JP2005220940A - Sealing device for bearing for axle shaft - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealing device for a bearing for an axle shaft capable of maintaining a good sealing condition by suppressing heat generation by a non-contact sealing structure. <P>SOLUTION: A first partition member 3 is fitted and fixed in an inner diameter side of a seal case 22 of which one end is fixed on an outer ring 32a of the bearing 32 via a first annular member 2. A second partition member 5 is fitted and fixed on the axle shaft 31 via a slinger 33 and a second annular member 4. Lubricant 6 filled in a minute gap S1 between opposed surfaces of the first and the second partition member 3, 5 is retained in an rough surface 8a formed on the opposed surface of the second partition member 5. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a seal device used for an axle bearing of a high-speed vehicle such as a railway vehicle, and more specifically, prevents moisture and dust from entering and a lubricant leakage from the inside of the bearing while suppressing heat generation. The present invention relates to a sealing device.

  A conventional axle bearing seal device 21 will be described with reference to FIGS. In FIG. 7, 31 is an axle, and 32 is a bearing fitted to the axle 31. The bearing 32 is freely rotatable between a non-rotating outer ring 32a fixed to a bearing box (not shown), a pair of inner rings 32b and 32b fitted on the axle 31, and the outer ring 32a and the inner rings 32b and 32b. , And retainers 32d, 32d for holding the tapered rollers 32c, 32c,... Are arranged as main components, and seal devices 21, 21 are arranged at both ends thereof. It is set up. The seal device 21 includes a seal case 22 having one end fitted and fixed to the inner diameter side of the outer ring 32a, and a slinger 33 that is integrally attached to the inner diameter portion of the other end of the seal case 22 and fitted to the axle 31 on both ends of the bearing 32. , 33 slidably contact the elastic seal 23 (see, for example, Patent Document 1).

  As shown in FIG. 8 which is an enlarged view of the region A in FIG. 7, the elastic seal 23 is located on the bearing side and is in sliding contact with the slinger 33, and on the bearing side of the slinger 33 on the non-bearing side. It has an outer lip 23b that forms a labyrinth in cooperation with an annular groove 33a formed on the end face, and a felt intermediate lip 23c that is located between the inner lip 23a and the outer lip 23b and that is in sliding contact with the slinger 33.

  The seal device 21 prevents the lubricant inside the bearing from flowing out by the inner lip 23a, and prevents foreign matter from entering the bearing by the outer lip 23b. When the axle 31 rotates, the air in the inner space S of the elastic seal 23 expands due to the friction between the elastic seal 23 and the slinger 33, and exhausts through the intermediate lip 23c formed of a felt material having air permeability. Is done. Thereafter, when the sealing device or the like is cooled, the outside air enters the inner diameter side space S through the intermediate lip 23c, and therefore no negative pressure is generated in the inner diameter side space S. Further, since the felt material constituting the intermediate lip 23c is a member having a large number of fine holes, the lubricant is held in the fine holes, so that the lubricant shortage at the sliding contact portion of the intermediate lip 23c hardly occurs.

  However, since the sealing device 21 seals the inner lip 23a of the elastic seal 23 by elastically sliding the slinger 33 against the slinger 33, if the tightening margin of the inner lip 23a is increased in order to enhance the sealing action. The frictional force between the elastic seal 23 and the slinger 33 is increased. Then, the inner lip 23a generates heat due to friction with the slinger 33 and wears and hardens, so that a good sealing state cannot be maintained.

Utility Model Registration No. 2526587

  The present invention was devised in view of such circumstances, and an object of the present invention is to provide an axle bearing capable of maintaining a good sealing state over a long period of time by suppressing frictional heat associated with the rotation of the axle by a non-contact seal structure. It is in providing a sealing device.

  A seal device for an axle bearing according to the present invention includes: an end of a seal case fixed to an outer ring of a bearing fitted to the axle; and a seal for an axle bearing that seals the bearing interposed between the seal case and the axle. In the device, a first partition member formed in a disk shape is fixed to the inner diameter side of the seal case so as to extend to the axle side, and is formed in a disk shape on the outer diameter side of the axle. The second partition member is fixed to the first partition member so as to face the axial bearing side of the axle with a small gap, and an uneven surface is formed on the facing surface of the first and / or second partition member. In addition, the lubricant is held between the opposing surfaces of the first and second partition members to form a non-contact seal.

