JPH11141555A - Multi-row roller bearing with lubrication hole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multi-row roller bearing equipped with lubrication holes, which allows enhancement of the lubricating performance with oil supply and also the cooling performance. SOLUTION: A multi-row roller bearing 10 equipped with a lubrication hole is structured so that rollers are arranged in two or more rows and the outer ring 13 is furnished penetratively with lubrication holes 16 and 17 for supplying oil to the rows of rollers, wherein the penetrating direction of the lubrication holes 16 and 17 is inclined to the radial direction of the outer ring 13 so that the oil stream flowing into the bearing from the holes 16 and 17 includes a common velocity component to the oil stream in the bearing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-row roller bearing having oil holes in which two or more rows of rollers are arranged, and oil holes for supplying oil to the roller rows are formed through the outer ring. More specifically, the present invention relates to an improvement for improving a cooling effect and a lubrication effect by refueling.

[0002]

2. Description of the Related Art FIGS. 7 and 8 show a conventional example of a multi-row roller bearing with oil holes which is particularly useful as a bearing for high-speed rotation. The multi-row roller bearing 1 with oil holes shown here is
The cylindrical rollers 2 are held and arranged in two rows by a retainer 8, and a lubrication guide groove 4 is provided on the outer peripheral surface of the outer ring 3 so as to be located exactly in the middle of each roller row. An oil hole 6 for supplying oil to the roller rows is formed through the bottom of the guide groove 4. In this example, the oil holes 6 are provided at four locations at equal intervals in the circumferential direction. Generally, such an oil hole 6 is formed so as to penetrate in the radial direction of the outer ring 3 and substantially perpendicular to the center axis of the bearing.

The multi-row roller bearing 1 with an oil hole is held so that an oil supply passage provided on a housing holding the outer ring 3 communicates with a guide groove 4. Oil is supplied into the bearing through the oil hole 4 and the oil hole 6. Thus, the oil supply from the oil hole 6 is provided for the lubrication performance of reducing the frictional resistance of the cylindrical roller 2 to the outer ring 3, the inner ring 7, and the retainer 8 while flowing through the gap in the bearing. In addition, the bearing is provided with a cooling performance that suppresses a rise in the temperature of the bearing and prevents a decrease in the performance of the bearing due to the rise in the temperature by being sequentially discharged from the inside of the bearing to a waste oil passage of the housing.

[0004]

However, with the miniaturization and high speed of the device using the roller bearing, the development of a more sophisticated roller bearing has been required, and the lubrication performance and cooling performance by lubrication described above have been improved. Is also an important issue. Therefore, in the above-described multi-row roller bearing 1 with an oil hole, the lubricating oil accumulated in the bearing is adjusted such that the shaft 9 fitted to the inner ring 7 is rotated as shown in FIG.
When the shaft 9 rotates in the direction of arrow (a), the rotation of the cylindrical roller 2, the inner ring 7, and the retainer 8 accompanying the rotation of the shaft 9 naturally causes the inner and outer rings in the same direction as the rotation direction of the shaft 9 as a whole. The oil flow flows through the gap between 7 and 3. More specifically, the oil flow is generated by a circumferential velocity component of the inner and outer races 7 and 3, a velocity component going radially outward by the action of centrifugal force, a collision of the cylindrical rollers 2 with the peripheral surface, and the like. The flow has a velocity component in the direction of the axis 9.

However, the lubricating oil newly flowing into the bearing from the oil hole 6 is a radially inward oil flow having no velocity component of the above-described oil flow in the bearing, and the flow direction is completely different. Due to the difference, when merging with the oil flow in the bearing, the oil flow in the bearing violently collides with the oil flow in the bearing, disturbing the oil flow in the bearing and increasing the agitation resistance of the oil particles in the bearing.
Such a tendency becomes more remarkable as the rotation speed of the shaft 9 becomes higher, or as the amount of oil supplied from the oil hole 6 increases and the injection speed of the oil from the oil hole 6 increases. This is a cause of inconvenience of lowering cooling performance.

