JP2012041940A - Retainer of cylindrical roller bearing and cylindrical roller bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a retainer having a lubricating structure capable of satisfactorily performing lubrication on an outer ring side in the retainer of a cylindrical rolling bearing of a rotating outer ring and stationary inner ring type.SOLUTION: In the retainer of the cylindrical rolling bearing including a pair of annular parts 12 opposed to each other in an axial direction, column parts 13 provided at a fixed interval between the annular parts 12 and pockets 14 formed between the column parts 13, annular grooves 17 are provided to inner peripheral surfaces of the annular parts 12 and oil supply holes 18 communicating with the annular grooves 17 are provided to the inner surfaces of the annular parts 12 opposed to each other in the axial direction at parts of the pockets 14.

Description

  The present invention relates to a cylindrical roller bearing retainer and a cylindrical roller bearing using the retainer, and more particularly to a lubrication structure using a retainer in an outer ring rotating / inner ring stationary type cylindrical roller bearing.

  2. Description of the Related Art Conventionally, cylindrical roller bearings used in outer ring rotation / inner ring stationary types are known as bearings used in reduction gears, transmissions, and the like (Patent Documents 1 and 2).

  In this case, the oil lubrication structure of the cylindrical roller bearing has a structure in which an oil supply path is provided in the stationary shaft, and an oil supply hole of the inner ring fitted to the stationary shaft is communicated with the oil supply path. The cage is a so-called outer ring guide type that rotates in contact with the inner diameter surface of the outer ring, but the cage itself does not contribute to the lubrication of the bearing.

  On the other hand, a ball bearing having a lubrication structure in which the cage is involved in the lubrication of the bearing is known (Patent Document 3). This ball bearing is an inner ring rotating / outer ring stationary type, and the cage is guided by balls. Lubricating oil is supplied to the inner ring end face by jet injection.

  Lubricating oil supplied by jet injection toward the inner ring end face is accumulated in an annular groove provided on the inner ring end face and overflows from the annular groove and is supplied to the cage side (FIG. 13 of Patent Document 3). It is supplied to the cage side through an oil supply hole communicating with the annular groove (FIG. 16). An annular groove is provided on the inner diameter surface of both ends of the cage, and the radial oil supply holes communicating with the annular groove are opened toward the shoulder portions on both sides of the raceway surface of the outer ring, and the lubricating oil is directed toward the shoulder portions. To supply.

JP 2000-27874 A JP 2009-228703 A JP 2009-174701 A (FIGS. 13 and 16)

  In the conventional outer ring rotating / inner ring stationary type cylindrical roller bearing disclosed in Patent Documents 1 and 2, since the inner ring is in a stationary state, centrifugal force does not act on the inner ring. Therefore, centrifugal force does not act on the lubricating oil supplied from the oil supply hole of the inner ring to the inside of the bearing. For this reason, in order to sufficiently supply oil to the outer ring side, it is necessary to set the lubricating oil supply amount and the supply hydraulic pressure to be larger than a certain level. However, when the oil supply amount or the oil supply pressure increases, there is a problem that the torque of the bearing increases.

  The bearing disclosed in Patent Document 3 is fundamentally different from the outer ring rotating / inner ring stationary type cylindrical roller bearing in that it is a ball bearing and is an inner ring rotating / outer ring stationary type. In addition, since the lubricating oil is not supplied directly to the cage, but is supplied to the cage via the inner ring, it is difficult to divert it to a bearing with an outer ring rotating / inner ring stationary type. .

  Furthermore, since the lubricating oil supplied from the oil supply hole of the cage is supplied toward the shoulder of the outer ring, the lubricating oil that moves inward in the axial direction and toward the raceway surface, Divided into things that move to. For this reason, there also exists a problem that the oil supply efficiency to the inside of a bearing is low.

  Accordingly, the present invention solves the above-described problems, and a cylindrical roller bearing retainer having a lubrication structure capable of satisfactorily lubricating the outer ring side in the outer ring rotating / inner ring stationary type cylindrical roller bearing retainer, and its retainer. It is an object of the present invention to provide a used cylindrical roller bearing.

  A first means related to a cage of a cylindrical roller bearing that solves the above-described problem is a pair of annular portions opposed in the axial direction, and column portions provided at regular intervals in the circumferential direction between the annular portions. In the cylindrical roller bearing cage comprising cylindrical roller storage pockets formed between the pillar portions, an annular groove is provided on the inner peripheral surface of the annular portion, and each pocket portion is opposed in the axial direction. An oil supply hole communicating with the annular groove is provided on the inner surface of the annular portion.