  In the above-described seal device for an axle bearing, the first and second partition members are opposed to each other in a non-contact state, and the inside and outside of the bearing are blocked by a lubricant held between them. Thus, since the first and second partition members are in a non-contact state, even if the axle rotates, heat generation is small and does not wear out.

  In addition, since the lubricant filled between the opposing surfaces of the first and second partition members is held by the uneven surface formed on the opposing surfaces of the first and / or second partition members, the lubricant There is no shortage.

  On the other hand, since the second partition member is provided with a small gap on the axial bearing side of the axle of the first partition member, the entrance from the outside to the inside of the bearing is formed on the radially inner side of the axle of the minute gap. At the same time, the exit from the inside of the bearing to the outside is formed on the outside in the radial direction of the axle of the minute gap. Therefore, in order for foreign matter such as moisture and dust outside the bearing to enter the bearing, it is necessary to enter from the inside in the radial direction of the axle to the minute gap between the opposing surfaces of the first and second partition members. is there. However, it is difficult for foreign matter that has entered the seal case to collect at the inner bottom of the seal case and reach the entrance of the minute gap formed above the seal case. Even if the foreign matter reaches the entrance of the minute gap, the entry of the foreign matter can be prevented by the lubricant filled in the minute gap.

  On the other hand, even if the lubricant inside the bearing accumulates at the inner bottom of the seal case and reaches the exit of the minute gap formed on the outer side in the radial direction of the axle, the lubricant held in the minute gap moves outside the bearing. Is prevented from leaking.

  As described above, the present sealing device prevents the first and second partition members from being worn and holds the lubricant filled between them, so that the inside and the outside of the bearing are shut off. Therefore, it is possible to maintain a good seal state for a long period of time, which prevents entry of foreign matter and leakage of lubricant inside the bearing.

  In addition, the uneven surface of the first and / or second partition member is formed directly on the first and / or second partition member, and on the opposing surface of the first and / or second partition member. A holding member made of a rubber material on which the uneven surface is formed may be baked and fixed in the formed recess. When the holding member having the uneven surface is baked and fixed in the concave portion of the first and / or second partition member, the uneven surface can be easily formed.

  Further, when a first annular member is interposed between the first partition member and the seal case, and a disc portion extending to the vicinity of the axle side is provided at an end of the first annular member on the side opposite to the bearing. The disc portion of the first annular member is disposed on the side opposite to the bearing of the first partition member, and the disc portion of the first annular member is fitted to the axle or the axle (for example, a slinger or a later-described member). A small gap is formed between the outer peripheral surface of the two annular members). The foreign matter that has entered the seal case cannot reach the minute gap between the opposing surfaces of the first and second partition members unless it exceeds the disc portion of the first annular member. Further, even if the lubricant held in the minute gap between the first and second partition members is pushed out from the minute gap, the lubricant is between the first partition member and the disk portion of the first annular member. It is difficult to accumulate at the inner bottom of the internal space of the sealing device formed at the top and to exceed the first partition member. Therefore, intrusion of foreign matter and leakage of the lubricant are suppressed. On the other hand, even if foreign matter enters the seal case vigorously, it does not directly collide with the first partition member by hitting the disk portion of the first annular member, and therefore between the opposing surfaces of the first and second partition members. Is maintained.

  Further, when a reduced diameter portion is provided at the bearing-side end of the first annular member, a step is formed by the reduced diameter portion of the first annular member protruding inward in the radial direction of the axle from the inner peripheral surface of the seal case. Is done. Even if the lubricant inside the bearing tries to enter the seal device along the inner peripheral surface of the seal case, the lubricant enters the seal device due to a step between the inner peripheral surface of the seal case and the reduced diameter portion of the first annular member. Intrusion is prevented.

  Further, when a second annular member is interposed between the second partition member and the axle, and a flange portion extending to the vicinity of the seal case side is provided at the bearing side end of the second annular member, The flange portion of the second annular member is disposed on the bearing side of the second partition member, and is fitted to the outer peripheral portion of the flange portion of the second annular member and the inner diameter side of the seal case or the seal case (for example, the first member described above) A small gap is formed between the inner peripheral surface of the first annular member and the like. This minute gap limits the amount of lubricant inside the bearing that enters the seal device from the inside of the bearing, and with respect to the lubricant filled in the minute gap between the opposing surfaces of the first and second partition members. Excessive force to push out of the bearing does not work. Therefore, the retention of the lubricant by the uneven surface of the first and / or second partition member is maintained for a long time.

