JPH09177772A - Sealed bearing device and sealing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent fretting abrasion powder from entering a bearing, and to prevent base oil of grease from leaking, by dividing the contact part of an inner race and an annular fixing member in the sealing range so that they may be positioned in the range different from the range of a rolling body. SOLUTION: A sealing device 8 is provided with a seal case 9 attached to an inner peripheral end 4a of an outer race 4, and a seal part 10 fixed to the seal case 9 at the position facing an oil draining sleeve 7. A dividing wall 12 is so fitted as to be pinched by the inner periphery of the seal case 9 and a reinforcing ring 10a of the seal part 10 and extended in the direction of a large collar part 6a of an inner race 6, a proximity part 12a is extended in parallel to the outer peripheral front surface of the large collar part 6a, and a fine clearance S1 is formed. Accordingly, the sealing range of the sealing device 8 is divided by the dividing wall 12 into sealing ranges M1, M2, the effect of fretting abrasion powder to be generated on the contact part T1 and foreign maters entering from the seal part 10 side through the inner peripheral clearance of a partition washer 11, to be applied to the sealing range M1 is prevented. Grease on the sealing range M1 side does not leak by the fine clearance S1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing mounted on a journal portion of an axle of a railway vehicle and a sealing device for preventing foreign matter from entering the bearing.

[0002]

2. Description of the Related Art FIG. 7 is a sectional view for explaining the structure of an axle portion 100 of a railway vehicle. A wheel (not shown) is attached to the right side of the axle portion 100 in the drawing to rotate the axle 10.
1 and a bearing 102 that holds the shaft 101. The outer ring 103 of the bearing 102 is fixed to an axle housing or the like of a rail car (not shown).

The bearing 102 is a double row tapered roller 104a,
104b is an outwardly arranged so-called hermetically sealed double-row outward tapered roller bearing, which includes an outer ring 103 fixed to the above-mentioned axle housing and inner rings 105a, 105b and inner rings separately divided for each row. The seat 106 is provided. 104c is a cage for the tapered rollers 104a and 104b.

In order to fix the bearing 102 at a predetermined position of the journal portion 101a which receives the excessive load of the shaft 101,
The wheel side W ′ of the journal portion 101a includes a shaft head 101b having a large outer diameter, and a rear lid 107 that abuts on the shaft head 101b.
The wheel-side end of the inner race 105b is in contact with the oil drain sleeve 108.

The free end side F'of the journal portion 101a is attached to the free end side F'end 101c of the shaft 101 with a front lid 110 fixed by a bolt 109.
No. 0 holding portion 110a has a free end side F'oiler sleeve 1
The free end side end portion of the inner ring 105a is in contact with the inner ring 105 through 11.

By tightening the bolt 109 with a predetermined torque, the bearing 102 is sandwiched and fixed between the shaft neck 101b and the front lid 110. Reference numeral 112 is a rotation stop washer that prevents the bolt 109 from loosening.

Reference numeral 113 denotes a bearing 1 which is exposed to water or foreign matter from the outside.
02 is a sealing device for preventing the grease from leaking into the inside of the bearing 102 and preventing the grease enclosed in the bearing 102 from leaking, and is provided on both the wheel side W ′ and the free end side F ′ of the bearing 102 with the same configuration. Has been. Here, the description will be given focusing on the sealing device on the wheel side W ′.

The sealing device 113 includes a seal case 113a fitted and fixed to both ends of the outer ring 103, and an oil seal 113b attached to the end of the seal case 113a and sealingly abutting on the outer peripheral sliding surface of the oil drain sleeve 108. I have it.

FIG. 8 is a diagram showing a detailed structure of the oil seal 113b. The oil seal 113b is configured such that the spring cover 113c and the reinforcing ring 113d fitted to the inner diameter side are fitted and fixed to the inner diameter side of the seal case 113a. Then, water and foreign matter entering from the outside in the direction of the arrow A101 are sealed by the dust lip 113e and the main lip 113f, and the grease enclosed in the bearing 102 is prevented from leaking.
Reference numeral 114 is a spring ring that biases the main lip 113f.

