JPH0932859A - Lubricating device for rolling bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent occurrence of seizure of a tapered roller bearing under the state that lubricating oil supply is suspended for a short time. SOLUTION: Lubricating oil is fed in a direction of an arrow α, and taken in a recession 16. The lubricating oil taken in the recession 16 is fed in a tapered roller bearing 10 from a supply port 20. Even when supply of the lubricating oil indicated by the arrow α is suspended for a short time, the minimum lubrication can be secured by the lubricating oil remaining in the recession 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The lubrication device for rolling bearings according to the present invention is used in a state in which it is incorporated in a rotary support portion of a rotary shaft of a mechanical device such as an aircraft or an automobile which is used in a state where a complicated force is applied. .

[0002]

2. Description of the Related Art In order to rotatably support a rotary shaft 1 inside a housing 2, a structure as shown in FIG. 4 has been generally known. Rolling bearings 3, 3 are provided between two positions of the intermediate portion of the outer peripheral surface of the rotary shaft 1 and two positions of the intermediate portion of the outer peripheral surface of the housing 2. Further, an oil sump 4 is provided at the bottom of the housing 2, and the lubricating oil 5 stored in this oil sump 4 portion can be taken out by the pump 6 through the suction hole 8. The lubricating oil 5 taken out by the pump 6 is discharged into the housing 2 through a discharge hole 7 provided in the upper portion of the housing 2 and poured into the rolling bearings 3, 3. As a result, these rolling bearings 3, 3 are lubricated. In particular, when each of the rolling bearings 3 and 3 is a tapered roller bearing, the rolling bearings 3 and 3 themselves have a pumping action for circulating the fluid in the axial direction. Good uptake.

[0003]

The rolling bearing lubrication device configured as described above for lubricating the rolling bearings 3 and 3 is particularly preferable if a sufficient amount of lubricating oil 5 is present in the oil sump 4 portion. Does not cause a problem. On the other hand, when the amount of the lubricating oil 5 existing in the oil sump 4 portion decreases, the lubricating oil 5 supplied to the rolling bearings 3 and 3 may be insufficient depending on the usage state. That is, when a centrifugal force is applied to the lubricating oil 5 stored in the oil sump 4 as the course of an aircraft or an automobile provided with the rotating shaft 1 is changed, the lubricating oil 5 is communicated with the pump 6 depending on the direction of the centrifugal force. The lubricating oil 5 may not exist in the suction hole 8 portion.

As described above, when the lubricating oil 5 does not exist in the suction hole 8 portion, the discharge of the lubricating oil 5 from the discharge hole 7 is temporarily interrupted, and the lubricating oil 5 to each of the rolling bearings 3 and 3 is temporarily stopped. Supply is cut off. Although the supply of the lubricating oil 5 is stopped only for a short time due to such a cause, if the rotary shaft 1 continues to rotate at a high speed during that time, damage such as seizure occurs on each of the rolling bearings 3 and 3. there is a possibility. If the rolling bearings 3 and 3 are ball bearings, the time from the supply of the lubricating oil to serious damage such as seizure is relatively long, but this time is short in the case of roller bearings, especially tapered roller bearings. Therefore, correspondence is desired.

In view of such circumstances, conventionally, as disclosed in, for example, Japanese Patent Laid-Open No. 54-89147, by devising the shapes of rolling elements and races, it is important in the case of poor lubrication. Attempts have been made to lengthen the time to damage. However, the above time cannot be sufficiently lengthened simply by devising the shapes of the rolling elements and the bearing rings. In view of such circumstances, the rolling bearing lubrication apparatus of the present invention has damages such as seizure on each of the rolling bearings 3 and 3 when the lubrication oil supply from the lubrication oil supply means such as the pump 6 is stopped for a short time. The invention was invented in order to prevent the occurrence of.

[0006]

The rolling bearing lubrication device of the present invention is similar to the above-described conventional rolling bearing lubrication device in that it has a housing having an inner peripheral surface and an outer peripheral surface. A relative rotating shaft, a rolling bearing provided between the inner peripheral surface and the outer peripheral surface, and lubricating oil supply means for pouring lubricating oil toward the rolling bearing are provided.

In particular, the rolling bearing lubricating device of the present invention includes an oil retaining space, a collecting passage, and an oil supply hole. The oil-retaining space is provided adjacent to the rolling bearing and has a volume capable of holding sufficient lubricating oil to lubricate the rolling bearing for a short time. Further, one end of the collection passage is opened at a position where the lubricating oil poured from the lubricating oil supply means can be received, and the other end is opened at the oil retaining space. Further, the oil supply hole has one end opened to the oil retaining space and the other end opened to a position facing the rolling element installation portion constituting the rolling bearing.