The present invention has been made based on the above findings, and it is an object of the present invention to provide a multi-row roller bearing with oil holes, which can improve lubrication performance and cooling performance when lubricating a bearing. I do.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a fuel cell system in which a plurality of roller rows are arranged in a plurality of rows, and an oil hole for supplying oil to the roller rows is formed through an outer ring. In a multi-row roller bearing, an oil flow flowing into the bearing from the oil hole includes a velocity component common to the oil flow in the bearing,
This is achieved by a multi-row roller bearing with oil holes, characterized in that the penetration direction of the oil holes is inclined with respect to the radial direction of the outer ring.

That is, according to the above configuration, for example, the penetration direction of the oil hole with respect to the radial direction is set so that the opening of the inner periphery of the outer ring of the oil hole is positioned forward of the opening of the outer periphery of the outer ring in the rotation direction of the inner ring. If it is inclined in the circumferential direction, the oil flow flowing into the bearing from the oil hole includes a speed component along the circumferential direction of the inner and outer rings as a common speed component with the oil flow in the bearing. And
Compared to a conventional bearing in which an oil hole is formed inward in the radial direction, the oil flow flowing into the bearing from the oil hole has the same speed component as that of the oil flow in the bearing. When the oil flow flowing into the bearing merges with the oil flow in the bearing, collision of the oil flows with each other is reduced. Therefore, it is possible to suppress the turbulence of the oil flow in the bearing due to the oil flow flowing into the bearing from the oil hole and to reduce the stirring resistance between the oil particles in the bearing. Improvement of lubrication performance and cooling performance can be achieved.

The penetration direction of the oil hole is set in the axial direction with respect to the radial direction so that the opening on the inner periphery of the outer ring of the oil hole is located at a position shifted by a predetermined distance in the axial direction of the bearing from the opening on the outer periphery of the outer ring. If inclined, the oil flow flowing into the bearing from the oil hole will
As a speed component common to the oil flow in the bearing, a speed component along the axial direction of the bearing is included, and even in this case,
The effect and effect of suppressing the disturbance of the oil flow in the bearing due to the oil flow flowing into the bearing from the oil hole and reducing the stirring resistance between the oil particles in the bearing can be exhibited.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A multi-row roller bearing with oil holes according to an embodiment of the present invention will be described below in detail with reference to the accompanying drawings. 1 and 2 show a first embodiment of a multi-row roller bearing with oil holes according to the present invention. The multi-row roller bearing 10 with oil holes according to the present embodiment has the cylindrical rollers 2 arranged in two rows, and has a lubrication guide on the outer peripheral surface of the outer ring 13 so as to be located exactly in the middle of each roller row. A groove 14 is provided around,
Oil hole 1 for lubricating the roller rows at the bottom of the guide groove 14
6, 17 are formed through. It is to be noted that the cylindrical rollers 2 of each roller row are positioned at circumferential intervals by a ring-shaped retainer 8 concentric with the outer ring 13 and the inner ring 7 as in the conventional bearing.

In the case of this embodiment, the oil holes 16 and 17 described above are used.
Are formed so as to have the same central axis 18, and in FIG. 2, the same oil hole is present in a pair symmetrically with respect to a line including the center O of the bearing, and Is equipped. Further, in the bearing 10 of the present embodiment, assuming that the rotation direction of the inner ring 7 is the direction of the arrow (b) in FIG. 2, one of the oil holes 16 of the pair is such that the opening on the inner periphery of the outer ring is larger than the opening on the outer periphery of the outer ring. So that it is located forward in the rotation direction of the inner ring 7,
The one obtained by the angle theta ₁ inclined in the circumferential direction to the radial direction of the penetration direction of the oil hole. Oil hole 17 on the other side of the pair
The oil hole 16 extends in the circumferential direction with respect to the radial direction
When the reverse direction to be those obtained by the angle theta ₁ inclined in the opposite direction, arrow direction of rotation of the inner ring 7 of FIG. 2 (b) and,
The opening on the inner periphery of the outer ring is located ahead of the opening on the outer periphery of the outer ring in the rotation direction of the inner ring 7. As will be described later, the oil hole 16 is for supplying oil into the bearing when the inner ring 7 rotates in the direction of the arrow (b) in FIG. ) Is for supplying oil into the bearing when rotating in the opposite direction.