  Further, when a diameter-enlarged portion is provided at the end of the second annular member on the side opposite to the bearing, a step is formed by the diameter-enlarged portion of the second annular member that protrudes radially outward of the axle from the outer peripheral surface on the axle side. Is done. Even if the foreign matter that has entered the seal case travels along the outer peripheral surface on the axle side and enters the seal device, the foreign matter enters the seal device due to a step between the outer peripheral surface on the axle side and the enlarged diameter portion of the second annular member. Intrusion is prevented.

  The first positioning member made of a rubber material is baked and fixed on the inner diameter side of the first annular member and on the bearing side and / or the non-bearing side of the first partition member, and the second When the second positioning member made of a rubber material is baked and fixed on the outer diameter side of the annular member and on the bearing side and / or the non-bearing side of the second partition member, the first and second partition members face each other. The distance between the surfaces, the distance between the first partition member and the disk portion of the first annular member, and the distance between the second partition member and the second annular member are maintained.

  In the axle bearing seal device of the present invention, the first and second partition members are opposed to each other in a non-contact state, and the inside and outside of the bearing are blocked by a lubricant filled between them. Even if the axle rotates, frictional heat is not generated, and wear of the first and second partition members can be prevented. Moreover, since the uneven surface is formed in the opposing surface of the 1st and / or 2nd partition member, the lubricant filled between the opposing surfaces of the 1st and 2nd partition member is hold | maintained over a long period of time. it can. Even if foreign matter outside the bearing enters the seal case, it is difficult to reach the lubricant filled between the opposing surfaces of the first and second partition members, so that the lubricant can be prevented from being contaminated. As described above, the seal device for an axle bearing according to the present invention prevents the frictional heat of the first and second partition members and fills the opposing surfaces of the first and second partition members with each other. By maintaining this and preventing the lubricant from being soiled, a good sealing state can be maintained for a long time.

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. In addition, the same code | symbol is attached | subjected to the site | part same as a prior art example, and detailed description is abbreviate | omitted.

FIG. 1 is an enlarged cross-sectional view showing a state in which the sealing device 1 of the present invention is applied to an axle bearing 32 using double-row tapered rollers 32c, 32c,. The seal device 1 is disposed between a seal case 22 fitted on the inner diameter side of the outer ring 32 a and a slinger 33 fitted on the axle 31, and is fitted and fixed on the inner diameter side of the seal case 22. A first partition member 3 fitted and fixed on the inner diameter side of the first annular member 2, a second annular member 4 fitted and fixed on the outer diameter side of the axle 31 via a slinger 33, a second made from the second partition member 5 which has been fitted fixed on the outer diameter side of the annular member 4, first and second partition members 3,5 lubricant small gap S ₁ between facing surfaces mutual 6 (FIG. 2 In this case, the bearing 32 is blocked from the outside.

  As shown in FIG. 2 which is an enlarged view of the main part of FIG. 1, the first annular member 2 has a disk portion 2b at the end of the cylindrical portion 2a fitted and fixed to the inner diameter side of the seal case 22 on the opposite side to the axle. 31 is a member that is formed toward the inside in the radial direction of 31 and has a reduced diameter portion 2c formed at the end of the cylindrical portion 2a on the bearing side.

  The first partition member 3 extends in a disk shape toward the inner side in the radial direction of the axle 31 at the end of the cylindrical portion 3 a that is fitted and fixed to the inner diameter side of the first annular member 2. It is a member in which the partition plate 3b is formed. The first partition member 3 is fitted on the inner diameter side of the cylindrical portion 2a of the first annular member 2, and then the diameter of the end portion on the bearing side of the cylindrical portion 2a of the first annular member 2 is reduced. While forming the reduced diameter part 2c, it is an inner peripheral surface of the cylindrical part 2a of the 1st annular member 2, Comprising: The disk part 2b and the reduced diameter part 2c, and the cylindrical part 3a of the 1st partition member 3 The first positioning member 7a, 7b made of a rubber material is baked and fixed therebetween, thereby being integrated with the first annular member 2.

  The second annular member 4 is formed with a flange portion 4b on the bearing side end of the cylindrical portion 4a that is fitted and fixed to the outer diameter side of the slinger 33 toward the radially outer side of the axle 31, and the cylindrical portion. This is a member in which an enlarged diameter portion 4c is formed at the end of the opposite bearing side of 4a.

