JPH11201149A - Tapered roller bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the damage to a bearing orbit part due to a foreign matter in lubrication oil, to stabilize bearing characteristics for a long term, and to provide an increased life. SOLUTION: A tapered roller bearing comprises inner and outer rings 1 and 2; a plurality of tapered rollers 4; and a holder 3 having a peripheral surface inclined based on a rotary axis and a space, forming a lubrication oil flow passage, formed between the inner and outer rings 1, 2 and the conical roller 4. A flange part 32 in a radially inward is arranged on the small end side of the holder 3 and the inner peripheral part of the flange part 32 is arranged in the vicinity of the small end part of the inner ring 1 with a microgap therebetween. In this case, when lubrication oil is caused to pass from the small end side of the inner and outer rings 1 and 2 to the large end side, lubrication oil hardly flows in through a gap between the holder 3 and the inner ring 1 and an inflow passage for lubrication oil is narrowed. Thereby, the inflow speed of the lubrication oil and a passage speed at the internal part of the bearing are increased as much as possible, and a foreign matter, such as metallic wear powder, contained in the lubrication oil hardly resides in a gap between the inner and outer rings 1 and 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a tapered roller bearing. The tapered roller bearing is used, for example, inside a transmission of an automobile.

[0002]

2. Description of the Related Art Tapered roller bearings used in transmissions described above are usually lubricated with lubricating oil existing inside the transmission.

For example, tapered roller bearings are often arranged so that lubricating oil passes from the small-diameter end to the large-diameter end between the inner and outer rings. At this time, the space between the inner / outer rings and the tapered rollers serves as a lubricating oil flow path, but due to the presence of the retainer, the space between the outer periphery of the inner ring and the inner periphery of the outer ring around the retainer. The lubricating oil will pass through.

[0004]

In the above-mentioned transmission, since foreign matter such as abrasion powder of the transmission gears is mixed in the lubricating oil, the lubricating oil may pass through the inside of the tapered roller bearing. Often, the foreign substances in the lubricating oil are more likely to bite between the rolling tapered rollers and the inner and outer races, and the bearing raceway portions such as the raceway surfaces of the inner and outer races and the outer peripheral surfaces of the tapered rollers are easily damaged. I have.

[0005] When the bearing raceway is damaged in this manner, the bearing characteristics and the life are inevitably reduced, for example, the rotational torque is increased and peeling is liable to occur.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a tapered roller bearing in which the bearing raceway is prevented from being damaged by foreign matter in lubricating oil, and long-term stability and long life of the bearing characteristics are achieved.

[0007]

According to a first aspect of the present invention, a tapered roller bearing includes an inner / outer ring, a plurality of tapered rollers, a retainer having a circumferential surface inclined with respect to a rotation axis, and The space formed between the inner and outer races and the tapered rollers is used as a lubricating oil flow path, and a radially inward flange is provided on the small diameter end side of the retainer. , Are arranged close to the small-diameter end of the inner ring via a minute gap.

In the tapered roller bearing according to a second aspect of the present invention, the large-diameter end of the cage according to the first aspect is formed in a linear shape along an extension of the peripheral surface.

According to a third aspect of the present invention, a tapered roller bearing is provided with a flange extending radially outward on the large-diameter end side of the retainer according to the first aspect. It is arranged close to the large-diameter end via a minute gap.

In the tapered roller bearing according to a fourth aspect of the present invention, the cage according to the first to third aspects has a pocket for accommodating the tapered roller, and the pocket is provided with notches at both ends in the axial direction. I have.

[0011] The tapered roller bearing of the present invention as described above,
When used in a situation where the lubricating oil passes from the small-diameter end side to the large-diameter end side of the outer ring, the situation is as follows. In other words, by providing a radially inward flange on the small diameter end side of the retainer, it is difficult to allow lubricating oil to flow from between the retainer and the inner ring. The inflow path of the oil becomes narrow, and the inflow speed of the lubricating oil and the passing speed inside the bearing increase. This makes it difficult for foreign substances such as metal abrasion powder contained in the lubricating oil to enter the inside of the bearing. In addition, even if it enters, it is hard to stay between the inner and outer rings, and it is hard for foreign matter to be caught between the inner and outer rings and the tapered rollers.

According to the second aspect of the present invention, since there is no object on the lubricating oil discharge side that obstructs the flow of the lubricating oil, the passage speed of the lubricating oil can be further increased.

Further, in the third aspect, the lubricating oil toward the discharge side is turned radially inward by the radially outward flange provided on the large-diameter end side of the retainer. Lubrication and cooling of the large-diameter end side are improved.

In addition, the lubricating oil flowing from between the small-diameter end of the retainer and the outer ring easily flows to the inner ring through the pockets and the notches of the retainer, so that lubrication and cooling of the inner ring can be achieved. Is good.