  The second means related to the cage of the cylindrical roller bearing that solves the above-mentioned problem is similarly provided with a pair of annular portions facing each other in the axial direction and a certain interval in the circumferential direction between the annular portions. In the cylindrical roller bearing retainer in which a pocket for storing cylindrical rollers is formed by the formed column portion, an annular groove is provided on the inner peripheral surface of the annular portion, and the annular grooves on both sides are formed on the inner diameter surface of the column portion. The communicating groove is provided, and the bottom of the communicating groove is provided with an oil supply hole opened to the outer diameter surface of the column portion.

  The cylindrical roller bearing that solves the above-described problems uses the cage according to the first means or the second means as the cage. This cylindrical roller bearing is used in an outer ring rotating / inner ring stationary type, and as a lubrication method, jet lubrication in which lubricating oil is supplied in the form of an oil jet at a high pressure from a nozzle is employed. Lubricating oil is sprayed from the outside of the bearing end face, and the supplied lubricating oil hits the bearing and scatters to accumulate in the annular groove of the cage.

  In the case of the cage of the first means, oil is supplied to the both end surfaces of the cylindrical roller inside the pocket and the raceway surface of the outer ring from the oil supply hole connected to the annular groove by centrifugal force accompanying the rotation of the cage.

  Further, in the case of the cage of the second means, the lubricating oil accumulated in the annular groove is similarly applied to the raceway surface of the outer ring from the communication groove of the column portion through the oil supply hole by the centrifugal force accompanying the rotation of the cage. Supplied.

  As described above, the cage according to the present invention is used for the outer ring rotating / inner ring stationary type and the cylindrical roller bearing adopting the jet lubrication, so that the cage has an annular groove and an oil supply hole connected to the annular groove. Centrifugal force can be applied to the lubricating oil supplied to the pocket and the outer ring raceway surface. For this reason, the lubricating oil can be appropriately supplied to the outer ring side without increasing the amount of oil supply or the oil supply pressure, and therefore without increasing the torque.

  Further, in the case of the cage of the first means, since the oil supply hole is provided so as to open to the inner surface of the annular portion facing the axial direction of the pocket portion, the lubricating oil is used for the end surface of the cylindrical roller and the raceway surface of the outer ring. To be actively supplied. Further, in the case of the cage of the second means, the oil supply hole is provided so as to open to the outer diameter surface of the column portion, so that the oil can be directly supplied to the raceway surface of the outer ring. Therefore, in any case, there is an effect of high oil supply efficiency.

  Furthermore, the supply amount of the lubricating oil can be appropriately set by adjusting the sizes of the annular groove and the oil supply hole.

FIG. 1 is a perspective view illustrating a cage according to the first embodiment. FIG. 2 is a front view of the same. 3 is an enlarged cross-sectional view taken along line X1-X1 of FIG. 4 (a) to 4 (c) are enlarged sectional views of modified examples showing the same parts as those in FIG. FIG. 5 is a sectional view of a cylindrical roller bearing using the cage of the first embodiment in use. FIG. 6 is a perspective view showing a cage according to the second embodiment. FIG. 7 is a front view of the same. 8A is a cross-sectional view taken along line X2-X2 in FIG. 7, and FIG. 8B is a view taken in the direction of arrows X3-X3 in FIG.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
[Embodiment 1]

  As shown in FIGS. 1 to 5, the retainer 11 according to the first embodiment is provided with a large number of column portions 13 at regular intervals in the circumferential direction between a pair of annular portions 12 facing in the axial direction. The pair of annular portions 12 are connected and integrated by these column portions 13. A pocket 14 is formed between the column parts 13, and cylindrical rollers 15 (see FIGS. 2 and 3) are accommodated in the pocket 14.

  A roller holding convex portion 16 protruding toward the inner diameter side of the cage 11 is provided at the center of the inner diameter surface (axial side surface) of the column portion 13, and the column portion 13 adjacent to one roller holding convex portion 16 is provided. The cylindrical roller 15 in the pocket 14 is held by the roller holding convex portion 16 so as to prevent the cylindrical roller 15 from coming out to the inner diameter side. The outer diameter surface of the column portion 13 is slightly recessed by a chamfer 19 (see FIG. 3) provided at the inner edge of the annular portion 12, and the outer diameter side surface of the column portion 13 retains oil due to the recess. It becomes.

  Annular grooves 17 are provided on the inner peripheral surface of each annular part 12 over the entire circumference. Refueling holes 18 communicating with the annular groove 17 are provided on the inner surfaces of the pockets 14 in the axial direction.

  In the case of the illustration, each annular groove 17 is shown over the entire inner peripheral surface of the cage 11, but these annular grooves 17 may be provided intermittently on the inner peripheral surface. In that case, the same number as the number of pockets 14 may be provided, or a plurality of grooves may be provided equally.

