JP2003194069A - Double-row conical roller bearing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a double-row conical roller bearing device capable of making the optimum lubrication by avoiding shortage of a lubricant while a return flow of the lubricant is maintained. <P>SOLUTION: The double-row conical roller bearing device has an outer ring 2 in a single piece construction, which is furnished with oil vents 20 penetrating to the peripheral surface 18 from the inside surface 17 located outside in axial direction more than the rolling surface 2B on which that row 7 of conical rollers located outside in the axial direction roll. Accordingly the lubricating oil supplied from an oil supplying hole 13 in the outer ring 2 is fed partially via the outer row 7 of rollers, oil vents 20, and a passage 31 formed in a housing 1, to return to the internal space of the housing 1. That is, the oil vents 20 form a circulating path for the lubricating oil passing via that row 7 of rollers located on the outside in the axial direction. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double row tapered roller bearing device for rotatably supporting a pinion shaft constituting a differential gear of an automobile in a housing.

[0002]

2. Description of the Related Art Conventionally, as a double row tapered roller bearing device of this type, there is one shown in FIG. This double-row tapered roller bearing device comprises a double-row tapered roller bearing 100 that cantilevers a pinion shaft 110 having a pinion 122 meshing with a ring gear with respect to a housing 111. The double row tapered roller bearing 100 includes a tapered roller row 101 on the inner side in the axial direction and a tapered roller row 102 on the outer side in the axial direction. The tapered roller row 101 is disposed between the first inner ring 103 and the first raceway surface of the integral outer ring 105, and the tapered roller row 102 is formed of the second inner race 107 and the second raceway surface of the integral outer ring 105. It is located in between. This integrated outer ring 10
The outer peripheral surface of 5 is fitted and fixed to the inner peripheral surface of the opening of the housing 111, and the inner peripheral surfaces of the first and second inner rings 103 and 107 are fitted and fixed to the outer peripheral surface of the pinion shaft 110. .

The integral outer ring 105 has through holes 112 and 113 penetrating from the inner peripheral surface between the first raceway surface and the second raceway surface to the outer peripheral surface. The through hole 112 communicates the bearing inner space between the tapered roller row 101 and the tapered roller row 102 with the upper space in the housing 111 via the passage 123. The through hole 113 communicates the bearing inner space with the lower space of the housing 111 via the passage 115 of the housing 111.

A hub 116 is fitted and fixed to the pinion shaft 110 adjacent to the end surface of the second inner ring 107. A seal portion 121 is fitted between the hub 116 and the integrated outer ring 105.

In this double-row tapered roller bearing device, the pinion 122 is rotated by the rotation of the pinion shaft 110, which supports the double-row tapered roller bearing 100 with respect to the housing 111.
Ring gear that rotates and meshes with this pinion 122
(Not shown) rotates.

[0006] This rotating ring gear is the housing 1
Lubricating oil accumulated at a predetermined level in the lower space of 11 is scooped up and supplied from the upper space to the bearing internal space through the passage 123 of the housing 111 and the through hole 112 of the outer ring 105. The lubricating oil supplied to this bearing internal space is supplied to the tapered roller row 101 on the pinion side and the tapered roller row 102 on the opening side, and the double row tapered roller bearing 10
Lubricate 0. The lubricating oil supplied to the double row tapered roller bearing 100 passes through the tapered roller row 101 and is returned to the lower space. Further, the lubricating oil is used for the integrated outer ring 10
5 through the through hole 113 and the passage 115 of the housing 111 to be returned to the lower space.

[0007]

By the way, the second inner ring 1
The large-diameter end outer peripheral surface 107A of No. 07, the end inner peripheral surface 105A of the integral outer ring 105, and the seal portion 121 form a dead end space N. As a result, the flow of the lubricant from the upper through hole 112 to the tapered roller row 102 on the outer side in the axial direction is obstructed,
The lubricant retained in the dead end space N may deteriorate, resulting in poor lubrication.

For example, when the amount of lubricating oil sprayed from the ring gear is reduced, the amount of lubricating oil supplied from the upper through hole 112 is reduced, and in particular, insufficient lubrication is provided in the outer tapered roller row 102. There was a possibility. That is, regarding the inner tapered roller row 101, the inner ring 103 and the outer ring 105 sandwiching the inner tapered roller row 101 are sandwiched.
Since the space between and is open toward the space inside the housing 111, even when the supply of lubricating oil to the through holes 112 becomes insufficient, the lubricating oil can be supplied as compared with the outer tapered roller row 102. It is easily supplied and it is hard to run out of lubricating oil. On the other hand, in the outer tapered roller row 102, the space between the inner ring 107 and the outer ring 105 that sandwich the tapered roller row 102 is closed by the seal portion 121, so that the lubricating oil tends to run short. Particularly, when the ring gear and the pinion 122 compose a differential gear of an automobile, the lateral G when the automobile is in the posture or cornering
Due to (acceleration) and the like, splashing of the lubricating oil by the ring gear may be eliminated, and the tapered roller row 102 on the opening side may sometimes be seized.