In the above bearing 10, when the inner ring is driven to rotate in the direction of the arrow (b) in FIG.
The lubricating oil supplied to each oil hole 16 through the guide groove 14 from the oil supply passage of the housing that holds and holds the oil 0 flows into the bearing as an oil flow flowing along the central axis 18 of the oil hole 16. On the other hand, the lubricating oil supplied from the oil supply passage of the housing to each oil hole 17 via the guide groove 14 has a velocity component directed outward in the radial direction of the oil flow in the bearing, and a rotational direction indicated by an arrow (b). Since the inflow into the bearing is suppressed due to the speed component, when the rotation direction of the inner ring 7 is an arrow (b),
It hardly functions as a filler port. That is, when the inner ring 7 is rotationally driven in the direction of the arrow (b), the inner ring 7 rotates in the direction opposite to the direction of the arrow (b), with the oil hole 16 serving as a center and functioning as a refueling port. When driven, the oil hole 17 serves as a center and functions as an oil supply port to supply an oil flow along the central axis 18 into the bearing.

When the inner ring 7 is driven to rotate in the direction of the arrow (b), the oil flow along the central axis 18 flowing into the bearing from each oil hole 16 has the same speed as the oil flow in the bearing. Since it includes velocity components along the circumferential direction of the inner and outer rings as components
Compared with a conventional bearing in which an oil hole is formed radially inward of the outer ring, the oil flow flowing from the oil hole 16 into the bearing by an amount equal to the oil flow in the bearing is given. The collision of the oil flows with each other when merging with the oil flow in the bearing is reduced. Therefore, disturbance of the oil flow in the bearing due to the oil flow flowing into the bearing from the oil hole 16 can be suppressed, and the agitation resistance between the oil particles in the bearing can be reduced. The lubrication performance and cooling performance can be improved. In the case of the above embodiment,
Since the oil hole 17 has the inclined direction opposite to the oil hole 16, even when the rotation direction of the inner ring 7 is reversed, the same operation and effect can be obtained.

FIG. 3 shows a second embodiment of a multi-row roller bearing with oil holes according to the present invention. The multi-row roller bearing 20 with oil holes according to the present embodiment is a case in which the rotation direction of the inner ring 7 is limited to only the direction of the arrow (c) and it is not necessary to consider the reverse rotation, and the guide groove on the outer peripheral surface of the outer ring 23 is provided. The oil holes 26 penetrating through 24 are unified into a single type. Each oil hole 26
The center shaft 28 has an angle θ _{2 in the} circumferential direction with respect to the radial direction of the outer ring 23 so that the oil flow flowing into the bearing from the oil hole includes a velocity component in the circumferential direction common to the oil flow in the bearing. It is installed at four places at equal intervals in the circumferential direction. The inner ring 7 and the retainer 8 are common to those of the first embodiment. As described above, when it is not necessary to consider the reverse rotation, no problem occurs even if a single type of oil hole is provided. Since all of the oil holes 26 function effectively as oil filler holes, the amount of lubrication is evenly distributed in the circumferential direction, and the lubrication performance and cooling performance due to lubrication are stable over the entire circumference. Can be expected.