Further, the spring cover 113c is provided with a radial portion extending to the vicinity of the outer peripheral sliding surface of the oil draining sleeve 108, and the inside of the sealing device 113 is divided into a tapered roller side J'and an oil seal side M '. It is roughly divided. By dividing in this manner, intrusion of abrasion powder of the lip generated on the oil seal side M'on the tapered roller side J'is prevented, and on the oil seal side M'generated on the tapered roller side J '. Intrusion of metal abrasion powder is prevented.

Further, as shown in FIG. 9, the rear lid 121 is for the purpose of more completely preventing intrusion of water and foreign matter from the outside.
Is integrated with the oil drain sleeve, and the seal case 122
The mounting end side of the oil seal 113b is protruded to the wheel side W'and fitted in the fitting groove 121a with a gap maintained. In addition, 124 is the seal case 122 and the rear lid 121.
By providing a cover that covers the gap between the labyrinth part 1
23 is provided to complicate the path to the seal portion and prevent water, foreign matter, and the like from entering from the outside.

[0012]

However, in the structure of the axle portion 100 employed in such a railroad vehicle, as the railroad vehicle travels, it is subjected to radial loads, vibrations, and impacts, and in the thrust direction. Also, the combined load of these causes a slight bending of the shaft 101 and a slight relative movement with respect to the bearing 102.

This slight bending is mainly due to the wheel side portion W'supported by the bearing 102 of the shaft 101 (arrow A).
102), and each component member fitted into the shaft 101 is slightly oscillated.

Then, the end surface on the wheel side W'of the inner ring 105b of the bearing 102 and the contact end surface 108a on the free end side F'of the oil removing sleeve 108, the contact end surface 108b of the bearing 102 and the inner ring 105b, and the free end side of the rear lid 107. Fretting wear occurs on the end face F'and the contact end face 108c of the oil removing sleeve 108 on the wheel side W '.

This fretting wear is a kind of wear phenomenon caused by minute movements between metal surfaces, and is characterized by generating rust-like wear powder. It was accepted to some extent as a fate.

However, when this abrasion progresses, the generated abrasion powder mixes with the grease and causes discoloration of the grease, or when it enters the rolling surface as a foreign substance, it acts as a lapping agent to form a gap. May increase the sound and vibration, reduce the life of the bearing, and deteriorate the performance of the bearing.

Further, the assembling accuracy of the shaft 101, the bearing 102, the oil draining sleeve 108 and the rear lid 107 is deteriorated by fretting wear, which causes leakage of base oil in the grease which is essential for lubrication of the bearing, resulting in poor lubrication. Let

On the other hand, if the fretting wear powder enters the oil seal 113b, it causes increased wear of the lip portion, which is a factor for intrusion of external rainwater and foreign matter. However, the oil seal 113b has an oil drain sleeve 1
Since the spring cover 113c having the radial portion extending to the vicinity of the outer peripheral sliding surface of No. 08 is provided, the ingress of the fretting wear powder was relatively limited.

Therefore, in order to prevent the problem caused by such fretting wear powder, the maintenance of the bearing has been regularly performed conventionally to prevent the problem from occurring.

However, in recent years, it has been required that the overhaul and inspection period for maintaining the bearing be extended, for example, from the conventional 3 to 4 years to 5 to 8 years or more.

On the other hand, the structure of the bearing portion itself has become smaller and smaller in cross section along with the weight reduction of vehicles, and the inner space itself of the bearing has also become smaller. Therefore, the amount of grease filled in the bearing also tends to decrease because it is filled in the same volume ratio to the internal space as in the conventional case. Further, as the vehicle speed increases, the volume ratio to the internal space decreases from 50% at the beginning of the development of the sealed bearing to 30%, and a bearing having a small rolling resistance due to a small amount of high-quality grease is desired.

