JP6615537B2 - Sealing device - Google Patents

Description

  The present invention relates to a sealing device according to a sealing technique, and more particularly to a sealing device used for an axle bearing portion of a railway vehicle.

  Conventionally, as shown in FIG. 3 as a sealing device used for an axle bearing portion of a railway vehicle, an outer ring 52 attached to an outer ring 62 of a bearing 61, and an inner ring 53 fitted to the inner peripheral side of the outer ring 52 A sealing device 51 is known. The inner ring 53 forms a non-contact type labyrinth seal by forming a minute gap c between the inner part 53 and the rotating side component 63, whereby foreign matter outside the bearing O enters the bearing inside I or grease inside the bearing I. Is prevented from scattering to the outside O of the bearing.

JP 2005-220940 A JP 2011-256965 A

  Since the outer ring 52 and the inner ring 53 are separate members, an assembling operation for fitting the inner ring 53 to the outer ring 52 is required. Therefore, when assembling so as to exhibit an optimum sealing function, it is necessary to insert the inner ring 53 at a predetermined position (an accurate axial position as set).

  In this regard, in the above prior art, since the step portion 52a is provided in the outer ring 52, the inner ring 53 can be inserted into a predetermined position by bringing the inner ring 53 into contact with the step portion 52a during assembly. .

  However, if the step 52a is not provided in the outer ring 52 due to the specifications of the product, the assembly insertion position must be managed by dimensions, and therefore there is a disadvantage that the assembly takes a lot of time and effort.

  In view of the above, an object of the present invention is to provide a sealing device that does not require an assembling operation for fitting an inner ring to an outer ring, and can facilitate manufacture.

In order to achieve the above object, the present invention employs the following means.
That sealing device of the present invention is a sealing device for use in an axle bearing of a railway vehicle, an outer ring portion attached to the outer ring of the bearing, an inner ring portion disposed on the inner peripheral side of the outer ring portion , And the outer ring portion is provided from the outer peripheral cylindrical portion fitted to the inner peripheral surface of the outer ring, and radially inward from one axial end of the outer peripheral cylindrical portion. An end surface portion, a cylindrical portion provided in one axial direction from an inner peripheral end portion of the end surface portion, and provided in one axial direction and one inner diameter direction from one axial end portion of the cylindrical portion. A conical tapered portion and an inner peripheral cylindrical portion provided from one axial end of the tapered portion toward one axial direction, and the inner annular portion is the inner peripheral cylinder. A reversing part continuous to one end in the axial direction of the part, and a cylindrical part provided from the inner peripheral end of the reversing part toward the other in the axial direction, A seal forming portion provided at the other end in the axial direction of the cylindrical portion of the inner ring portion, and the seal forming portion is provided in the other axial direction of the cylindrical portion of the inner ring portion. A bent portion provided radially inward from the end portion and a cylindrical tip portion provided from the inner peripheral end portion of the bent portion toward the other axial direction are integrally provided. (Claim 1).

  The outer ring portion demonstrates the function of attaching the sealing device to the outer ring of the bearing, and the inner ring portion functions to form a non-contact type labyrinth seal by forming a minute gap with the rotating side part. In the present invention, the outer ring portion and the inner ring portion are integrally formed. Therefore, it is not necessary to perform an assembling operation for fitting the inner ring to the outer ring, and it is possible to facilitate the manufacture of the sealing device.

  When integrally forming the inner ring part on the inner peripheral side of the outer ring part, the inner ring part is a reversing part that continues to one end in the axial direction of the outer ring part, It is preferable to have a seal forming part that is continuous with the cylindrical part, and according to this, it is possible to easily form the inner ring part by folding it with respect to the outer ring part. The

  Further, at this time, it is preferable that the cylindrical portion is formed in a tapered surface shape having a gradually decreasing diameter from the reversing portion to the seal forming portion. According to this, the space between the outer ring portion and the inner ring portion is preferable. Since the volume of the portion is set to be relatively small, the amount of grease (grease for bearing lubrication) filled in the space portion can be made small.

  ADVANTAGE OF THE INVENTION According to this invention, the assembly operation which fits an inner ring to an outer ring becomes unnecessary, and can provide a sealing device which can facilitate manufacture.

Sectional drawing of the principal part of the sealing device which concerns on 1st Example of this invention. Sectional drawing of the principal part of the sealing device which concerns on 2nd Example of this invention. Sectional drawing of the sealing device which concerns on a prior art example

  Next, embodiments of the present invention will be described with reference to the drawings.

First embodiment ...
As shown in FIG. 1, a sealing device 11 according to the embodiment is a sealing device used for an axle bearing portion of a railway vehicle, and includes an outer ring portion 21 attached to an outer ring 62 of the bearing, and an outer ring portion 21. An inner ring portion 31 disposed on the inner peripheral side is integrally formed, and both the ring portions 21 and 31 are formed integrally.