[0015]

DETAILED DESCRIPTION OF THE INVENTION FIGS.
Description will be made based on the embodiment shown in FIG.

1 and 2 relate to an embodiment of the present invention. FIG. 1 is a longitudinal sectional view of the upper half of a tapered roller bearing.
FIG. 3 is a plan view in which a part of the cage is developed.

In the illustrated tapered roller bearing, 1 is an inner ring,
2 is an outer ring, 3 is a cage, and 4 is a plurality of tapered rollers. In this embodiment, the configuration of the cage 3 is devised.

That is, the retainer 3 is formed of a conical annular body whose peripheral surface is inclined with respect to the rotation axis, and a plurality of pockets 31 for accommodating the tapered rollers 4 one by one at several places on the circumference. Is provided. On the small-diameter end side of this cage 3,
A radially inward flange 32 is provided.
The inner peripheral edge of the inner ring 2 is disposed close to the small-diameter end side of the inner ring 1 with a small gap therebetween. Further, the flange 32 as described above is not provided on the large-diameter end side of the retainer 3 and is formed in a linear shape along the extension of the peripheral surface. Furthermore, cage 3
A concave notch 33 is provided on each axial side of each pocket 31.
Is provided. The shape of the notch 33 is not limited to a concave shape, but may be any shape such as a semicircle.

The cage 3 having such a configuration is arranged closer to the outer ring 2 than the PCD of the plurality of tapered rollers 4, and the distance between the cage 3 and the outer ring 2 is determined by the distance between the cage 3 and the inner ring 2. 1
Is smaller than the distance between

Next, the flow of lubricating oil in the tapered roller bearing will be described. That is, as an example of the usage state of the tapered roller bearing, a case where lubricating oil passes from the small-diameter end side of the inner and outer rings 1 and 2 to the large-diameter end side will be described.

Here, since the radially inward flange 32 is provided on the small diameter end side of the retainer 3, lubricating oil does not easily flow into the space between the retainer 3 and the inner ring 1, so that most of the Lubricating oil flows from between the cage 3 and the outer ring 2. The lubricating oil that has flowed in from here is
Not only does it pass directly between the pillar portion between the outer ring 2 and the outer ring 2, but also flows from the pocket 31 of the cage 3 and the notch 33 on the small diameter end side of the cage 3 to the inner ring 1 side, as shown in the figure. As shown by the arrow, the fluid flows out from the large-diameter end sides of the inner and outer rings 1 and 2. The flange 32 of the cage 3 and the inner ring 1
Lubricating oil flows in a little from the gap between
It is discharged after being combined with the lubricating oil. With such a flow of the lubricating oil, the contact portions between the inner and outer rings 1 and 2 and the cage 3 and the tapered rollers 4 are lubricated and cooled.

In this embodiment, the distance between the retainer 3 and the outer ring 2 is set to be relatively small, and the large diameter of the retainer 3 Since the end has a linear shape, the inflow speed of the lubricating oil and the passing speed inside the bearing are increased. For this reason, foreign matters such as metal wear powder contained in the lubricating oil are unlikely to stay between the inner and outer rings 1 and 2. Also, since the gap between the flange 32 of the retainer 3 and the inner ring 1 is set small, of the foreign substances contained in the lubricating oil flowing through this gap, large foreign substances cannot flow into the bearing. I have. As described above, the synergistic action of preventing the foreign material from staying and preventing the foreign material from flowing in can prevent the foreign material from being caught between the inner and outer rings 1 and 2 and the tapered roller 4. This results in avoiding damage to the device. Further, since the passage of the lubricating oil can be made smooth, the total amount of the lubricating oil passing increases, and the lubrication and cooling action of the bearing raceway can be activated.

The above-described tapered roller bearing is used, for example, inside an automobile transmission. Although a large amount of foreign substances such as abrasion powder of the transmission gears are mixed in the lubricating oil inside the transmission, as described above, the foreign substances in the lubricating oil hardly enter the tapered roller bearing and stay there. Since it becomes difficult, damage to the bearing raceway portion is suppressed, and improvement in bearing characteristics and life, such as stabilization of rotational torque and improvement in seizure resistance, can be achieved.

It should be noted that the present invention is not limited to only the above-described embodiment, and various applications and modifications are conceivable.

(1) As shown in FIG. 3, the flange 32 of the retainer 3 may be further extended inward in the radial direction than that of the above embodiment to cover the end face of the small diameter end of the inner race 1. In this case, the lubricating oil is supplied to the small diameter end of the cage 3 and the inner ring 1.
And hardly flows from between the outer ring 2 and the small diameter end of the retainer 3 and the outer ring 2, so that the intrusion of foreign matter into the bearing becomes extremely small.
The life is improved. In addition, lubricating oil enters between the retainer and the inner ring through the notch or the gap between the retainer, so that lubrication is improved.