Therefore, in such a situation, the problem of fretting wear powder entering the inside of the bearing and the escape of the base oil of the grease, even if it is a problem that has not been a problem in the prior art, is the bearing. It has become a serious problem because its influence on the functions such as lubrication and life is increased.

The present invention has been made in order to solve the above-mentioned problems of the prior art, and its object is to prevent fretting wear powder generated in the bearing portion from entering the inside of the bearing and to provide a base oil for grease. It is an object of the present invention to provide a bearing device and a sealing device that can prevent maintenance of the bearing for a long period of time by extending the maintenance and inspection period by extending the maintenance period.

[0024]

In order to achieve the above object, according to the present invention, an outer ring attached to a housing for holding and fixing a bearing, an inner ring fixed to a journal portion of a rotating shaft, and A bearing having a rolling element arranged between the outer ring and the inner ring, and sandwiching the inner ring of the bearing from both ends,
An annular fixing member that fixes the movement in the thrust direction with respect to the journal portion of the shaft, seal case portions that are attached to both ends of the outer ring of the bearing, and a seal portion that is in sliding contact with the outer peripheral surface of the annular fixing member. A hermetically sealed bearing device having a hermetically sealing device for hermetically sealing the inside of the bearing, wherein an abutting portion at which an inner ring of the bearing and an annular fixing member abut in the hermetically sealed region sealed by the hermetically sealing device is different from the rolling element. It comprises a dividing means for dividing so as to be located in the area.

However, the dividing means includes a dividing wall extending from the seal case portion of the sealing device, and a minute gap which is a part of the dividing wall and which is closer to the inner portion than the end surface of the inner ring of the bearing. It is also preferable to provide a proximity portion to be formed, and further to provide this proximity portion with a seal lip that comes into contact with a portion inside the end surface of the inner ring of the bearing.

Further, the dividing means has a dividing wall for dividing the hermetically sealed region, and an elastic member integrally formed with the dividing wall and fitted in the vicinity of the abutting portion. It is also preferable to include a seal lip that is in sliding contact with the surface of the dividing wall.

Therefore, in the hermetically-sealed bearing device having the above-mentioned structure, a foreign substance or the like generated at the abutting portion by forming a hermetically sealed region by the dividing means inside the abutting portion at which the inner ring of the bearing and the annular fixing member abut. Is prevented, and the base oil of the grease sealed in the bearing is prevented from leaking out.

The minute gap forms a labyrinth due to the proximity portion that forms a minute gap closer to the inner side than the end surface of the inner ring of the bearing, and functions to suppress the movement of foreign matter or base oil of grease.

Further, the seal lip provided in the proximity portion improves the sealing performance of the sealing area newly formed by the dividing means.

Further, a sealed area is formed by the partition wall supported by the elastic member fitted in the vicinity of the abutting portion and the seal lip slidingly contacting the surface of the partition wall.

On the other hand, in the sealing device, the outer ring of the bearing is sealed with the outer ring surface of the annular fixing member for fixing the inner ring of the bearing to both ends to fix the movement of the shaft in the thrust direction. A sealing device provided with seal case parts attached to both ends of the annular fixing member, and a seal part slidingly contacting the outer peripheral surface of the annular fixing member, extending from the seal case part and inside the end surface of the inner ring of the bearing. It is characterized in that the partition wall is provided with a proximity portion that forms a minute gap in proximity to the portion.

Further, it is also preferable that the proximity portion is provided with a seal lip which comes into contact with a portion inside the end surface of the inner ring of the bearing.

[0033]

BEST MODE FOR CARRYING OUT THE INVENTION

(Embodiment 1) FIG. 1 shows a first embodiment of a sealed bearing device to which the present invention is applied. This sealed bearing device 1
Is mainly described as being used for an axle portion of a railway vehicle as described in the section of the prior art, but the application is not limited to this, and a sealed bearing having a similar structure is used. It is applicable to devices.