Preferably, the area of the collecting passage is larger than the area of the oil supply hole. The reason for this is that the amount of lubricating oil taken into the oil retaining space from the collection passage tends to be larger than the amount of lubricating oil discharged from the oil supply hole. With this configuration, as long as the amount of lubricating oil poured from the lubricating oil supply means toward the rolling bearing is sufficient, a sufficient amount of lubricating oil is always stored in the oil retaining space. It becomes the state of.

Further, the oil retaining space, the collecting passage, and the oil supply hole as described above are formed on the inner peripheral surface portion of the housing integrally with the housing, or of the outer ring or the inner ring forming the rolling bearing. The axial end surface may be formed integrally with the outer ring or the inner ring. Furthermore, by fitting and fixing an annular member formed separately from any member of the housing, the outer ring, and the inner ring to any one of these members, the oil retaining space, the collecting passage, and the oil supply hole are formed. It can also be configured.

[0010]

The lubricating device for a rolling bearing according to the present invention having the above-described structure operates in the following manner to constantly supply the lubricating oil to the rolling bearing. If the amount of lubricating oil poured from the lubricating oil supply means to the rolling bearing is sufficient, part of this lubricating oil will be sent directly into the rolling bearing without passing through the oil retaining space, and this rolling oil Lubricate the bearings. The remaining part of the lubricating oil is taken into the oil retaining space through the collecting passage and sent into the rolling bearing through the oil supply hole. Therefore, the rolling bearing is sufficiently lubricated.

Next, when the amount of the lubricating oil poured from the lubricating oil supply means to the rolling bearing becomes insufficient or becomes zero, the lubricating oil taken into the oil retaining space is discharged from the oil supply hole. It is fed into the rolling bearing. As a result,
Minimal lubrication of rolling bearings. Since the amount of lubricating oil that is poured from the lubricating oil supply means to the rolling bearing becomes insufficient or becomes zero for a short period of time, damage to the rolling bearing such as seizure may occur due to the lubricating oil supply from the oil retaining space. It can be prevented from occurring. In addition, no matter how long the supply of the lubricating oil from the lubricating oil supply unit is stopped,
Whether the rolling bearing can be prevented from being damaged can be arbitrarily determined by the relationship between the volume of the oil retaining space and the area of the oil supply hole.

[0012]

1 and 2 show a first embodiment of the present invention. A fitting step portion 9 is formed in the intermediate portion of the inner peripheral surface of the housing 2, and an outer ring 11 constituting a tapered roller bearing 10 which is a type of rolling bearing is fitted and fixed to the fitting step portion 9. . An inner ring 12 that constitutes the tapered roller bearing 10 is externally fitted and fixed to the outer peripheral surface of the intermediate portion of the rotary shaft 1 that is inserted inside the housing 2. A plurality of tapered rollers 13, 13 as rolling elements are provided between the inner ring raceway formed on the outer peripheral surface of the inner ring 12 and the outer ring raceway formed on the inner peripheral surface of the outer ring 11 to provide the tapered roller bearing 10 The rotary shaft 1 is rotatably supported inside the housing 2. When the tapered roller bearing 10 rotates, a fluid containing lubricating oil, which will be described later, is caused to flow from the left side to the right side in FIG. Distribute to.

A discharge hole 7 (see FIG. 4 described above, omitted in FIG. 1) is provided on the upper surface of the central portion of the housing 2, and an oil sump 4 (FIG. 4) is also provided on the bottom surface. Then, the lubricating oil sucked from the oil sump 4 to the pump 6 (FIG. 4) can be freely discharged from the discharge hole 7. The lubricating oil discharged from the discharge hole 7 flows along the ceiling surface 14 of the housing 2 and is poured into the tapered roller bearing 10. That is,
The discharge hole 7, the oil sump 4, and the pump 6 constitute a lubricating oil supply means for pouring lubricating oil toward the tapered roller bearing 10.

An inward flange-shaped flange portion 15 is provided on a portion of the inner peripheral surface of the housing 2 adjacent to the fitting step portion 9.
However, it is formed all around. Inside the flange portion 15, a concave portion 16 that opens to one side surface (the right side surface in FIG. 1) of the flange portion 15 is formed over the entire circumference. Then, the end portion in the axial direction of the outer ring 11 constituting the tapered roller bearing 10 is brought into contact with one side surface of the flange portion 15 to thereby cause the recess 1
The end opening 6 is closed. In the case of this embodiment, the inside of the recess 16 serves as an oil retaining space.

