 5 and the thrust collar 4 by the oil supply device 6 in order to smooth the rotational sliding therebetween. The lubricating oil stored in the head tank 7 is supplied from the head tank 7 via the first lubricating oil flow path 11.
An oil heater (temperature adjusting means) 9 for controlling the temperature of the lubricating oil stored in the head tank 7 is disposed on the side surface of the head tank 7. An electric heater is preferably used as the oil heater 9.

The lubricating oil that has lubricated the thrust bearing 5 is pumped up by the pump 10 disposed in the second lubricating oil flow path 12 and guided to the oil supply tank 8. Thereafter, the lubricating oil is provided above the rotating shaft 3 and guided to the head tank 7 that temporarily stores the lubricating oil through the third lubricating oil flow path 13.
In this way, the lubricating oil circulates in the oil supply device 6.

In addition, the oil supply device 6 is provided with a sensor 15 that detects the number of rotations of the rotating shaft 3. When the number of rotations of the rotating shaft 3 is detected by the sensor 15, the controller is configured based on the number of rotations. The temperature of the lubricating oil is controlled by adjusting the energization to the oil heater 9 so that the lubricating oil in the head tank 7 is at an appropriate temperature.
For example, when it is detected that the rotational speed of the rotary shaft 3 is equal to or less than a predetermined reference value, energization to the oil heater 9 is started and control is performed to increase the temperature of the lubricating oil in the head tank 7. .
In general, since the viscosity of the lubricating oil decreases as the temperature rises, the lubricating oil having a low viscosity is supplied to the sliding contact surface 18 of the thrust bearing 5 when the rotating shaft 3 is at a low speed. For this reason, the thrust bearing 5 can be reliably lubricated, bearing loss (sliding loss) can be reduced, and reduction in supercharging pressure can be prevented.

  When it is detected that the rotational speed of the rotary shaft 3 is equal to or higher than a predetermined reference value, the oil heater 9 is turned off to stop energization, and the temperature of the lubricating oil in the head tank 7 does not increase any more. To be controlled. For this reason, it can adjust so that the thrust bearing 5 may not become more than heat-resistant temperature at the time of sliding contact.

[Second Embodiment]
Hereinafter, a second embodiment of the present invention will be described with reference to FIG. FIG. 2 is a cross-sectional view of a supercharger 1 equipped with an oil supply device for a thrust bearing according to a second embodiment of the present invention.
In the second embodiment, only the characteristic parts compared to the first embodiment will be described, and the same reference numerals as those in the first embodiment are assigned to the same parts as those in the first embodiment. There will be no redundant explanation for them.

In the oil supply device 6 of the second embodiment, as shown in FIG. 2, the oil heater 9 is disposed in the third lubricating oil flow path 13.
Similarly to the first embodiment, in the oil supply device 6 of the second embodiment, when the rotational speed of the rotary shaft 3 is detected by the sensor 15, the oil is set so that the lubricating oil has an appropriate temperature based on the rotational speed. The energization to the heater 9 is adjusted, and the temperature of the lubricating oil flowing in the third lubricating oil flow path 13 is controlled.

In the present embodiment, since the oil heater 9 is disposed in the third lubricating oil flow path 13, the installation area of the oil heater 9 can be reduced as compared with the first embodiment disposed in the head tank 7. Can do.
Since other operations and effects are the same as those of the first embodiment, the description thereof is omitted here.

[Third Embodiment]
Hereinafter, a third embodiment of the present invention will be described with reference to FIG. FIG. 3 is a cross-sectional view of a supercharger 1 equipped with an oil supply device for a thrust bearing according to a third embodiment of the present invention.
In the third embodiment, only the characteristic portions compared to the first embodiment will be described, and the same reference numerals as those in the first embodiment are assigned to the same components as those in the first embodiment. These are not described repeatedly.

  As shown in FIG. 3, the oil supply device 6 of the third embodiment includes a recirculation flow path 14 for recirculating the lubricating oil after the thrust bearing 5 is lubricated to the thrust bearing 5, and the recirculation flow path 14. And a recirculation flow rate control valve 16 for controlling the flow rate of the lubricating oil flowing through the cylinder. The third lubricating oil flow path 13 that connects the oil supply tank 8 and the head tank 7 is provided with a lubricating oil flow rate control valve 17.

  The lubricating oil after lubricating the thrust bearing 5 flows into the recirculation flow path 14 that branches in the middle of flowing down the second lubricating oil flow path 12. The recirculation flow path 14 is provided with a pump 10 that pumps up lubricating oil and a recirculation flow rate control valve 16 that controls the flow rate of the lubricating oil flowing through the recirculation flow path 14.