FIG. 1 shows the structure of only the portion necessary for explaining the embodiment of the present invention from the axle portion described with reference to FIG. In the figure, the other configurations are treated as the same as those in the related art described in detail, and the description thereof will be omitted.

Reference numeral 2 denotes a shaft, which is mounted on wheels (not shown) for rotation, and a bearing 3 is mounted on a journal portion 2a which receives the excessive load of the shaft 2. The bearing 3 includes an outer ring 4, rolling elements 5, and an inner ring 6 fixed to the journal portion 2 a of the shaft 2.

Reference numeral 7 is an oil draining sleeve as an annular fixing member for fixing the inner ring 6 with respect to the shaft 2 in the thrust direction.

Reference numeral 8 denotes a sealing device, which is an inner peripheral end portion 4 of the outer ring 4.
a seal case 9 attached to a and an oil draining sleeve 7
And a seal portion 10 which is held and fixed to the seal case 9 at a position opposed to. The shape of the seal portion is the same as that of the conventional one, and includes a reinforcing ring 10a and a dust lip 10b and a main lip which are made of a rubber-like elastic material integrally formed with the reinforcing ring 10a and are provided in an appropriate shape. 10
c is in sliding contact with the outer peripheral surface of the oil draining sleeve 7.
Further, 11 is a partition washer, which partitions the seal portion from the inside of the bearing 3.

Further, in the first embodiment, a dividing wall 12 as a dividing means is fitted so as to be sandwiched between the inner circumference of the seal case 9 and the reinforcing ring 10a of the seal portion 10. The partition wall 12 extends from the seal case 9 in the direction of the large flange portion 6a of the inner ring 6, and the proximal portion 12 at the tip end portion
a extends parallel to the outer peripheral surface of the large collar portion 6a, and the minute gap S
1 (labyrinth gap) is formed.

Therefore, the dividing wall 12 divides the region sealed by the sealing device 8 into the sealing region M1 on the inner side of the bearing and the sealing region M2 on the outer side. In this case, the end portion of the inner ring 6 where the fretting wear powder is generated and the contact portion T1 of the oil removing sleeve 7 are not in the same sealing area as the rolling element 5 but in the outer sealing area M2.

Therefore, at the contact portion T1, the fretting wear powder generated and the partition washer 11 from the seal portion 10 side
Foreign matter entering through the inner circumferential clearance of the
Since it is accumulated and stays in the sealing area M1 and the influence on the sealed area M1 is prevented, deterioration of the performance of the bearing due to wear or the like is prevented. On the other hand, the grease enclosed in the sealed area M1 does not leak to the outside (in this case, the sealed area M2 side) due to the minute gap S1, and the reduction of the base oil is reduced to improve the grease performance. Can be held for a period of time.

FIG. 2 is an application of the conventional technique described in FIG. 9 to the first embodiment. The sealing device 28 is intended to more completely prevent the intrusion of water or foreign matter from the outside. The oil draining sleeve 27 is integrated with the rear lid, and the fitting groove 27a is formed in the portion corresponding to the rear lid. Has been done. The end of the seal case 29 is bent so as to fit into the fitting groove 27a, and a cover 29a is provided on the outer periphery of the seal case 29 to cover a gap between the seal case 29 and a portion corresponding to the rear lid. The labyrinth gap S2 is formed to complicate the path to the seal portion 10 to prevent water or foreign matter from entering from the outside.

Further, FIG. 3 shows a dividing wall 12 'adopted to increase the volume of the sealing region M2 when the fretting wear powder is generated in a large amount when the sealing region M1 can be sufficiently secured.