  As shown in FIG. 3, the oil supply hole 18 is opened at a right angle to the inner surface of the pocket 14, and as shown in FIG. 4A, the oil supply hole 18 is inclined toward the outer diameter direction of the cage 11. As shown in FIG. Further, as shown in FIG. 4B, the end faces of the oil supply hole 18 and the cylindrical roller 15 have the same inclination angle and a relatively large chamfer, that is, a large chamfer 19a on the open end face. You may make it provide the clearance gap 21 between.

  Further, as shown in FIG. 4 (c), a guide piece 22 inclined toward the annular groove 17 is provided over the entire circumference at the opening edge on the pocket 14 side among the left and right opening edges of the annular groove 17. Can take.

  A shallow recess 20 for oil sump is provided at the center of the inner surface facing the pocket 14 of the pillar 13.

  Next, a cylindrical roller bearing 23 using the cage 11 and a usage example thereof will be described with reference to FIG. The cylindrical roller bearing 23 includes an inner ring 24 and an outer ring 25, a large number of cylindrical rollers 15 interposed between these raceway surfaces, and the retainer 11 that holds the large number of cylindrical rollers 15 at regular intervals. .

  The inner ring 24 is fitted to the stationary shaft 26, and the outer ring 25 is fitted to the inner diameter surface of the rotating body 27 such as a roller. The cylindrical roller bearing 23 is used in an outer ring rotating / inner ring stationary type. The retainer 11 is a so-called outer ring guide that is guided by contacting the outer ring 25 in the load region.

  The lubrication method is based on jet lubrication in which an oil jet is ejected from the nozzle 33 installed outside the bearing toward the bearing end surface between the inner ring 24 and the outer ring 25 to supply lubricating oil.

  When a load acts on the rotating body 27 during rotation, the cage 11 rotates in contact with the outer ring 25. The lubricating oil that has entered the annular groove 17 is lifted upward by the action of centrifugal force accompanying rotation. Further, under the action of centrifugal force, the oil supply holes 18 are distributed and supplied to the end surface of the cylindrical roller 15 and the raceway surface of the outer ring 25 for each pocket 14 to lubricate these portions (see white arrows in FIG. 3).

  In addition, between the cylindrical roller 15 and the column part 13, the lubricating oil collected in the shallow recessed part 20 (refer FIG. 1) contributes to the lubrication of this part.

  When the oil supply hole 18 is inclined in the outer diameter direction as shown in FIG. 4A, centrifugal force is more likely to act on the lubricating oil. In the case where the large chamfer 19a shown in FIG. 4B is provided, a gap 21 is formed between the cylindrical roller 15 and the end surface of the cylindrical roller 15, and the gap 21 becomes an oil reservoir, which promotes lubrication of the end surface of the cylindrical roller 15. . Furthermore, when the guide piece 22 as shown in FIG. 4C is provided, the lubricating oil can be smoothly introduced into the annular groove 17.

In any case, the oil supply amount can be set to an appropriate amount by appropriately adjusting the sizes of the annular groove 17 and the oil supply hole 18.
[Embodiment 2]

  Next, the cage 11 according to the second embodiment shown in FIGS. 6 to 8 will be described. The basic structure of the cage 11 is the same as the cage of the first embodiment described above (see FIGS. 1 to 5). That is, between the pair of annular portions 12 facing each other in the axial direction, a large number of column portions 13 are provided at regular intervals in the circumferential direction, and the pair of annular portions 12 are connected and integrated by these column portions 13. Yes. A pocket 14 is provided between the column portions 13, and a cylindrical roller 15 is accommodated in the pocket 14.

  A roller holding convex portion 16 protruding toward the inner diameter side of the cage 11 is provided at the central portion of the axial side surface of the column portion 13, and the cylindrical roller 15 in the pocket 14 is held by a pair of adjacent roller holding convex portions 16. By doing so, it is prevented from coming out to the inner diameter side. Annular grooves 17 are provided on the inner peripheral surface of each annular part 12 over the entire circumference.

  In the case of the first embodiment, the oil supply holes 18 communicating with the annular grooves 17 on both sides are provided on the inner surfaces facing each other in the axial direction of the pockets 14, but in the case of the second embodiment, instead of this, A communication groove 31 communicating with the annular grooves 17 on both sides is provided on the inner diameter surface of the column portion 13, and the outer diameter surface of the column portion 13 (the surface facing the raceway surface 30 of the outer ring 25) at the groove bottom of the communication groove 31. The oil supply holes 32 opened at the two are provided at two locations.

