JP6238152B2 - Bearing device - Google Patents

Description

  The present invention relates to a bearing device.

  A lubricant is usually supplied to the bearing. Lubricating grease may be used as the lubricant.

  The bearing may be used in a high temperature environment. Lubricating grease that has a viscosity suitable for lubrication under a high temperature environment is used for the bearing used under a high temperature environment. That is, a lubricating grease having a relatively high viscosity is used. However, when such lubricating grease is used, there may be a case where a sufficient lubricating action cannot be obtained when used in a low temperature environment (for example, immediately after the start of use).

  In relation to the above, Patent Document 1 (Japanese Patent Application Laid-Open No. 2007-146811) discloses a start control method for a gas turbine engine. In Patent Document 1, when a gas turbine engine is started, a lubricating oil is supplied to a starter motor and a high-speed bearing of an output shaft of the engine by driving a lubricating oil pump for a predetermined time after inputting a start signal. The point that the starter motor is started after being stopped once and then the driving of the lubricating oil is restarted, and the point that the engine speed is smoothly increased while suppressing the bearing loss of the output shaft are disclosed. .

JP 2007-146811 A

  An object of the present invention is to provide a bearing device capable of obtaining a sufficient lubricating action in both a low temperature environment and a high temperature environment.

  A bearing device according to the present invention includes an annular outer race, an annular inner race disposed between the outer race, an inner race, an inner race, an inner race, and an inner race. A first lubricant disposed between the outer race and a second lubricant disposed between the inner race and the outer race;

  According to the present invention, it is an object of the present invention to provide a bearing device capable of obtaining a sufficient lubricating action in both a low temperature environment and a high temperature environment.

FIG. 1 is a schematic view showing a jet engine. FIG. 2 is a schematic sectional view showing the bearing device.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
In the present embodiment, a bearing device used for a jet engine will be described. FIG. 1 is a schematic view showing a jet engine 2. The jet engine 2 is provided with a shaft 3. The shaft 3 is rotatably supported by the bearing device 4 according to the present embodiment.

  FIG. 2 is a schematic sectional view showing the bearing device 4. As shown in FIG. 2, the bearing device 4 includes an outer race 5, an inner race 7, a rolling element 6, a shield member 9, a first lubricant 10, and a second lubricant 11.

  Each of the inner race 7 and the outer race 5 is annular. The outer race 5 is supported by a body structure (not shown). The inner race 7 is disposed inside the outer race 5. The outer peripheral surface of the inner race 7 and the inner peripheral surface of the outer race 5 are opposed to each other with the rolling element 6 interposed therebetween. A shaft 3 is passed through the inner race 7. The shaft 3 is rotatably supported by the inner race 7.

  The rolling element 6 is spherical. However, cylindrical rollers may be used as the rolling elements 6. By providing the rolling elements 6, the inner race 7 can rotate around the central axis.

  The shield member 9 is provided between the inner race 7 and the outer race 5 so as to cover the rolling elements 6. The shield member 9 is fixed to the outer race 5 by a stopper 8. The shield member 9 is provided for the purpose of protecting the rolling elements 6, the outer peripheral surface of the inner race 7, the inner peripheral surface of the outer race 5, and the like.

  The first lubricant 10 is disposed between the inner race 7 and the outer race 5. Specifically, the first lubricant 10 is disposed in a holding portion provided inside the shield member 9. The first lubricant 10 is provided to obtain a lubricating action under a high temperature environment, and contains a high temperature lubricating grease.

  The second lubricant 11 is also disposed between the inner race 7 and the outer race 5. Specifically, the second lubricant 11 is disposed (applied) on the surface of the rolling element 6. The second lubricant 11 is provided for obtaining a lubricating action in a low temperature environment immediately after the jet engine 2 is started, and is a low temperature lubricant. Here, the low temperature lubricant is a lubricant having a small rotational resistance compared to a high temperature lubricating grease having a high viscosity when compared at room temperature.