  The outer ring portion 21 has an outer peripheral cylindrical portion 22 that is fitted to the inner peripheral surface of the outer ring 62 of the bearing. From the end of one axial direction of the outer peripheral cylindrical portion 22 (the bearing outer side, left in the drawing). The end surface portion 23 is integrally formed toward the radially inner side, the cylindrical portion 24 is integrally formed from the inner peripheral end portion of the end surface portion 23 toward the axial direction, and one end portion of the cylindrical portion 24 in the axial direction is formed. A tapered portion 25 having a conical surface shape is integrally formed from one end in the axial direction toward the inner diameter direction, and an inner peripheral cylindrical portion from one end portion (small-diameter end) of the taper portion 25 toward one axial direction. 26 is integrally formed.

  The inner ring portion 31 includes a reversing portion 32 that is continuous with one end portion in the axial direction of the inner peripheral cylindrical portion 26 in the outer ring portion 21, and the other end in the axial direction (from the bearing inner side). The cylindrical portion 33 is integrally formed toward the right side in the drawing, and a bent portion 35 and a cylindrical tip portion 36 directed radially inward are formed at the other axial end of the cylindrical portion 33. A seal forming portion 34 provided integrally is integrally formed. The seal forming portion 34 forms a non-contact type labyrinth seal by forming a minute gap with a rotation side component (not shown), whereby foreign matter outside the bearing enters the inside of the bearing or inside the bearing. Prevents grease from splashing outside the bearing.

  Both the outer ring portion 21 and the inner ring portion 31 are made of a metal plate, that is, the sealing device 11 is constituted by one metal ring.

  In the sealing device 11 having the above-described configuration, the outer ring portion 21 exhibits a function of attaching the sealing device 11 to the outer ring 62 of the bearing, and the inner ring portion 31 forms a minute gap with the rotation side component. Thus, the function of constituting a non-contact type labyrinth seal is exhibited. In this embodiment, both the ring portions 21 and 31 are integrally formed. Therefore, it is not necessary to perform an assembling operation for fitting the inner ring to the outer ring as in the above-described prior art, and the manufacturing of the sealing device 11 can be facilitated.

  In addition, since both the ring portions 21 and 31 are integrally formed, the inner ring portion 31 is displaced in the axial direction with respect to the outer ring portion 21 even when vibration or the like accompanying travel of the railway vehicle is input during use. There is no end.

Second embodiment ...
In the first embodiment, the cylindrical portion 33 provided in the inner ring portion 31 is formed in a cylindrical surface that is straight in the axial direction. However, as shown in FIG. May be formed in a tapered surface shape having a gradually decreasing diameter from the reversing portion 32 to the seal forming portion 34. In this case, the annular space portion 41 formed between the outer ring portion 21 and the inner ring portion 31 is formed. The volume is set to be relatively small compared to the first embodiment. Therefore, the amount of grease (grease for bearing lubrication) filled in the space portion 41 can be reduced, and the amount of grease used can be reduced.

DESCRIPTION OF SYMBOLS 11 Sealing device 21 Outer ring part 22 Outer peripheral cylinder part 23 End surface part 24,33 Cylindrical part 25 Tapered part 26 Inner peripheral cylinder part 31 Inner ring part 32 Inversion part 34 Seal formation part 35 Bending part 36 Cylindrical tip part 41 Space part 62 Bearing outer ring

Claims (2)

A sealing device used for an axle bearing portion of a railway vehicle, comprising an outer ring portion attached to an outer ring of the bearing, and an inner ring portion disposed on the inner peripheral side of the outer ring portion ,
The outer ring portion includes an outer peripheral cylindrical portion fitted to an inner peripheral surface of the outer ring, an end surface portion provided radially inward from one axial end portion of the outer peripheral cylindrical portion, and the end surface A cylindrical portion provided toward one axial direction from the inner peripheral end of the portion, and a conical surface-shaped taper provided from one axial end of the cylindrical portion toward one axial direction and the inner diameter direction And an inner peripheral cylindrical portion provided from one end in the axial direction of the tapered portion toward one axial direction,
The inner ring portion includes a reversing portion continuous to one end portion in the axial direction of the inner peripheral cylindrical portion, a cylindrical portion provided from the inner peripheral end portion of the reversing portion toward the other axial direction, and the inner portion A seal forming portion provided at the other end in the axial direction of the tubular portion of the ring portion,
The seal forming portion includes a bent portion provided radially inward from the other axial end of the cylindrical portion of the inner ring portion, and from the inner peripheral end of the bent portion to the other axial direction. And a cylindrical tip provided integrally therewith. The sealing device according to claim 1.
The sealing device according to claim 1, wherein the cylindrical portion of the inner ring portion is formed in a tapered surface shape having a gradually decreasing diameter from the reversing portion to the seal forming portion.

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