The second partition member 5 extends in a disk shape toward the outer side in the radial direction of the axle 31 at the end of the cylindrical portion 5a fitted and fixed on the outer diameter side of the second annular member 4. This is a member in which a partition plate 5b is formed, and a holding member 8 made of a rubber material is integrally baked and fixed in a recess 5c formed on the surface opposite to the bearing of the partition plate 5b. The second partition member 5 is fitted on the outer diameter side of the cylindrical portion 4 a of the second annular member 4, and then the end of the cylindrical portion 4 a of the second annular member 4 on the side opposite to the bearing is enlarged. Processed to form the enlarged diameter portion 4c and the outer peripheral surface of the cylindrical portion 4a of the second annular member 4 and the flange portion 4b and the enlarged diameter portion 4c and the cylindrical portion 5a of the second partition member 5 The second positioning member 9a, 9b made of a rubber material is baked and fixed in between, so that the second annular member 4 is integrally formed. The holding member 8 is a member for increasing the holding force of the lubricant 6 filled in the minute gap S ₁ between the first and second partition members 3 and 5, and has an uneven surface 8a formed on the surface thereof. It is. As shown in FIGS. 2 and 3, the uneven surface 8a of the holding member 8 is formed by arranging a large number of convex portions 8b, 8b,.

On the other hand, the disc portion 2b of the first annular member 2 extends from the cylindrical portion 2a to the vicinity of the outer peripheral surface of the cylindrical portion 4a of the second annular member 4, and the inner peripheral portion of the disc portion 2b. And a minute gap S ₂ is formed between the outer peripheral surface of the cylindrical portion 4 a of the second annular member 4. The partition plate 3b of the first partition member 3 extends from the cylindrical portion 3a to the vicinity of the outer peripheral surface of the cylindrical portion 5a of the second partition member 5, and the inner peripheral portion of the partition plate 3b and the second peripheral portion. A minute gap S ₃ is formed between the outer peripheral surface of the cylindrical portion 5 a of the partition member 5. The flange portion 4b of the second annular member 4 extends from the tubular portion 4a to the vicinity of the inner peripheral surface of the tubular portion 2a of the first annular member 2, and the outer peripheral portion of the flange portion 4b and the first annular portion 4a. A minute gap S ₄ is formed between the inner peripheral surface of the tubular portion 2 a of the annular member 2. The partition plate 5b of the second partition member 5 extends from the tubular portion 5a to the vicinity of the inner peripheral surface of the tubular portion 3a of the first partition member 3, and the outer peripheral portion of the partition plate 5b and the first partition portion 5b. A minute gap S ₅ is formed between the inner peripheral surface of the cylindrical portion 3 a of the partition member 3.

Further, the first annular member 2 and the first partition member 3 are maintained at a predetermined interval in the axial direction of the axle 31 by the first positioning member 7a, and the disc portion of the first annular member 2 is maintained. An internal space S ₆ of the sealing device 1 is formed between 2 b and the partition plate 3 b of the first partition member 3. The second annular member 4 and the second partition member 5 are maintained at a predetermined interval in the axial direction of the axle 31 by the second positioning member 9b, and the second annular member 4 and the second partition member 5 are An internal space S ₇ of the sealing device 1 is formed between the partition plates 5 b of the two partition members 5.

The lubricant 6 is applied in advance to the facing surfaces of the partition plates 3b and 5b of the first and second partition members 3 and 5, and after the assembly of the seal device 1, the first and second partition members 3 are further applied. , 5 is filled in the minute gap S ₁ between the opposing surfaces.

The sealing device 1 of the present invention is configured as described above, and the first annular member 2 and the first partition member 3 fixed to the non-rotating side seal case 22 and the second ring member 33 fixed to the rotating side slinger 33. The annular member 4 and the second partition member 5 are opposed to each other in a non-contact manner to form a so-called labyrinth seal structure. The labyrinth seal structure has minute gaps S _{1 to} S ₅ and internal spaces S ₆ and S ₇ , and the lubricant filled in the minute gap S ₁ between the first and second partition members 3 and 5. 6 shuts off the inside and outside of the bearing 32. Thus, since the 1st annular member 2 and the 1st partition member 3, and the 2nd annular member 4 and the 2nd partition member 5 are made to oppose in non-contact, the 2nd accompanying the axle 31 is accompanied. Even if the annular member 4 and the second partition member 5 are rotated, frictional heat is not generated in the first and second annular members 2 and 4 and the first and second partition members 3 and 5. By preventing the first and second annular members 2 and 4 and the first and second partition members 3 and 5 from being worn, a good sealing state can be maintained.