(Second Embodiment) FIG. 4 is a diagram for explaining a second embodiment to which the present invention is applied. In the second embodiment, a sealing lip 12b that slidably abuts the large flange portion 6a of the inner ring 6 is provided in the proximity portion 12a of the partition wall 12 of the sealing device in FIG. 1 of the first embodiment, and the sealing region is provided. Improves the tightness of M1 and M2.

The seal lip 12b performs the same function as the dust lip by inclining to the sealing area M2 side, and prevents foreign matter such as fretting wear powder generated from the contact portion T1 from entering the sealing area M1. I'm doing it.

Other structures and operations are the same as those of the first embodiment described above, and therefore, the same components are designated by the same reference numerals and their description is omitted.

(Third Embodiment) FIG. 5 is a diagram for explaining a third embodiment to which the present invention is applied. In the third embodiment, the partition wall 31 is fitted and fixed to the large flange portion 6a of the inner ring 6 by the elastic member 31a integrally formed. Therefore, the bearing side sealing region sealed by the sealing device 32 is sealed by the dividing wall 31.
Is divided into Further, the side lip 33a provided on the seal portion 33 makes sliding contact with the surface of the partition wall 31,
Grease leakage from the sealed region M1 side is prevented.

The elastic member 31a is fixed in the vicinity of the contact portion T where the fretting wear powder is generated. Even if the elastic member 31a is attached, the generated fretting wear powder does not scatter in the sealed area and the contact portion T To prevent grease base oil from leaking from.

In the seal portion 33 of this embodiment, the main lip 33b is on the wheel side, and the auxiliary lip 33c is the bearing 3.
It is arranged on the side, but this is a sealed area M2 and M
3 is filled with a predetermined amount of grease so that the seal portion can be kept lubricated for a long period of time. Further, instead of the side lip 33a, a seal lip that abuts the inner peripheral surface of the seal case 29 may be provided at the tip of the radial portion of the partition wall 31.

However, in the method of fixing and attaching the dividing wall 31, the fitting support by the elastic member 31a is basically used, but a groove is provided on the abutment portion T1 side of the oil cutting sleeve in consideration of prevention of coming off. It is also necessary to appropriately adopt a configuration such as fitting. However, the dividing wall 31
The elastic member 3 if the attachment of the
It is also possible to make 1a unnecessary.

FIG. 6 shows the dividing wall 3 in the third embodiment.
FIG. 6 presents a method for ensuring the fixed attachment method of No. 1 of FIG. The oil removing sleeve 42 is provided with a groove 42a on the side of the contact portion T1 to serve as a fitting portion. In addition, the dividing wall 41
Is integrally provided with a fitting end portion 41a that is bent inward so as to fit with the groove 42a and an elastic member 41b that comes into contact with the wheel-side end surface of the inner ring 6.

Therefore, the partition wall 41 does not move in the thrust direction even if vibration is applied when the vehicle is running after assembling the bearing portion.

Further, in the case of this embodiment, the sealed region M2 is formed to have a very small volume, but the contact portion T1 is closed by the elastic member 41b and the fitting end portion 41a as described above. It may be one, but it is not always necessary. Further, since the radial portion 41c of the partition wall 41 extends to the vicinity of the seal portion 43, the sealed area M1 can be made large.

[0053]

EFFECTS OF THE INVENTION The present invention has the above-described structure and action, and since a new sealing area is formed in the sealing area by the dividing means, foreign matter or the like generated at the contact portion between the inner ring and the annular fixing member is prevented. In addition to preventing invasion, leakage of the base oil of the grease sealed in the bearing is prevented, and the performance of the bearing is maintained for a long period of time, which makes it possible to extend the maintenance and inspection period.

In the structure provided with the proximity portion which forms a minute gap close to the inner ring, this minute gap becomes a labyrinth,
High sealing performance is achieved by suppressing the movement of foreign matter and the base oil of grease.

Further, the seal lip provided in the proximity portion completely seals the sealing area newly formed by the dividing means.