SUMMARY OF THE INVENTION An object of the present invention is to provide a double row tapered roller bearing device capable of avoiding the shortage of the lubricant while maintaining the reflux of the lubricant and enabling optimum lubrication.

[0010]

In order to achieve the above object, a double row tapered roller bearing device according to the invention of claim 1 is a double row tapered roller bearing device in which a rotating shaft is cantilevered by an opening of a housing. An integral outer ring having double-row raceways, an oil supply hole penetrating between the outer circumferential surface of the integral outer race and the double-row raceways, and an outer peripheral surface of the integral outer ring and the double-row raceways. An oil vent hole penetrating therethrough; and an oil vent formed in the integral outer ring and penetrating from an inner peripheral surface on the axial outer side to an outer peripheral surface of the rolling surface on which the tapered outer roller row rolls. Is characterized by.

According to the double-row tapered roller bearing device of the present invention, from the inner peripheral surface axially outside of the rolling surface on which the axially outer tapered roller row rolls, the integral outer ring is provided. An oil vent penetrating the outer peripheral surface was formed.

Therefore, according to the double-row tapered roller bearing device of the first aspect of the present invention, a part of the lubricating oil supplied from the oil supply hole of the integral outer ring passes through the axially outer tapered roller row. Then, it is returned to the space inside the housing through the oil vent. As described above, the oil vent can form a circulation path of the lubricating oil passing through the tapered roller row on the outer side in the axial direction, so that the flow of the lubricant to the tapered roller row on the outer side in the axial direction can be promoted, and the lubrication failure can be prevented. It is possible to eliminate worry and prevent seizure of the tapered roller row on the outer side in the axial direction.

A double row tapered roller bearing device according to a second aspect of the present invention is the double row tapered roller bearing device according to the first aspect, wherein the oil vent extends from a vertical lower end of an inner peripheral surface of the integral outer ring. Direction, and a seal member disposed between the integral outer ring and the inner ring axially outside the oil vent, and an inner peripheral surface of the integral outer ring, An oil sump is formed below the position of the oil vent on the inner peripheral surface of.

According to the double-row tapered roller bearing device of the second aspect of the invention, the axial direction is larger than that of the oil vent formed at the position deviated by a predetermined angle in the circumferential direction from the vertical lower end of the inner peripheral surface of the integral outer ring. The seal member disposed on the outer side between the integral outer ring and the inner ring and the inner peripheral surface of the integral outer ring form an oil reservoir below the position of the oil vent on the inner peripheral surface of the integral outer ring.

In the present invention, the lubricating oil is supplied from the upper space in the housing to the oil supply hole formed in the integral outer ring, and the lubricating oil is a double-row conical cylinder arranged between the integral outer ring and the inner ring. Supplied to the roller train.

The lubricating oil supplied to the axially outer tapered roller rows of the double row tapered roller rows lubricates the raceways of the integral outer ring and the inner ring on which the tapered roller rows roll,
The oil pool is reached through the row of tapered rollers. When the lubricating oil accumulated in the oil reservoir reaches the oil vent, the lubricating oil is discharged from the oil vent to the outer peripheral surface of the integral outer ring and returned to the lower space of the housing.

According to the present invention, even when the supply of lubricating oil to the oil supply hole becomes insufficient, the lubricating oil stored in the oil reservoir can be used to lubricate the tapered roller row on the outer side in the axial direction. . Therefore, according to the double-row tapered roller bearing device of the present invention, the lubricant can be maintained in the recirculation state by the oil vent, and the lack of the lubricant can be avoided by the oil reservoir to achieve the optimum lubrication.

Of the double-row tapered roller rows, the lubricating oil supplied to the tapered roller rows axially inward of the axially outer tapered roller rows is the integral outer ring on which the tapered roller rows roll. Then, the raceway surface of the inner ring is lubricated, and it is returned to the lower space of the housing from between the integral outer ring and the inner ring through the row of tapered rollers.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to the embodiments shown in the drawings.

FIG. 1A shows a cross section of an embodiment of a double row tapered roller bearing device of the present invention. In this embodiment, an integral outer ring 2 is press-fitted into an inner peripheral surface 1A-1 of an opening 1A of a housing 1, an inner inner ring 3 is disposed opposite to an inner raceway surface 2A of the integral outer ring 2, and The outer race 2 is provided with an outer inner race 5 arranged to face the outer raceway surface 2B of the outer race 2. Further, in this embodiment, the inner tapered roller row 6 arranged between the inner raceway surface 2A of the integral outer ring 2 and the inner inner race 3, the outer raceway surface 2B of the integral outer ring 2 and the outer inner race. 5 and an outer tapered roller row 7 arranged between the outer roller 5 and the outer roller 5.
The inner tapered roller row 6 is fitted in the annular cage 10, and the outer tapered roller row 7 is fitted in the annular cage 11.