Further, the lubricant 6 filled in the minute gap S ₁ between the first and second partition members 3, 5 has the uneven surface 8 a on the opposing surface of the first partition member 3, so hardly leaks from the gap S _1, a lubricant can be held for a long time in the first and second partition members 3,5.

Further, since the disc portion 2b of the first annular member 2 is extended to the vicinity of the outer peripheral surface of the cylindrical portion 4a of the second annular member 4, the inlet from the outside of the bearing 32 to the inside of the sealing device 1 is provided. A minute gap S ₂ is formed on the inner side in the radial direction of the axle 31. When foreign substances water or dusts from entering the seal case 22, collects in the inner bottom portion of the seal case 22, it is difficult to reach the small gap S _2. Further, even if moisture tries to enter the minute gap S ₂ along the surface of the slinger 33, it is blocked by the enlarged diameter portion 4 c of the second annular member 4. Even if the foreign matter reaches the minute gap S _2, it is difficult to reach the minute gap S ₃ that accumulates in the inner bottom portion of the inner space S ₆ of the sealing device 1 and serves as the inlet of the minute gap S ₁ . Since the foreign matter has a structure difficult to reach the small gap S _1, fine gap S ₁ lubricant 6 is hardly dirt is filled in, it can be maintained over a good sealing state for long-term.

On the other hand, since the flange portion 4b of the second annular member 4 of the first annular member 2 extends to the vicinity of the inner peripheral surface of the cylindrical portion 2a of the first annular member 2, the seal is sealed from the inside of the bearing 32. A minute gap S _{4 serving as} an entrance to the inside of the device 1 is formed on the outer side in the radial direction of the axle 31. The lubricant (not shown) inside the bearing 32 travels along the inner peripheral surface of the seal case 22 and approaches the minute gap S ₄ , but enters the minute gap S ₄ by the reduced diameter portion 2 c of the first annular member 2. Is blocked. Even over the first reduced-diameter portion 2c of the annular member 2, can only penetrate small portions into the interior of the sealing device 1 by fine gap S _4. From the interior of the lubricant small gap S ₄ of the bearing 32 penetrates the sealing apparatus 1, even reaching the small gap S ₅ comprising an inlet from the bearing side to the small gap S _1, a small gap S ₁ A force sufficient to extrude the filled lubricant 6 cannot be obtained. Thus, also prevented that since no lubricant 6 is filled in the small gap S ₁ is being extruded from the small gap S ₁ can maintain good sealing state and lubricant inside the bearing 32 from leaking to the outside it can.

Since the first and second partition members 3, 5 are fixed by the first and second positioning members 7a, 7b, 9a, 9b, the opposing surfaces of the first and second partition members 3, 5 are opposed to each other. A minute gap S ₁ is maintained at a predetermined interval. Further, since the disk portion 2b of the first annular member 2 is disposed on the opposite side of the first partition member 3, the first partition member even if foreign matter enters the seal case 22 vigorously. 3 and the minute gap S ₁ is maintained at a predetermined interval. Thus, by keeping the minute gap S ₁ at a predetermined interval, the lubricant 6 filled in the interior can be stably held, and a good sealing state can be maintained.

  As mentioned above, although the embodiment of the seal device for an axle bearing of the present invention has been described, the present invention is not limited to the above embodiment, and various modifications are possible. For example, as shown in FIG. While the holding member 8 is baked and fixed to the recess 3c formed on the bearing side surface of the partition plate 3b of the first partition member 3, nothing is present on the surface opposite to the bearing side of the partition plate 5b of the second partition member 5. It does not have to be provided.

