JP2940335B2 - Lubricating oil supply device for high-speed rotating bearings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricating oil supply device for a high-speed rotary bearing.

[0002]

2. Description of the Related Art A lubricating oil supply device for a high-speed rotary bearing having a lubricating oil chamber filled with lubricating oil and having a lubricating oil outflow passage for supplying lubricating oil to the high-speed rotary bearing is opened in the lubricating oil chamber. It is known (see Japanese Utility Model Application Laid-Open No. 3-32135).

[0003]

In the lubricating oil supply apparatus as described above, the lubricating oil outflow passage may be clogged by impurities in the lubricating oil or burrs formed on members constituting the lubricating oil passage. When the lubricating oil outflow passage is clogged, a sufficient amount of lubricating oil is not supplied to the high-speed rotating bearing, so that the high-speed rotating bearing may be deteriorated. Therefore, the lubricating oil filtered by the filter is supplied into the lubricating oil chamber so that the lubricating oil outflow passage is not clogged. However, if the lubricating oil deteriorates due to deterioration of the lubricating oil over time, sludge may accumulate in the lubricating oil passage. There is a problem that the oil outflow passage becomes clogged, and as a result, a sufficient amount of lubricating oil cannot be supplied to the high-speed rotary bearing. Also, if there is a processing burr on a member constituting the lubricating oil passage downstream of the filter, the lubricating oil outflow passage is also clogged by the processing burr, so that a sufficient amount of lubricating oil cannot be supplied to the high-speed rotating bearing. There's a problem.

[0004]

According to the present invention, a valve insertion hole is formed in a lubricating oil chamber housing disposed adjacent to a high-speed rotary bearing, and the valve insertion hole is formed in the valve insertion hole. A first oil passage and a first oil passage defining a lubricating oil chamber filled with lubricating oil by the inserted valve member, and opening a lubricating oil outflow passage for supplying lubricating oil to the high-speed rotary bearing into the lubricating oil chamber. And a second passage communicable with the lubricating oil chamber housing, the coefficient of thermal expansion of the material forming the valve member being smaller than the coefficient of thermal expansion of the material forming the lubricating oil chamber housing. When the temperature is lower than a predetermined set temperature, the valve member is fixedly held at a position for closing the second passage, and when the temperature of the lubricating oil chamber housing becomes higher than the set temperature, the lubricating oil chamber housing and Heat with valve member So that the second passage is made to communicate with the lubricating oil chamber by Chosa.

[0005]

When the temperature of the lubricating oil chamber housing is lower than the set temperature, since the second passage is closed by the valve member, a sufficient amount of lubricating oil is supplied to the high-speed rotating bearing via the first passage. Supplied. When a sufficient amount of lubricating oil is not supplied to the high-speed rotating bearing via the first passage, the temperature of the high-speed rotating bearing increases, and the temperature of the lubricating oil chamber housing and the valve member disposed adjacent to the high-speed rotating bearing also increases. Rise. Due to the difference in thermal expansion between the lubricating oil chamber housing and the valve member, when the temperature of the lubricating oil chamber housing becomes higher than the set temperature, the valve member separates from the position where the second passage is closed.
Are communicated with the lubricating oil chamber.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, reference numeral 1 denotes a housing, 2 denotes an annular bearing holder fixed at a proper position in the housing 1, and 3 denotes a bearing arranged in a bearing chamber 4 in the bearing holder 2. Indicates a high-speed rotation axis. The bearing 3 that supports the high-speed rotating shaft 5 is made up of a rolling bearing, and this rolling bearing 3 is made up of an outer ring 3a, a rolling element 3b, and an inner ring 3c. The high-speed rotation shaft 5 rotates around the rotation axis KK and is, for example, an output shaft of a gas turbine.