FIGS. 4 to 6 show a third embodiment of a multi-row roller bearing with oil holes according to the present invention. The multi-row roller bearing 30 with oil holes according to the present embodiment has two types of oil holes 3 penetrating the outer ring 33 in the guide grooves 34 on the outer peripheral surface of the outer ring 33.
It is similar to the first embodiment in that 6 and 37 are provided. Note that the inner ring 7 and the retainer 8 are common to the above-described embodiments. However, in the case of the present embodiment, the penetration directions of the oil holes 36 and 37 are set so that the center shafts 38 and 39 are inclined by an angle θ _{3 in} the axial direction of the bearing with respect to the radial direction of the outer ring 33. The same type of oil hole is provided at a position opposing the center of the bearing with respect to the center of the bearing. However, each oil hole 3
6, 37 are arranged with the inclination directions alternately.

When the oil holes 36 and 37 are inclined in the axial direction in this manner, the openings of the oil holes 36 and 37 on the inner periphery of the outer ring are shifted from the openings on the outer periphery of the outer ring by a predetermined distance in the axial direction of the bearing. , And the oil flow flowing into the bearing from these oil holes 36 and 37 includes a speed component along the axial direction of the bearing as a common speed component with the oil flow in the bearing. Also in this case, the turbulence of the oil flow in the bearing due to the oil flow flowing into the bearing from the oil hole can be suppressed, and the effect and effect of reducing the stirring resistance between the oil particles in the bearing can be achieved. Lubrication performance and cooling performance can be achieved. Further, since the inclinations of the oil holes 36 and 37 are opposite to each other, for example, in FIGS. 5 and 6, the oil hole 36 urges oil supply to the left roller row, and the oil hole 37 moves to the right roller row. As a result, both roller rows are evenly lubricated, and it is possible to prevent the lubrication performance and cooling performance due to refueling from being varied by the roller rows.

In the present invention, the number of roller rows is not limited to the above embodiment. Further, the shape of the rollers is not limited to the cylindrical rollers described above, and it goes without saying that the present invention can be applied to a tapered roller bearing using a tapered roller. Also, in the present invention, it goes without saying that the design of the location and number of oil holes can be changed as appropriate without departing from the spirit of the invention.

[0018]

According to the multi-row roller bearing with oil holes of the present invention, the oil flow flowing into the bearing from the oil holes is reduced by inclining the penetration direction of the oil holes with respect to the radial direction. As the speed component along the circumferential direction of the inner and outer rings or the speed component in the axial direction is given as the speed component common to the oil flow of the oil flow, the oil flow flowing into the bearing from the oil hole is The collision between the oil flows at the time of merging is reduced. Therefore, it is possible to suppress the turbulence of the oil flow in the bearing due to the oil flow flowing into the bearing from the oil hole and to reduce the stirring resistance between the oil particles in the bearing. Lubrication performance and cooling performance can be improved, and it is easy to cope with high-speed rotation of the bearing.

[Brief description of the drawings]

FIG. 1 is a side view of a first embodiment of a multi-row roller bearing with oil holes according to the present invention.

FIG. 2 is a sectional view taken along line BB of FIG.

FIG. 3 is a cross-sectional view of a second embodiment of a multi-row roller bearing with oil holes according to the present invention.

FIG. 4 is a cross-sectional view of a third embodiment of a multi-row roller bearing with oil holes according to the present invention.

FIG. 5 is a sectional view taken along line CC of FIG. 4;

FIG. 6 is a sectional view taken along line DD of FIG. 4;

FIG. 7 is a side view of a conventional multi-row roller bearing with oil holes.

FIG. 8 is a sectional view taken along line AA of FIG. 7;

[Explanation of symbols]

 2 Cylindrical roller 7 Inner ring 8 Cage 10, 20, 30 Bearing 13, 23, 33 Outer ring 14, 24, 34 Guide groove 16, 17, 26, 27, 36, 37 Oil hole 18, 28, 38 Central shaft

Claims (1)

[Claims] 1. A multi-row roller bearing with oil holes in which two or more roller rows are arranged in a plurality of rows, and oil holes for supplying oil to the roller rows are formed through the outer ring. A multi-row with oil holes, characterized in that the penetration direction of the oil holes is inclined with respect to the radial direction of the outer ring so that the oil flow flowing into the inside contains a speed component common to the oil flow in the bearing. Roller bearing.