(2) As shown in FIG. 4, a radially outward flange 34 is provided on the large-diameter end side of the retainer 3, and the outer peripheral edge of the flange 34 is the large diameter of the outer race 2. It is arranged close to the inner peripheral surface of the end via a minute gap. In this case, the lubricating oil traveling between the large-diameter end side of the retainer 3 and the outer ring 2 is turned radially inward by the flange 34, and the tapered rollers 4 and the inner ring 1 are rotated.
Will flow to the contact portion with the large-diameter end. For this reason,
The contact portion between the tapered roller 4 and the large-diameter end of the inner ring 1 can be more efficiently lubricated and cooled, and the seizure resistance thereat can be improved.

(3) As shown in FIG. 5, notches 35 may be provided on both sides of the pocket 31 of the retainer 3 in the circumferential direction. In this case, the lubricating oil passing between the retainer 3 and the outer ring 2 easily flows to the inner ring 1 side through the notch 35, and the respective contact portions between the inner and outer rings 1, 2 and the tapered rollers 4 are satisfactorily lubricated. , Will be able to cool.

[0028]

The tapered roller bearing of the present invention has the following effects when used in a situation where lubricating oil passes from the small-diameter end to the large-diameter end of the inner and outer rings.

That is, in the first to fourth aspects, it is difficult to make the lubricating oil flow into the space between the retainer and the inner ring, and the lubricating oil inflow path is narrowed, so that the lubricating oil inflow speed and the inside of the bearing are reduced. Since the passage speed is made as fast as possible, foreign substances such as metal abrasion powder contained in the lubricating oil are less likely to enter the inside of the bearing, and even if they do, it is less likely to stay between the inner and outer rings, Foreign matter can be prevented from entering between the inner and outer rings and the tapered rollers. Further, since the passage of the lubricating oil can be made smooth, the total amount of the lubricating oil passing increases, and the lubrication and cooling action of the bearing raceway can be activated.

According to the second aspect of the present invention, since there is no object on the discharge side of the lubricating oil that obstructs the flow of the lubricating oil, it is possible to further increase the passing speed of the lubricating oil, and it is possible to prevent the foreign matter from staying. Will increase.

Furthermore, in the third aspect, the lubricating oil toward the discharge side is turned radially inward by the radially outward flange provided on the large-diameter end side of the retainer. Lubrication and cooling of the large-diameter end side can be improved.

In addition, in the present invention, the lubricating oil flowing from between the retainer and the outer ring can easily flow toward the inner ring through the pockets and the notches of the retainer, so that the lubrication and cooling of the inner ring can be improved. can do.

As described above, according to the present invention, the bearing characteristics and the life can be improved, for example, the rotation torque is stabilized and the seizure resistance is improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an upper half of a tapered roller bearing according to an embodiment of the present invention.

FIG. 2 is an expanded plan view of a part of the cage of FIG. 1;

FIG. 3 is a longitudinal sectional view of an upper half of a tapered roller bearing according to another embodiment of the present invention.

FIG. 4 is a longitudinal sectional view of an upper half of a tapered roller bearing according to another embodiment of the present invention.

FIG. 5 is a view showing a modified example of the cage and corresponding to FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inner ring 2 Outer ring 3 Cage 31 Cage pocket 32 Flange on the small diameter end side of the cage 33 Notch 4 of the cage 4 Tapered roller

Continuing on the front page (72) Inventor Yasushi Shidahara 3-5-8 Minamisenba, Chuo-ku, Osaka-shi Inside Koyo Seiko Co., Ltd. (72) Inventor Kazuhara Kazuhara 3-58-8 Minamisenba, Chuo-ku, Osaka-shi Koyo Seiko shares In company

Claims (4)

[Claims] An inner / outer ring, a plurality of tapered rollers, a retainer having a circumferential surface inclined with respect to a rotation axis, and a space formed between the inner / outer ring and the tapered rollers is a lubricating oil flow path. A tapered roller bearing, wherein a radially inward flange is provided on the small-diameter end side of the retainer, and the inner peripheral portion of the flange is provided with a small gap at the small-diameter end of the inner ring. A tapered roller bearing, which is arranged in close proximity. 2. The tapered roller bearing according to claim 1, wherein a large-diameter end of the cage is formed in a linear shape along an extension of a peripheral surface. 3. The tapered roller bearing according to claim 1, further comprising: a flange extending radially outward on a large-diameter end side of the retainer, wherein the flange is provided at a large-diameter end of the outer ring. A tapered roller bearing, wherein the tapered roller bearing is disposed close to a side with a small gap therebetween. 4. The tapered roller bearing according to claim 1, wherein the retainer has a pocket for accommodating the tapered roller, and notches are provided at both axial ends of the pocket. Characterized by tapered roller bearings.