  The communication groove 31 separates the roller holding convex portion 16 provided in the column portion 13 on both sides of the communication groove 31 (see FIG. 8B).

  The cylindrical roller bearing 23 using the cage 11 is an outer ring rotating / inner ring stationary type as in the first embodiment (see FIG. 5), the cage 11 is an outer ring guide, and the lubrication method is jet. Lubrication is adopted.

  In this case, the lubricating oil lifted upward by the annular groove 17 due to the centrifugal force accompanying the rotation passes through the oil supply hole 32 from the communication groove 31 as shown by the white arrows in FIGS. It is supplied to the outer diameter surface of the column 13 and the raceway surface 30 of the outer ring 25 facing the outer surface. The outer diameter surface of the column portion 13 is slightly recessed by a chamfer 19 provided at the inner edge of the annular portion 12, and the oil supply hole 32 is not blocked by the raceway surface 30 of the outer ring 25. Further, due to the recess, the surface on the outer diameter side of the column portion 13 becomes an oil reservoir.

11 Cage 12 Annular part 13 Column part 14 Pocket 15 Cylindrical roller 16 Roller holding convex part 17 Annular groove 18 Oil supply hole 19 Chamfer 19a Large chamfer 20 Recess 21 Clearance 22 Guide piece 23 Cylindrical roller bearing 24 Inner ring 25 Outer ring 26 Stationary shaft 27 Rotation Body 30 Raceway surface 31 Communication groove 32 Oil supply hole 33 Nozzle

Claims (12)

  A pair of annular portions facing each other in the axial direction, a column portion provided between the annular portions at a constant interval in the circumferential direction, and a pocket for storing cylindrical rollers formed between the column portions. In the cage of the cylindrical roller bearing, an annular groove is provided on the inner peripheral surface of the annular portion, and an oil supply hole communicating with the annular groove is provided on the inner surface of the annular portion opposed in the axial direction in each pocket portion. A cylindrical roller bearing cage.   The cylindrical roller bearing retainer according to claim 1 or 2, wherein the annular groove is provided over the entire circumference.   The cage of a cylindrical roller bearing according to claim 1 or 2, wherein the oil supply hole is inclined toward the outer diameter surface of the cage as it extends from the annular groove to the open end of the inner surface of the annular portion.   A chamfer is formed at the inner edge of the outer diameter surface of the annular portion, and the outer diameter surface of the column portion is recessed with respect to the outer diameter surface of the annular portion by the height of the chamfer to have a small diameter. The cage for a cylindrical roller bearing according to any one of claims 1 to 3.   The cylindrical roller bearing retainer according to claim 4, wherein the chamfer is formed to be relatively large, and the oil supply hole is opened at a chamfered portion thereof.   The cylindrical roller bearing retainer according to any one of claims 1 to 5, wherein a guide piece inclined toward the annular groove side is provided over the entire circumference along the inner edge of the annular groove.   The cylindrical roller bearing retainer according to any one of claims 1 to 6, wherein a roller holding convex portion is provided at a central portion of the inner diameter surface of the column portion.   In a cylindrical roller bearing retainer in which a pocket for storing cylindrical rollers is formed by a pair of annular portions opposed in the axial direction and pillar portions provided between the annular portions at a constant interval in the circumferential direction, An annular groove is provided on the inner peripheral surface of the annular portion, a communication groove communicating with the annular grooves on both sides is provided on the inner diameter surface of the column portion, and an outer diameter surface of the column portion is provided on the groove bottom of the communication groove. A cage for a cylindrical roller bearing, wherein an open oiling hole is provided.   The cylindrical roller bearing retainer according to claim 8, wherein a roller holding convex portion is provided at a central portion of the inner diameter surface of the column portion, and the roller holding convex portion is divided into two by the communication groove.   A chamfer is formed at the inner edge of the outer diameter surface of the annular portion, and the outer diameter surface of the column portion is recessed with respect to the outer diameter surface of the annular portion by the height of the chamfer to have a small diameter. The cylindrical roller bearing retainer according to claim 8 or 9, wherein the retainer is a cylindrical roller bearing.   A cylindrical roller bearing in which cylindrical rollers are interposed between raceways facing the inner ring and the outer ring, and the cylindrical rollers are held at a constant interval in the circumferential direction by a cage, wherein the cage is any one of claims 1 to 10. A cylindrical roller bearing characterized by being the cage described above.   The inner ring is fitted to the outer diameter surface of a stationary shaft, the outer ring is an outer ring rotating / inner ring stationary type integrated with a rotating body, the cage guide is an outer ring guide, and the lubrication method is jet lubrication. The cylindrical roller bearing according to claim 11, wherein the cylindrical roller bearing is provided.

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