Further, an annular protrusion 17 protruding in the axial direction is formed on the inner side half of the other side surface (left side surface in FIG. 1) of the flange portion 15.
Is formed over the entire circumference. A flat surface 18 is formed on the upper end of the annular projection 17 by planing the outer peripheral surface of the upper end of the annular projection 17 in the horizontal direction. Further, the back end of the flat surface 18 (the right end in FIG. 1) and the recess 16 are
And are connected to each other by a substantially crescent-shaped collection passage 19. The lubricating oil flowing in the direction of the arrow α in FIG. 1 along the ceiling surface 14 of the housing 2 is received by the flat surface 18, and is further fed (collected) into the recess 16 through the collecting passage 19. ).

Further, a plurality (three in the illustrated example) of oil supply holes 20, 20 are provided on the inner peripheral surface of the collar portion 15. The plurality of oil supply holes 20, 20 allow the inside of the recess 16 as an oil retaining space and the tapered roller bearing 10
A position facing the tapered roller 13, 13 installation portion constituting the above, that is, a portion near one end (left end in FIG. 1) opening of the space 21 existing between the inner peripheral surface of the outer ring 11 and the outer peripheral surface of the inner ring 12. Through. These plural oil supply holes 20, 20
One of them is formed at the lower end of the inner peripheral surface of the collar portion 15, and the remaining two oil supply holes 20, 20 are formed at the intermediate portion in the vertical direction. Further, in the illustrated embodiment, each of the oil supply holes 20 and 20 is formed in a notch shape that opens to the opening edge side of the recess 16. The open end of the notch is closed by the end surface of the outer ring 11. Of course, each of these oil supply holes 2
0 and 20 may be circular holes formed at positions apart from the opening edge.

Preferably, the area of the collecting passage 19 is made larger than the total area of the plurality of oil supply holes 20, 20. The reason for this is that the amount of lubricating oil taken into the recess 16 which is the oil retaining space from the collection passage 19 is determined by the oil supply holes 20, 2
This is because the amount of lubricating oil discharged from 0 tends to increase. With this configuration, as long as the amount of lubricating oil poured from the discharge hole 7 toward the tapered roller bearing 10 is sufficient, a sufficient amount of lubricating oil is always stored in the concave portion 16. become. However, if the lubricating oil is vigorously poured toward the collecting passage 19 and the lubricating oil is taken in efficiently by the collecting passage 19, the area of the collecting passage 19 may be slightly smaller. .

The rolling bearing lubrication device of the present invention having the above-described structure operates in the following manner to produce the tapered roller bearing 10
Always supply lubricating oil to When the amount of the lubricating oil poured from the discharge hole 7 to the tapered roller bearing 10 is sufficient, a part of this lubricating oil does not pass through the recess 16 which is the oil retaining space, and the tapered roller bearing is directly The taper roller bearing 10 is lubricated by being fed into the inside. The rest of the lubricating oil is received by the flat surface 18,
The flat surface 18 is taken into the recess 16 through a collection passage 19 continuous from the rear end. The lubricating oil taken into the recess 16 in this way is forced out of the respective oil supply holes 20, 20 by the pressure generated based on gravity.
5 is fed to the inner peripheral surface of the tapered roller bearing 10 and pumped into the tapered roller bearing 10 by the pumping action of the tapered roller bearing 10. Therefore, the tapered roller bearing 10 is sufficiently lubricated.

When the area of the collecting passage 19 is made larger than the total area of the plurality of oil supply holes 20, 20, the amount of lubricating oil poured from the discharge hole 7 to the tapered roller bearing 10 is sufficient. If so, the upper end of the recess 16 is filled with the lubricating oil. Therefore, in this state,
Only a part of the lubricating oil received on the upper surface of the flat surface 18 is taken into the recess 16 through the collecting passage 19. The lubricating oil that has not been taken into the recess 16 flows downward as it is and is fed into the tapered roller bearing 10. Although not shown in the drawings, a large-diameter main oil supply hole is provided at the upper end of the inner peripheral surface of the collar portion 15, and the collecting passage 19 is provided.
Part of the lubricating oil taken into the recess 16 from
It is also possible to feed the taper roller bearing 10 through the main oil supply hole. By doing so, the lubricating oil can be more efficiently fed to the tapered roller bearing 10 at normal times. In this case, the area of the collection passage 19 is made larger than the total area of the plurality of oil supply holes 20, 20 and the main oil supply hole.