Further, as shown in FIG. 4B, a plurality of (for example, two) first partition members 3 and 3 are fitted and fixed to the first annular member 2, and a plurality of (for example, two) (for example, two) The two second partition members 5 and 5 are fitted and fixed, and a plurality of minute gaps S ₁ and S formed between the opposed surfaces of the plurality of sets of the first and second partition members 3 and 5. ₁ can be filled with the lubricant 6 to block the inside and outside of the bearing 32. When the double seal structure is used as described above, the sealing action is improved as compared with the case of the single seal structure of FIG. 2. Therefore, the disc portion 2 b of the first annular member 2 and the first partition member 3 The partition plate 3 may be brought into close contact, and the flange portion 4b of the second annular member 4 and the partition plate 5 of the second partition member 5 may be brought into close contact with each other. In this case, the first partition member 3 can be fixed simply by providing the first positioning member 7b on the bearing side of the cylindrical portion 3a, and the second positioning member 9a is provided on the non-bearing side of the cylindrical portion 5a. Only the second partition member 5 can be fixed. Furthermore, the holding members 8 and 8 may be provided on both the first and second partition members 3 and 5 as shown in FIG.

  Further, the concave and convex surface 8a of the holding member 8 is formed by forming spherical convex portions 8b, 8b,... At the radial center of the holding member 8 as shown in FIGS. Not only, but as shown in FIG. 5 (A), the convex portions 8c, 8c,... Alternatively, convex portions 8c, 8c,... May be formed on the entire surface of the holding member 8 as shown in FIG. Further, as shown in FIG. 5C, a plurality of ridges 8d, 8d,...

  Further, the concave and convex surface 8a of the holding member 8 is not limited to the convex portions 8b, 8b,..., But is constituted by concave portions 8e, 8e,... Provided on the surface of the holding member 8 as shown in FIG. Alternatively, convex portions 8b, 8b,... May be provided inside a hole 8f formed on the surface of the holding member 8 as shown in FIG.

  Moreover, in the said embodiment, although the uneven | corrugated surface 8a is formed in the 2nd partition member 5 by baking and fixing the holding member 8 to the partition plate 5b of the 2nd partition member 5, 1st and / or An uneven surface may be formed directly on the partition plates 3b, 5b of the second partition members 3, 5.

It is a longitudinal cross-sectional view which illustrates the sealing device of this invention. It is a principal part enlarged view of FIG. It is a partial front view of an uneven surface. (A) And (B) is a principal part expanded longitudinal sectional view which shows the modification of this invention. (A) thru | or (C) are the partial front views which show the modification of an uneven surface. (A) And (B) is a longitudinal cross-sectional view which shows the modification of an uneven surface. It is a longitudinal cross-sectional view which illustrates the conventional sealing device. It is a principal part enlarged view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sealing device 2 1st annular member 3 1st partition member 4 2nd annular member 5 2nd partition member 6 Lubricant 7a, 7b 1st positioning member 8 Holding member 8a Irregular surface 9a, 9b 2nd Positioning member 22 Seal case 31 Axle 32a Outer ring 32 Bearing

Claims (7)

In a seal device for an axle bearing that fixes one end of a seal case to an outer ring of a bearing fitted to an axle and is interposed between the seal case and the axle to seal the bearing.
A first partition member formed in a disk shape is fixed to the inner diameter side of the seal case so as to extend to the axle side, and a second disk formed in a disk shape on the outer diameter side of the axle. The partition member is fixed to the first partition member so as to face the axial bearing side of the axle with a small gap therebetween, and an uneven surface is formed on the facing surface of the first and / or second partition member, A seal device for an axle bearing in which a lubricant is held between opposing surfaces of the first and second partition members.   2. The axle bearing seal device according to claim 1, wherein a holding member made of a rubber material having the irregular surface is baked and fixed in a concave portion formed on the opposing surface of the first and / or second partition member.   A first annular member is interposed between the first partition member and the seal case, and a disc portion extending to the vicinity of the axle side is provided at an end of the first annular member on the opposite bearing side. An axle bearing seal device according to 1 or 2.   The seal device for an axle bearing according to claim 3, wherein a reduced diameter portion is provided at an end portion of the first annular member on the bearing side.   The 1st annular member is interposed between the 2nd partition member and an axle, and the flange part extended to the seal case side vicinity was provided in the edge part by the side of a bearing of the 2nd annular member. 4. The seal device for an axle bearing according to any one of 4 above.   The seal device for an axle bearing according to claim 5, wherein an enlarged diameter portion is provided at an end of the second annular member on the side opposite to the bearing.   The first positioning member made of a rubber material is baked and fixed on the inner diameter side of the seal case and on the bearing side and / or the non-bearing side of the first partition member, and on the outer diameter side of the axle. The seal device for an axle bearing according to any one of claims 1 to 6, wherein a second positioning member made of a rubber material is baked and fixed on the bearing side and / or the non-bearing side of the second partition member.