The integral outer ring 2 has an inner raceway surface 2A.
There is a through hole 12 penetrating from the inner peripheral surface to the outer peripheral surface between the outer raceway surface 2B and the outer raceway surface 2B. The through hole 12 is, as shown in FIG. Only 6 are formed. For example, of the six through holes 12, the through hole 12 located above the rotation center line J is the oil supply hole 13
Therefore, the through hole 12 located below the rotation center line J becomes the oil discharge hole 15.

The integral outer ring 2 has a mounting flange 16 at the axially inner end of the outer peripheral surface thereof. The mounting flange 16 is in close contact with the end surface 1A-2 of the opening 1A of the housing 1. And fixed with bolts (not shown).

The integral outer ring 2 has an outer raceway surface 2B.
It has an oil vent 20 penetrating from the inner peripheral surface 17 on the outer side to the outer peripheral surface 18. This oil vent 20
As shown in FIG. 1 (A), are formed at two locations that are displaced in the circumferential direction by a predetermined angle from the lowest point of the integrated outer ring 2. A seal member 23 is arranged between the inner peripheral surface 22 of the integral outer ring 2 on the outer side of the oil vent 20 and the outer inner ring 5. The seal member 23 is fixed to the inner peripheral surface 22 of the integral outer ring 2.

The inner peripheral surface 17 of the integrated outer ring 2 and the seal member 23 disposed between the integrated outer ring 2 and the inner ring 5 axially outside the oil vents 20, 20 are the inner peripheral surface 17 of the integrated outer ring 2. An oil sump 33 is formed below the position of the oil vent 20 at 17. Further, the opening 20A on the inner peripheral side of the oil vent 20 is formed on the outer side of the tapered roller row 7
Is located above the center point of the large diameter side end surface of the tapered roller at the lowest point.

In the double row tapered roller bearing device of this embodiment, as shown in FIG. 2, a pinion shaft 26 having a pinion 25 at one end is press-fitted and fixed to the inner peripheral surfaces of the inner rings 3 and 5, and the pinion 25 is provided. Meshes with the ring gear 27 and constitutes, for example, a differential gear of an automobile.

According to the double-row tapered roller bearing device having the above-mentioned structure, the integral outer ring 2 has an inner circumference axially outer than the rolling surface 2B on which the tapered roller row 7 axially outer of the housing 1 rolls. An oil vent 20 penetrating from the surface 17 to the outer peripheral surface 18 was formed. Therefore, according to this double-row tapered roller bearing device, a part of the lubricating oil supplied from the oil supply hole 13 of the integral outer ring 2 passes through the axially outer tapered roller row 7 and then the oil vent 20. Through the passage 31 of the housing 1 and returned to the space inside the housing 1. In this way, the oil vent 20 can form a circulation path of the lubricating oil passing through the outer tapered roller row 7, so that the flow of the lubricant to the outer tapered roller row 7 can be promoted and there is no fear of poor lubrication. It can be eliminated, and seizure of the outer tapered roller row 7 can be prevented.

Further, according to the double row tapered roller bearing device of this embodiment, the lubricating oil supplied to the outer tapered roller row 7 is the raceway surface of the integral outer ring 2 and inner ring 5 on which the tapered roller row 7 rolls. And passes through the tapered roller row 7 to reach the oil sump 33. When the lubricating oil accumulated in the oil sump 33 reaches the oil vent 20, the lubricating oil is discharged from the oil vent 20 to the outer periphery of the integral outer ring 2 and the housing 1
It is returned to the lower space via the passage 31.

Therefore, according to this embodiment, even when the supply of the lubricating oil to the oil supply hole 13 becomes insufficient, the outer tapered roller row 7 can be lubricated by the lubricating oil stored in the oil sump 33. Therefore, according to this double-row tapered roller bearing device, while the oil vent 20 maintains the recirculation of the lubricant, the oil sump 33 avoids the shortage of the lubricant and the optimum lubrication becomes possible.

Since the opening 20A on the inner peripheral side of the oil vent 20 is located above the center point of the large diameter side end surface of the tapered roller at the lowest point of the tapered roller row 7 on the outer side, The lubricating oil accumulated in the oil sump 33 can reliably lubricate the tapered roller row 7.