The elastic member fitted in the vicinity of the abutting portion can prevent foreign matter from scattering from the abutting portion and can enlarge the sealing area on the rolling element side.

[Brief description of the drawings]

FIG. 1 is a cross-sectional explanatory view of a main part of a sealed bearing device to which the present invention is applied (Embodiment 1).

FIG. 2 is an explanatory cross-sectional view of a main part of a sealed bearing device to which the present invention is applied (Embodiment 1).

FIG. 3 is an explanatory cross-sectional view of a main part of a sealed bearing device to which the present invention is applied (Embodiment 1).

FIG. 4 is an explanatory cross-sectional view of a main part of a sealed bearing device to which the present invention is applied (Embodiment 2).

FIG. 5 is an explanatory cross-sectional view of a main part of a sealed bearing device to which the present invention is applied (Embodiment 3).

FIG. 6 is an explanatory cross-sectional view of a main part of a sealed bearing device to which the present invention is applied (Embodiment 3).

FIG. 7 is a cross-sectional explanatory view of a conventional sealed bearing device.

FIG. 8 is an explanatory cross-sectional view of a main part of a conventional sealed bearing device.

FIG. 9 is a cross-sectional explanatory view of essential parts of a conventional sealed bearing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sealed bearing device 2 Shaft 2a Journal part 3 Bearing 4 Outer ring 5 Rolling element 6 Inner ring 6a Large collar part 7,27,42 Oil removing sleeve (annular fixing member) 27a Fitting groove 8,28 Sealing device 9,29 Seal case 10 , 33, 43 Seal part 10a Reinforcement ring 10b Dustrip 10c Main lip 11 Partition washer 12, 12 ', 31, 41 Dividing wall 12a Proximity part 12b Seal lip 31a, 41b Elastic member 33a Side lip 41a Fitting end part 41c Radial direction Department

Claims (6)

[Claims] 1. A bearing having an outer ring attached to a housing for holding and fixing the bearing, an inner ring fixed to the journal of a rotating shaft, and a rolling element arranged between the outer ring and the inner ring. An annular fixing member that sandwiches the inner ring of the bearing from both ends and fixes movement in the thrust direction with respect to the journal portion of the shaft, seal case portions that are attached to both ends of the outer ring of the bearing, and an outer peripheral surface of the annular fixing member. And a sealing device that seals the inside of the bearing with a sealing portion that is in sliding contact with the inner ring of the bearing and the annular fixing member abut in a sealing region that is sealed by the sealing device. A hermetically sealed bearing device, comprising a dividing means for dividing the abutting portion so as to be located in a region different from that of the rolling element. 2. The dividing means includes a dividing wall extending from a seal case portion of the sealing device, and a minute gap that is a part of the dividing wall and is closer to an inner portion than an end surface of the inner ring of the bearing. The sealed bearing device according to claim 1, further comprising a proximity portion to be formed. 3. The sealed bearing device according to claim 1, wherein a seal lip that abuts an inner side portion of an end surface of the inner ring of the bearing is provided in the vicinity of the dividing means. 4. The dividing means includes a dividing wall that divides the sealing region, and an elastic member that is integrally formed with the dividing wall and that is fitted in the vicinity of the contact portion, and the sealing device includes: The sealed bearing device according to claim 1, further comprising a seal lip that is in sliding contact with the surface of the partition wall. 5. An outer peripheral surface of an annular fixing member that abuts on both ends of an inner ring of the bearing to fix the movement of the shaft in the thrust direction,
A sealing device for sealing between an outer ring of a bearing and a seal case part attached to both ends of the outer ring, and a seal part slidably contacting an outer peripheral surface of the annular fixing member. A sealing device comprising: a partition wall extending from the portion and having a proximity portion that forms a minute gap in the vicinity of an inner side portion of the inner ring of the bearing. 6. The sealing device according to claim 5, wherein the proximity portion is provided with a seal lip that comes into contact with a portion inside the end surface of the inner ring of the bearing.