JP2009185938A - Roller bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a roller bearing capable of operating without causing trouble owing to imperfect lubrication even under a poorly lubricated condition such as at a low temperature in winter, at starting after a long-time stop, etc. <P>SOLUTION: A plurality of recesses 28a are formed at the escape groove 28 of the inner ring 20. Because the lubricating oil can be held certainly in the escape groove 28 by seizing the oil with these recesses 28a, it is possible to enhance the lubricity by feeding the oil into the bearing. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a roller bearing such as a cylindrical roller bearing or a tapered roller bearing, and more particularly to a roller bearing used in a drive device for a railway vehicle.

  For example, in a railway vehicle drive device, a bearing is often lubricated by splashing up lubricating oil by rotation of a gear. However, after low temperatures in winter and after stopping for a long time, oil is not easily supplied to the sliding portion of the bearing, for example, the sliding portion between the collar surface of the inner ring and the rolling element, which may cause poor lubrication.

  As a countermeasure, for example, in the tapered roller bearing shown in Patent Document 1, a flat thin groove is provided at the boundary between the raceway surface and the flange surface of the inner ring, and the lubricating oil is held in the thin groove, The lubricity of the bearing is improved by supplying the lubricating oil held in the above to the sliding portion.

JP 2006-300196 A

  However, even if the thin groove is provided in a flat shape as described above, the lubricating oil may not be retained in the thin groove, and the risk of poor lubrication cannot be wiped out.

  An object of the present invention is to provide a roller bearing that can be driven without causing poor lubrication even under rare lubrication conditions such as at low temperatures in winter and at the start after a long stop.

  In order to solve the above-mentioned problems, the present invention provides an outer ring having a raceway surface on the inner peripheral surface, an inner ring having a raceway surface on the outer peripheral surface and formed with flange surfaces on both axial sides of the raceway surface, and a raceway of the outer ring. A roller bearing having a plurality of rolling elements arranged in a freely rolling manner between a raceway surface of the inner ring and a raceway surface of the inner ring, and having a fillet groove at the boundary between the raceway surface and the flange surface of the inner ring. In addition, a plurality of recesses are formed.

  In this way, by providing a plurality of recesses in the relief groove, the lubricant can be captured by the recesses, so that the lubricant can be reliably held in the relief groove. During bearing operation under rare lubrication conditions, the lubricating oil retained in this fillet groove is supplied to the sliding part between the race and the rolling element (for example, the contact part between the collar surface and the end face of the rolling element), which causes poor lubrication. Can be prevented. Moreover, since the amount of oil that can be held in the sag groove can be increased by providing the recess in the slush groove, a larger amount of oil is supplied to the sliding portion and the lubricity can be improved.

  Moreover, the said subject can be solved also by making a thin groove | channel into a tapered shape toward the opening side. That is, since the lubricating oil can be captured at the constricted portion of the thin groove, the lubricating oil is less likely to flow from the thin groove, and the lubricating oil can be more securely held in the thin groove. Similar effects can be obtained. In addition, the tapered shape allows the internal volume of the slash groove to be increased while maintaining the size of the opening of the slush groove, thereby increasing the amount of oil that can be retained and further improving the lubricity. be able to.

  In tapered roller bearings using tapered rollers as rolling elements, a large load is applied between the large-diameter end surface of the tapered roller and the large collar surface of the inner ring facing the tapered roller. Become. Therefore, in the case of a tapered roller bearing, the plurality of recesses are formed in at least a recess groove provided on the large diameter side of the raceway surface of the inner ring, or the recess groove is formed in a tapered shape so that the tapered roller and the inner ring have a tapered shape. It is desirable to improve the lubricity of the contact portion with the large brim surface.

  If such a roller bearing is used for a railway vehicle drive device, the drive device can be operated without causing poor lubrication even at low temperatures in winter or at the start after a long stop.

  As described above, according to the present invention, it is possible to obtain a roller bearing that can be driven without causing poor lubrication even under rare lubrication conditions such as at low temperatures in winter and at the start after a long stop.

  Embodiments of the present invention will be described with reference to the drawings.

  A roller bearing 1 (tapered roller bearing) according to an embodiment of the present invention shown in FIG. 1 is used, for example, for a drive device of a railway vehicle, and includes an outer ring 10, an inner ring 20, a plurality of tapered rollers 30, and a cage 40. Are the main components.

  A conical raceway surface 12 is formed on the inner peripheral surface of the outer ring 10, and a conical raceway surface 22 is formed on the outer peripheral surface of the inner ring 20. Between the raceway surface 12 of the outer ring 10 and the raceway surface 22 of the inner ring 20, a plurality of tapered rollers 30 are arranged so as to roll freely as rolling elements. The plurality of tapered rollers 30 are held by the cage 40 at predetermined circumferential intervals.