In the circulation process, the lubricating oil that has passed through the thrust bearing 5 is heated using heat obtained from the exhaust gas as a heat source.
When the sensor 15 detects that the rotating shaft 3 is at a low speed, the recirculation flow rate control valve 16 is opened, and the heated lubricating oil is sent directly to the head tank 7. The heated lubricating oil is supplied to the thrust bearing 5 via the first lubricating oil passage 11.

  When the sensor 15 detects that the rotating shaft 3 is at a high speed, the recirculation flow rate control valve 16 is closed, and the lubricating oil is sent to the oil supply tank 8 via the second lubricating oil passage 12. The lubricating oil is sufficiently cooled while being stored in the oil supply tank 8. Then, the lubricating oil flow rate control valve 17 disposed in the third lubricating oil flow path 13 is opened, and the sufficiently cooled lubricating oil is sent to the head tank 7 and then passed through the first lubricating oil flow path 11. Thus, the thrust bearing 5 is supplied.

  As described above, when the rotational speed of the rotary shaft 3 is equal to or less than the predetermined reference value, the sliding contact surface 18 of the thrust bearing 5 is supplied with the lubricating oil whose viscosity is lowered by heating. . For this reason, the thrust bearing 5 can be reliably lubricated, bearing loss (sliding loss) can be reduced, and reduction in supercharging pressure can be prevented. Further, when the rotational speed of the rotary shaft 3 is equal to or greater than a predetermined reference value, the sufficiently cooled lubricating oil is supplied to the sliding contact surface 18 of the thrust bearing 5. It is possible to prevent the thrust bearing 5 from exceeding the heat resistant temperature.

[Fourth Embodiment]
Hereinafter, a fourth embodiment of the present invention will be described with reference to FIG. FIG. 4 is a cross-sectional view of a supercharger 1 equipped with an oil supply device for a thrust bearing according to a fourth embodiment of the present invention.
In the fourth embodiment, only the characteristic parts compared to the above-described embodiment will be described, and parts having the same structure as those described above are denoted by the same reference numerals as those in the above-described embodiments. A duplicate description thereof will be omitted.

  As shown in FIG. 4, the oil supply device 6 of the fourth embodiment is provided with an oil heater 9 for heating the lubricating oil on the side surface of the head tank 7, and the lubricating oil after the thrust bearing 5 is lubricated. The recirculation flow path 14 for recirculating the oil to the thrust bearing 5 and the recirculation flow rate control valve 16 for controlling the flow rate of the lubricating oil flowing through the recirculation flow path 14 are provided.

In the fourth embodiment, when it is detected that the rotational speed of the rotary shaft 3 is equal to or less than a predetermined reference value, a command signal is sent to the oil heater 9 and the recirculation flow rate control valve 16, and the oil heater 9 Thus, in addition to being controlled to raise the temperature of the lubricating oil in the head tank 7, the recirculation flow rate control valve 16 is opened so that the heated lubricating oil is sent directly to the head tank 7. The heated lubricating oil is supplied to the thrust bearing 5 via the first lubricating oil passage 11.
For this reason, since the lubricating oil is heated using the heat obtained from the oil heater 9 and the exhaust gas as a heat source, the lubricating oil can be heated more efficiently.

  In the present embodiment, the oil heater 9 is disposed on the side surface of the head tank 7. However, the oil heater 9 is disposed in the third lubricating oil flow path 13 as necessary (see the second embodiment). 2), and those disposed on both the side surface of the head tank 7 and the third lubricating oil passage 13 can be similarly applied.

[Fifth Embodiment]
Hereinafter, the principal part of the thrust bearing 5 which concerns on 5th Embodiment of this invention is shown in FIGS.
FIG. 5 is a sectional view showing an inner bearing 19 according to the fifth embodiment of the present invention, and FIG. 6 is a sectional view taken along line II-II in FIG. FIG. 7 is a partially enlarged longitudinal sectional view of the rotary shaft 3 that should support the thrust bearing 5.
As shown in FIG. 5, a thrust bearing 5 that receives an axial thrust force is provided. Further, the rotary shaft 3 is provided with a disk-shaped thrust collar 4, and the thrust collar 4 and the thrust bearing 5 are in sliding contact.

As shown in FIG. 5, the thrust bearing 5 is divided into an inner bearing 19 on the inner peripheral side and an outer bearing 20 on the outer peripheral side.
The inner bearing 19 is arranged so as to be positioned closer to the thrust collar 4 than the outer bearing 20 by being urged by an elastic member 23 such as a spring.

  As shown in FIG. 6, the inner bearing 19 is formed with a plurality of inner peripheral pads 21 in a region that is slidably contacted with the thrust collar 4 along the circumferential direction of the rotary shaft 3. These inner peripheral pads 21 are provided at regular intervals in the circumferential direction. Further, a taper portion 24 and a flat portion 25 are provided on the surface of each inner peripheral pad 21. And between the adjacent inner peripheral pad 21 and the taper part 24, the oil supply path 26 for supplying lubricating oil, and the supplied lubricating oil to the sliding contact surface 18 of the thrust bearing 5 and the thrust collar 4 are provided. An oil supply groove 27 is provided.