In the embodiment shown in FIG. 1, a cylindrical valve insertion hole 6 is formed in the bearing holder 2, and the valve insertion hole 6 is disposed adjacent to the bearing chamber 4. A disc-shaped valve member 7 is inserted into the valve insertion hole 6, so that a lubricating oil chamber 8 is defined by the valve member 7 in the valve insertion hole 6. The housing 1 and the bearing holder 2 are provided in the lubricating oil chamber 8.
The lubricating oil is supplied through a lubricating oil supply passage 9 formed therein, so that the lubricating oil chamber 8 is filled with the lubricating oil. Further, a first passage 11 and a second passage 12 that constitute the lubricating oil outflow passage 10 are formed in the bearing holder 2. When the lubricating oil outflow passage 10 opens into the lubricating oil chamber 8, the lubricating oil chamber 8 and the bearing chamber 4 communicate with each other via the lubricating oil outflow passage 10, and the lubricating oil in the lubricating oil chamber 8 flows into the bearing chamber 4. I will be. The lubricating oil flowing into the bearing chamber 4 is discharged from the bearing chamber 4 through the lubricating oil discharge passage 13.

As shown in FIG. 1, a plug 14 is fitted to the upper end of the valve insertion hole 6, and the plug 14 ensures the hermeticity of the lubricating oil chamber 8. A compression spring 1 for urging the valve member 7 downward is provided in a lubricating oil chamber 8 between the valve member 7 and the plug 14.
5 are arranged. Further, seal members 16 and 17 are arranged between the housing 1 and the bearing holder 2, and the seal members 16 and 17 prevent the lubricating oil from leaking outside.

Further, in the embodiment according to the present invention, the valve member 7 is provided.
Is formed from a material having a low coefficient of thermal expansion such as cast iron or ceramics, whereas the bearing holder 2 and the plug 14 constituting the lubricating oil chamber housing are formed from a material having a high coefficient of thermal expansion such as aluminum or magnesium. That is, these materials are selected such that the coefficient of thermal expansion of the material forming the valve member 7 is smaller than the coefficient of thermal expansion of the material forming the lubricating oil chamber housing. further,
Bearing holder 2 and plug 1 constituting lubricating oil chamber housing
4 is desirably formed from a high thermal conductivity material.

Next, a method of supplying lubricating oil to the high-speed rotary bearing 3 according to the present embodiment will be described with reference to FIG. FIG. 2A shows a set temperature at which the temperature of the bearing holder 2 is determined by the difference in the coefficient of thermal expansion between the bearing holder 2 and the valve member 7 (described later).
FIG. 2B shows a case where the temperature of the bearing holder 2 has become higher than a set temperature.

In the embodiment shown in FIG. 1, the valve member 7 is opened when the valve member 7 is inserted into the valve insertion hole 6, that is, when the temperature of the bearing holder 2 is lower than a set temperature (described later). 7 is machined and formed such that the outer diameter is equal to the inner diameter of the valve insertion hole 6 or slightly larger than the inner diameter of the valve insertion hole 6. Therefore, when the temperature of the bearing holder 2 is lower than the set temperature, the valve member 7 is fitted into the valve insertion hole 6, and as a result, the valve member 7 is fixed and held in the valve insertion hole 6. At this time, the valve member 7 secures the opening of the first passage 11 into the lubricating oil chamber 8 as shown in FIG.
The passage 12 is fixedly held at a position where the passage 12 is prevented from opening into the lubricating oil chamber 8. Therefore, when the temperature of the bearing holder 2 is lower than the set temperature, the lubricating oil in the lubricating oil chamber 8
In (A), the fluid flows out into the bearing chamber 4 through the first passage 11 as indicated by an arrow L1. As a result, a sufficient amount of lubricating oil can be supplied to the bearing 3.