  A large collar surface 24 is formed on the large diameter side of the raceway surface 22 of the inner ring 20, and a small collar surface 26 is formed on the small diameter side. Numerous grooves 28 and 29 are formed at the boundaries between the raceway surface 22 and the large brim surface 24 and the small brim surface 26, respectively. A plurality of recesses 28a are formed at equal intervals in the circumferential direction in the innermost part of the inner surface of the thin groove 28 on the large brim surface 24 side. By capturing the lubricating oil in the concave portion 28a, the lubricating oil can be held in the thin groove 28, and the lubricity can be improved by supplying the lubricating oil to the sliding portion in the bearing. In particular, in the case of the tapered roller bearing as in the present embodiment, a large load is applied between the large diameter end surface 32 and the large collar surface 24 of the tapered roller 30, and therefore, the large diameter side thin groove 28 close to this portion. By providing the recess 28a in the base plate and retaining the lubricating oil, the lubricity can be improved more effectively.

  In the above-described embodiment, the recesses 28a provided on the inner surface of the thin groove 28 are provided at a plurality of locations at equal intervals in the circumferential direction. However, the present invention is not limited to this. You may form in. Further, if a similar recess is formed in the small-diameter side recess groove 29, the lubricity can be further improved.

  Further, in the above embodiment, the recess 28a is provided in the thinning groove 28 to improve the retention of the lubricating oil in the thinning groove 28, but the present invention is not limited to this. For example, in the example shown in FIG. 2, the narrow groove 28 is formed in a tapered shape toward the opening side. Specifically, the groove width is gradually widened from the opening (groove width W1) to the back of the fillet groove 28, and when the portion where the groove width is maximized (groove width W2) is exceeded, the groove width is gradually increased. Narrow down to the deepest part. As a result, the lubricating oil in the sag groove 28 can be captured by the tapered portion of the slush groove 28, so that the lubricating oil can be reliably held in the slush groove 28. Further, since the internal volume of the fillet groove 28 can be expanded without changing the groove width W1 of the opening, the amount of lubricating oil retained in the fillet groove 28 is increased without affecting the design of other portions. be able to. 2 may be difficult to form by a single process, but in this case, it can be formed by additional machining.

  Further, as in the example shown in FIG. 3, if a plurality of concave portions 28a are formed on the inner surface of the tapered groove 28, both the effect of the tapered shape and the effect of the recessed portion can be obtained. It is possible to further improve the lubricity of the bearing.

  The present invention can be applied not only to a tapered roller bearing but also to other roller bearings such as a cylindrical roller bearing. In addition, the roller bearing of the present invention is not limited to a railway vehicle drive device but can be applied to other uses such as automobiles and industrial machines.

It is sectional drawing of the roller bearing concerning this invention. It is sectional drawing of the roller bearing of another example. It is sectional drawing of the roller bearing of another example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Roller bearing 10 Outer ring 12 Race surface 20 Inner ring 22 Race surface 24 Large brim surface 26 Small brim surface 28, 29 Nuts groove 28a Recess 30 Tapered roller 40 Cage

Claims (5)

An outer ring having a raceway surface on the inner peripheral surface, an inner ring having a raceway surface on the outer peripheral surface, and a plurality of rolling elements arranged to be freely rollable between the raceway surface of the outer ring and the raceway surface of the inner ring, In a roller bearing in which a flange surface is formed at the end of one raceway surface and a thin groove is provided at the boundary between the raceway surface and the collar surface,
A roller bearing characterized in that a plurality of recesses are formed on the inner surface of the relief groove. An outer ring having a raceway surface on the inner peripheral surface, an inner ring having a raceway surface on the outer peripheral surface, and a plurality of rolling elements arranged to be freely rollable between the raceway surface of the outer ring and the raceway surface of the inner ring, In a roller bearing in which a flange surface is formed at the end of one raceway surface and a thin groove is provided at the boundary between the raceway surface and the collar surface,
A roller bearing characterized in that the relief groove is tapered toward the opening side.   The roller bearing according to claim 1, wherein a tapered roller is used as a rolling element, and the plurality of recesses are formed in a hollow groove provided on a large diameter side of the raceway surface of the inner ring.   The roller bearing according to claim 2, wherein a tapered roller is used as a rolling element, and a recess groove provided on the large diameter side of the raceway surface of the inner ring is tapered toward the opening side.   The roller bearing according to claim 1, wherein the roller bearing is used for a drive device of a railway vehicle.

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