  As shown in FIG. 7, the taper portion 24 is provided forward of the thrust collar 4 in the rotation direction with respect to the oil supply passage 26, and the distance from the side surface of the thrust collar 4 gradually decreases as the thrust collar 4 rotates. Is formed. Further, the flat portion 25 is formed so as to face the taper portion 24 in the rotational direction of the thrust collar 4 and to be spaced apart from the side surface of the thrust collar 4 in parallel.

  In the thrust bearing 5 configured as described above, the lubricating oil supplied to the space through the oil supply passage 26 flows in the same direction so as to be pulled by the thrust collar 4 that rotates integrally with the rotary shaft 3. Arise. The lubricating oil that has caused the flow increases its pressure by gradually reducing the distance between the thrust collar 4 and the tapered portion 24, and generates thrust in the axial direction of the rotary shaft 3 with respect to the thrust collar 4. ing. In such a thrust bearing 5, the thrust collar 4 is slightly separated from the thrust bearing 5 by using this thrust, and receives a load acting on the rotary shaft 3 without generating a large friction.

In the thrust bearing 5 according to the fifth embodiment, when the rotational speed of the rotary shaft 3 is small, the thrust force that pushes the thrust collar 4 in the direction of the rotary shaft 3 is small. Only slidably contacts the thrust collar 4.
When the rotational speed of the rotary shaft 3 is large, the thrust force is increased to overcome the elastic force of the elastic member 23 and press the inner bearing 19, and in addition to the inner peripheral pad 21 of the inner bearing 19, the outer periphery of the outer bearing 20. The pad 22 is in sliding contact with the thrust collar 4.

  As described above, according to the fifth embodiment, when the thrust force applied to the thrust bearing 5 is less than the predetermined value, only a part of the inner peripheral pad 21 of the thrust bearing 5 is in sliding contact with the thrust collar 4. It is possible to reduce the sliding loss of the thrust bearing 5 at a low speed when the rotational speed of the shaft 3 is small. Further, at the time of high speed at which the thrust force applied to the thrust bearing 5 exceeds a predetermined value, the outer peripheral pad 22 of the outer bearing 20 in addition to the inner peripheral pad 21 of the inner bearing 19 is in sliding contact with the thrust collar 4. The area increases, and bearing loss can be reduced while maintaining the load capacity applied to the thrust bearing 5.

  In the present embodiment, the divided areas are two areas on the inner peripheral side and the outer peripheral side, but may be three or more areas.

2 Housing 3 Rotating shaft 4 Thrust collar 5 Thrust bearing 6 Oil supply device 7 Head tank 8 Oil supply tank 9 Oil heater (temperature adjusting means)
14 Recirculation flow path 15 Sensor 16 Recirculation flow rate control valve 18 Sliding contact surface 19 Inner bearing 20 Outer bearing 21 Inner circumferential pad 23 Elastic member

Claims (6)

A disc-shaped thrust collar that is provided on the rotating shaft and rotates integrally with the rotating shaft, and a thrust bearing that opposes the thrust collar and rotatably supports a thrust force acting in the axial direction of the rotating shaft. In the lubrication device of the thrust bearing that supplies lubricating oil to the sliding contact surface with
A sensor for detecting the rotational speed of the rotating shaft;
Temperature adjusting means for controlling the temperature of the lubricating oil supplied to the thrust bearing based on the rotational speed of the rotating shaft detected by the sensor;
An oil supply device for a thrust bearing, comprising:   2. The thrust bearing oil supply device according to claim 1, wherein the temperature adjusting unit includes an oil heater disposed on a side surface of a head tank that stores the lubricating oil. 3.   2. The thrust bearing oil supply device according to claim 1, wherein the temperature adjusting means includes an oil heater disposed in the lubricating oil flow path.   The temperature adjusting means includes a recirculation flow path for recirculating the lubricating oil after lubricating the thrust bearing to the thrust bearing, and a recirculation flow rate control valve for controlling the flow rate of the lubricating oil flowing through the recirculation flow path. The oil supply device for a thrust bearing according to any one of claims 1 to 3, wherein The thrust bearing is divided into a plurality of divided regions, the region that is in sliding contact with the thrust collar,
When the thrust force is less than a predetermined value, only a part of the divided areas are in sliding contact with the thrust collar, and when the thrust force is greater than or equal to a predetermined value, the other divided areas are in addition to the partial areas. The thrust bearing oil supply device according to any one of claims 1 to 4, wherein the lubrication device is in sliding contact with a collar. An exhaust turbine supercharger comprising the oil supply device for a thrust bearing according to any one of claims 1 to 5.

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