The lubricating oil supplied to the tapered roller row 6 on the inner side in the axial direction lubricates the raceways of the integral outer ring 2 and the inner ring 3 on which the tapered roller row 6 rolls, and passes through the tapered roller row 6. Then, it is returned into the housing 1 from between the outer ring 2 and the inner ring 3. Further, the lubricating oil overflowing from the space between the tapered roller rows 6 and 7 arranged between the integral outer ring 2 and the inner rings 3 and 5 consists of the through holes 12 located below the rotation center line J. The oil is discharged from the oil discharge hole 15.

[0031]

As is clear from the above, in the double row tapered roller bearing device of the first aspect of the present invention, the integral outer ring has an axial outer side than the rolling surface on which the axially outer tapered roller row rolls. An oil vent was formed to penetrate from the inner peripheral surface to the outer peripheral surface.
Therefore, according to the double row tapered roller bearing device of the first aspect of the invention, the lubricating oil supplied from the oil supply hole of the integral outer ring partially passes through the tapered roller row on the outer side in the axial direction,
It is returned to the space inside the housing through the oil vent. In this way, since the oil vent can form a circulation path for the lubricating oil that passes through the outer tapered roller row,
It is possible to promote the flow of the lubricant to the outer tapered roller rows, eliminate the risk of poor lubrication, and prevent seizure of the tapered roller rows on the opening side.

Further, in the double-row tapered roller bearing device according to the invention of claim 2, the outer side in the axial direction of the oil vent is formed at a position deviated by a predetermined angle in the circumferential direction from the vertical lower end of the inner peripheral surface of the integral outer ring. The seal member disposed between the integral outer ring and the inner ring and the inner peripheral surface of the integral outer ring form an oil sump below the position of the oil vent on the inner peripheral surface of the integral outer ring. According to the present invention, the lubricating oil is supplied from the upper space in the housing to the oil supply hole formed in the integral outer ring, and the lubricating oil is supplied to the double row tapered roller rows arranged between the integral outer ring and the inner ring. To be done.

The lubricating oil supplied to the axially outer tapered roller row lubricates the raceways of the integral outer ring and inner ring on which the tapered roller row rolls, and reaches the oil sump through the tapered roller row. When the lubricating oil accumulated in the oil reservoir reaches the oil vent, the lubricating oil is discharged from the oil vent to the outer peripheral surface of the integral outer ring and returned to the lower space of the housing.

According to the present invention, even when the supply of the lubricating oil to the oil supply hole becomes insufficient, the lubricating oil accumulated in the oil sump can lubricate the tapered roller row on the outer side in the axial direction. Therefore, according to the double-row tapered roller bearing device of the present invention, while the circulation of the lubricant is maintained by the oil vent, the lack of the lubricant is avoided by the oil reservoir, and the optimum lubrication can be performed.

[Brief description of drawings]

FIG. 1 (A) is a plan view of an embodiment of a double row tapered roller bearing device of the present invention, and FIG. 1 (B) is a sectional view of the embodiment.

FIG. 2 is a cross-sectional view showing a main part of the differential gear having the above embodiment.

FIG. 3 is a sectional view of a conventional double-row tapered roller bearing device.

[Explanation of symbols]

1 ... Housing, 1A ... Opening, 1A-1 ... Inner peripheral surface, 1
A-2 ... end face, 2 ... integral outer ring, 2A ... inner raceway surface, 2
B ... outer raceway surface, 3 ... inner inner ring, 5 ... outer inner ring,
6, 7 ... Tapered roller row, 12 ... Through hole, 13 ... Oil supply hole, 15 ... Oil discharge hole, 16 ... Mounting flange, 17 ... Inner peripheral surface, 20 ... Oil vent, 20A ... Opening, 23 ... Sealing member, 25 ... Pinion, 26 ... Pinion shaft, 33 ... Oil sump.

Claims (2)

[Claims] 1. A double-row tapered roller bearing device in which a rotating shaft is cantilevered by an opening of a housing, has an integral outer ring having double-row raceway surfaces, and the double-row raceway is provided from an outer peripheral surface of the integral outer ring. An oil supply hole that penetrates between the surfaces, an oil discharge hole that penetrates between the outer peripheral surface of the integral outer ring and the raceway surfaces of the double row, and an axially outer tapered roller row formed in the integral outer ring. A double row tapered roller bearing device comprising: an oil vent that penetrates from an inner peripheral surface axially outside of a rolling surface to an outer peripheral surface thereof. 2. The double row tapered roller bearing device according to claim 1, wherein the oil vent is formed at a position deviated from the vertical lower end of the inner peripheral surface of the integral outer ring by a predetermined angle in the circumferential direction, The seal member disposed between the integral outer ring and the inner ring axially outside the oil vent and the inner peripheral surface of the integral outer ring are located below the position of the oil vent on the inner peripheral surface of the integral outer ring. A double row tapered roller bearing device characterized by forming an oil sump.