By the way, in the lubricating oil chamber 8, sludge generated due to deterioration of the lubricating oil with time may be accumulated. As shown in FIG. 2B, when the oil-insoluble sludge 18 flows into the first passage 11, the first passage 11 becomes clogged. When the first passage 11 is clogged, a sufficient amount of lubricating oil is not supplied into the bearing chamber 4, so that the temperature of the bearing 3 increases. When the temperature of the bearing 3 rises, the temperature of the bearing holder 2 also rises because the bearing 3 is in contact with the inner wall surface 2a of the bearing holder 2 via the lubricating oil film. Further, the temperature of the valve member 7 fitted into the valve insertion hole 6 in the bearing holder 2 also increases. Therefore, the bearing member 2 thermally expands and the valve member 7 also thermally expands. However, at this time, since there is a difference in thermal expansion between the bearing holder 2 and the valve member 7, the valve insertion hole 6
Of the valve member 7 is larger than the outer diameter of the valve member 7, that is, as shown in FIG.
A gap d is formed between the outer peripheral surfaces, and in the embodiment shown in FIG. 1, since the valve member 7 is urged downward by the compression spring 15, it is separated from the fixed position shown in FIG. As a result, the second passage 12 opens into the lubricating oil chamber 8. In the embodiment according to the present invention, as described above, the temperature of the bearing holder 2 when the second passage 12 starts opening into the lubricating oil chamber 8 is referred to as a set temperature. It depends on the difference in the coefficient of thermal expansion with the member 7.
When the second passage 12 opens into the lubricating oil chamber 8, the lubricating oil in the lubricating oil chamber 8 flows out into the bearing chamber 4 via the second passage 12,
As a result, a sufficient amount of lubricating oil is supplied to the bearing 3.

According to the embodiment of the present invention, as described above, the bearing 3 is provided without providing a complicated and expensive sensor or the like.
When the lubricating oil amount is insufficient, the sufficient amount of lubricating oil cannot be supplied to the bearing 3 through the second passage 12 without providing a complicated and expensive switching valve. Lubricating oil can be supplied. Also,
The valve member 7 is formed by forming the stopper 14 from a transparent material.
In the valve insertion hole 6 can be confirmed. For this reason,
For example, when it is confirmed that the second passage 12 is open in the lubricating oil chamber 8, the bearing holder 2 is replaced so that the second passage 12 is clogged and lubricating oil in the bearing 3 becomes insufficient. Can be blocked. When the plug 14 is formed from a material different from that of the bearing holder 2, the plug 14
Is required to be larger than the coefficient of thermal expansion of the material forming the bearing holder 2.

[0014]

When the amount of lubricating oil supplied to the bearing is insufficient, the temperature of the bearing rises, the temperature of the lubricating oil chamber housing and the valve member also rises, and the lubricating oil chamber housing and the valve member thermally expand. At this time, when the temperature of the lubricating oil chamber housing becomes higher than the set temperature, the second passage forming the lubricating oil supply passage opens into the lubricating oil chamber due to a difference in thermal expansion between the lubricating oil chamber housing and the valve member. Can be supplied with a sufficient amount of lubricating oil.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of a lubricating oil supply device for a high-speed rotary bearing according to an embodiment.

FIG. 2 is a partially enlarged cross-sectional view of a lubricating oil supply device for the high-speed rotating bearing of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 2 ... Bearing holder 3 ... Bearing 5 ... High-speed rotating shaft 6 ... Valve insertion hole 7 ... Valve member 8 ... Lubricating oil chamber 10 ... Lubricating oil outflow passage 11 ... 1st passage 12 ... 2nd passage

Claims (1)

(57) [Claims] 1. A lubricating oil chamber filled with lubricating oil by a valve member inserted in the lubricating oil chamber housing disposed adjacent to the high-speed rotary bearing. Forming a lubricating oil outflow passage for supplying lubricating oil to the high-speed rotating bearing by a first passage opening into the lubricating oil chamber and a second passage communicable with the lubricating oil chamber to form the valve member; When the temperature of the lubricating oil chamber housing is lower than a predetermined set temperature by making the coefficient of thermal expansion of the material to be made smaller than the thermal expansion coefficient of the material forming the lubricating oil chamber housing, the valve member is moved to the second position. When the temperature of the lubricating oil chamber housing is higher than the set temperature and the temperature of the lubricating oil chamber housing is higher than the set temperature, the second passage is connected to the lubricating oil chamber due to a difference in thermal expansion between the lubricating oil chamber housing and the valve member. So that they can communicate Lubricating oil supply device for high-speed rotating bearings.