Next, from the discharge hole 7 to the tapered roller bearing 1
When the amount of lubricating oil poured into 0 becomes insufficient or becomes zero, the lubricating oil taken into the recess 16 is fed into the tapered roller bearing 10 through the oil supply holes 20 and 20. As a result, the minimum lubrication of the tapered roller bearing 10 is performed. From the discharge hole 7 to the tapered roller bearing 10
Since the amount of lubricating oil that is poured into the tank is insufficient or becomes zero for a short time, it is possible to prevent damage such as seizure from occurring in the tapered roller bearing 10 due to the supply of lubricating oil from the recess 16. . Note that, regardless of how long the supply of the lubricating oil from the discharge hole 7 is stopped, the damage of the tapered roller bearing 10 can be prevented by determining the total area of the volume of the recess 16 and the oil supply holes 20, 20 ( Refueling holes 20, 20
The product of the area and the number of the oil supply holes 20, 20) can be arbitrarily determined. For example, in the dimensional relationship (proportion) shown in FIG. 1, if the effective diameter of the oil supply holes 20 and 20 is set to 1 mm, the tapered roller bearing 10 will be damaged even if the supply of lubricating oil is stopped for about 1 minute. It can be prevented.

It is to be noted that at least one oil supply hole 20 is required, but when only one oil supply hole 20 is provided, it is provided at the lower end portion of the inner peripheral surface of the flange portion 15. The reason is that most of the lubricating oil taken in the recess 16 is effectively used for lubricating the tapered roller bearing 10. However, the oil supply holes 20, 2
It is preferable that 0s are provided at three positions as shown. The reason for this is that the present invention was originally invented to prevent the tapered roller bearing 10 from being damaged during poor lubrication due to the action of centrifugal force. That is, when centrifugal force is applied, the lubricating oil taken into the recess 16 does not always flow downward, but flows in a direction according to the resultant force of the centrifugal force and gravity. Therefore, if the oil supply holes 20 and 20 are provided at three positions shown in the drawing, any one of the oil supply holes 2 will be irrespective of the centrifugal force.
Lubricating oil is supplied from 0 to the tapered roller bearing 10.

Next, FIG. 3 shows a second embodiment of the present invention. In the case of the present embodiment, the height dimension of the collar portion 15a formed on the inner peripheral surface of the housing 2 is smaller than that of the collar portion 15 (FIGS. 1 and 2) of the first embodiment described above. And
An annular portion 22 formed integrally with the outer ring 11 is fitted and fixed to the inner peripheral surface of the flange portion 15a. The annular portion 22, the collar portion 15a, and the outer ring 11 form a recess 16 that is an oil retaining space, a collection passage 19, and oil supply holes 20 and 20. Other configurations and operations are similar to those of the above-described first embodiment. Further, although not shown, the portion corresponding to the annular portion 22 is formed separately from the outer ring 11,
This portion and the outer ring 11 can be respectively fitted and fixed to predetermined portions of the housing 2.

[0023]

The lubricating device for a rolling bearing according to the present invention is constructed and operates as described above, and can supply a minimum amount of lubricating oil to the rolling bearing even under special conditions. It is possible to effectively prevent damage to the bearing. As a result, it is possible to contribute to the improvement of the reliability and durability of various mechanical devices incorporating the rolling bearing under severe operating conditions.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention and corresponding to the right part of FIG.

FIG. 2 is a diagram with a part omitted, as viewed from the left side of FIG.

FIG. 3 is a view similar to FIG. 1, showing a second embodiment of the present invention.

FIG. 4 is a vertical sectional view showing an example of a conventional structure.

[Explanation of symbols]

 1 Rotating Shaft 2 Housing 3 Rolling Bearing 4 Oil Reservoir 5 Lubricating Oil 6 Pump 7 Discharge Hole 8 Suction Hole 9 Fitting Step 10 Tapered Roller Bearing 11 Outer Ring 12 Inner Ring 13 Tapered Roller 14 Ceiling Surface 15, 15a Collar 16 Recess 17 Ring Protrusion 18 Flat surface 19 Collection passage 20 Oil supply hole 21 Space 22 Annular portion

Claims (1)

[Claims] 1. A housing having an inner peripheral surface, a shaft having an outer peripheral surface and rotating relative to the housing, a rolling bearing provided between the inner peripheral surface and the outer peripheral surface, and the rolling bearing. In a lubrication device for rolling bearings, which is provided with a lubricating oil supply means for pouring lubricating oil toward a roller bearing, an oil retaining space provided adjacent to the rolling bearing, and a lubricating oil poured from the lubricating oil supply means. At the position where the oil can be received, the other end in the oil retaining space, and the collection passage having the other end opened, and the one end in the oil retaining space faces the rolling element installation portion that constitutes the rolling bearing. A lubrication device for rolling bearings, characterized in that the other end is provided at a position and an oil supply hole opened respectively.