  In the present embodiment, the jet engine 2 starts in a low temperature environment, and the shaft 3 and the inner race 7 rotate. At this time, a lubricating action is obtained by the second lubricant 11, and the rotational resistance of the bearing device 4 is suppressed. On the other hand, during normal operation, the bearing device 4 is placed in a high temperature environment due to frictional resistance and combustion heat generated by the jet engine 2. Under a high temperature environment, the viscosity of the first lubricant 10 becomes small. As a result, the first lubricant 10 flows out (supplied) to the sliding portion of the bearing device 4 to obtain a lubricating action.

  A lubricant suitable for a low temperature environment is not suitable for lubrication because it is easily decomposed under a high temperature environment or its viscosity becomes too low. Therefore, when only a low temperature lubricant is used, a sufficient lubricating action cannot be obtained during normal operation (in a high temperature environment). On the other hand, a lubricating grease suitable for a high temperature environment has a viscosity that is too high in a low temperature environment and increases the rotational resistance. On the other hand, in this embodiment, a lubricating action is obtained by the second lubricant 11 in a low temperature environment, and a lubricating action is obtained by the first lubricant 10 in a high temperature environment. Therefore, it is possible to obtain a sufficient lubricating action both in a low temperature environment and in a high temperature environment.

  In the present embodiment, the case where the bearing device 4 is used in the jet engine 2 has been described. The temperature of the internal parts of the jet engine 2 has a large temperature difference between starting and operation. The present embodiment can be suitably applied to the jet engine 2 because a sufficient lubricating action can be obtained both in a low temperature environment and in a high temperature environment. However, it is also possible to use the bearing device 4 for other purposes.

(Second Embodiment)
Subsequently, a third embodiment will be described. In the present embodiment, the second lubricant 11 contains a rust preventive oil. Since other points can be the same as those in the first embodiment, a detailed description thereof will be omitted.

  When the rolling element 6 is made of metal, rust may be a problem. According to this embodiment, since the 2nd lubricant 11 contains antirust oil, even if the rolling element 6 is metal, rust can be prevented. Furthermore, since rust preventive oil can be used as a lubricant, the cost spent on the lubricant can be reduced.

  In addition, as a rust prevention oil, it is possible to use a petrolatum dispersion type solvent dilution type rust prevention oil, for example.

(Third embodiment)
Subsequently, a third embodiment will be described. In the present embodiment, the second lubricant 11 is a solid lubricant. Since the other points can be the same as those in the second embodiment, detailed description thereof is omitted.

  In the second embodiment, rust preventive oil and lubricating grease must be applied, which complicates the application process. On the other hand, in this embodiment, a solid lubricant is used as the second lubricant 11. Therefore, the application process of the second lubricant 11 can be omitted, and the manufacturing cost can be reduced. Further, a grease that has an appropriate viscosity at the temperature during operation may be selected as the first lubricating grease, and the cost spent on the lubricant can be reduced.

  For example, molybdenum disulfide, graphite, or the like can be used as the solid lubricant.

  The present invention has been described above using the first to third embodiments. Note that these embodiments are not independent and can be used in combination within a consistent range.

DESCRIPTION OF SYMBOLS 2 Jet engine 3 Shaft 4 Bearing apparatus 5 Outer race 6 Rolling element 7 Inner race 8 Stopper 9 Shield member 10 1st lubricant 11 2nd lubricant

Claims (3)

An annular outer race,
An inner race, which is annular and arranged inside the outer race;
A rolling element disposed between the inner race and the outer race;
A shield member provided between the inner race and the outer race so as to cover the rolling element, and a concave portion formed outward from the center of the rolling element on the surface of the rolling element;
A first lubricant disposed in the recess of the shield member so as not to contact the rolling element;
A second lubricant disposed on the surface of the rolling element in a low temperature environment;
Comprising
The first lubricant Ri lubricants der for high temperature than the second lubricant,
The first lubricant is lubricating grease;
The bearing device is a solid lubricant . The bearing device according to claim 1,
The first lubricant is lubricating grease;
The bearing device, wherein the second lubricant is a rust preventive oil. The bearing device according to claim 1 or 2 ,
The inner race is a bearing device configured to support a shaft included in a jet engine.

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