JP2006200676A - Roller bearing and bearing oil supply method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To compatibly attain the prevention of a temperature rise in a bearing, the prevention of generation of sludge, and an increase in a penetrating oil quantity in the axial direction. <P>SOLUTION: This roller bearing 40 is formed by nonseparably integrating three members of an inner race 41 having a collar part 41b on both ends in the axial direction of a raceway surface 41a, a plurality of needle-like rollers 42 arranged along the raceway surface 41a, and a cage 43 for holding the needle-like rollers 42, and is interposed between a housing 10 and a rotary shaft 20, and is supplied with oil from the side. For example, a cross-sectional V-shaped oil introducing groove 43d penetrating over the whole in the axial direction is arranged in a part in the circumferential direction of the cage 43. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a roller bearing such as a needle roller bearing and a bearing oil supply method.

  Generally, the amount of penetrating oil, which is one of the bearing internal oil flow characteristics, affects bearing performance such as life, seizure, and torque. Since the roller rolling surface is in rolling contact with the raceway surface of the raceway, if the lubrication conditions deteriorate, such as when the amount of oil is small, the cooling effect at this part may be reduced and seizure may occur. is there. Therefore, it is important to secure an amount of penetrating oil that contributes to lubrication and cooling inside the bearing.

  In addition, there is an application for supplying oil to other members using oil penetrating the bearing. In this case, it is necessary to stably penetrate the oil amount.

  With respect to such a roller bearing, as shown in FIG. 6, a roller bearing 40 is interposed between the housing 10 and the rotary shaft 20, and oil is supplied from an oil supply nozzle 31 of an oil supply device 30 disposed on the side thereof. Some are supplied by hydraulic injection (see Patent Document 1). The roller bearing 40 includes flange portions 41 b at both ends in the axial direction of the inner ring 41, a plurality of needle rollers 42 are arranged on the raceway surface 41 a of the inner ring 41, and each needle roller 42 is connected to the circumference of the cage 43. A plurality of pocket holes 42c are held in the direction. In addition, a structure is provided in which the annular portions 43 a on both sides in the axial direction of the cage 43 are opposed to the outer diameter surfaces of the flange portions 41 b at both ends in the axial direction of the inner ring 41. In such oil supply to the roller bearing 40, since the narrow facing gap between the housing 10 and the rotary shaft 40 is further narrowed by the roller bearing 40, it is difficult to supply oil from the side of the roller bearing 40. Since the bearing 40 is rotating at a high speed, the oil from the oil supply nozzle 31 is bounced back to the retainer 43 and is not easily introduced into the roller bearing 40. Therefore, in such oil supply, the amount of penetrating oil is reduced and the bearing temperature rises to influence the bearing performance.

  Further, the needle rollers 42 are accommodated in all the pocket holes 43c of the cage 43, and the gap between the flange portions 41b on both sides in the axial direction of the inner ring 41 and the annular portions 43a on both sides in the axial direction of the cage 43 is narrow. The inner diameter side space between the retainer 43 and the inner ring 41 is almost in a sealed state, and passes through a narrow gap between the flange portion 41b of the inner ring 41 and the annular portion 43a of the retainer 43 to enter the inner diameter side space. The supplied oil stays in the inner diameter side space and the amount of penetrating oil decreases, and the oil tends to be oxidized by agitation by high-speed rotation of the bearing and become a cause of sludge generation.

Furthermore, the oil that has been supplied to the outer diameter side space between the housing 10 and the cage 43 tends to stay on the housing side due to the centrifugal force acting on the oil itself during the bearing operation, and in addition, is retained. Since the needle rollers 42 are accommodated in all the pocket holes 42c of the container 43, the outer diameter side space and the inner diameter side space are separated, and the oil in the inner diameter side space is transferred to the outer diameter side space. It is difficult to penetrate, and as a whole, the amount of penetrating oil supplied to the roller bearing 40 tends to be insufficient, and the lubrication state tends to deteriorate.
JP-A-10-292281

  Therefore, the problem to be solved by the present invention is to make it possible to simultaneously achieve prevention of bearing temperature rise, generation of sludge, and increase in the amount of oil penetrating in the axial direction.

  The roller bearing according to the present invention is a roller bearing composed only of a cage, wherein oil introduction grooves are provided by bending in one or several circumferential directions of the cage. It is.

  According to this roller bearing, it is possible to increase the amount of penetrating oil penetrating from one axial side to the other axial side through the oil introduction groove. As a result, the lubrication state inside the bearing is good and the bearing temperature can be prevented from rising, and the oil can penetrate from the inner diameter side space of the bearing to the outer diameter side space. This eliminates the cause of sludge generation and sludge generation, increases the amount of oil penetration, and provides a roller bearing with excellent lubrication and excellent bearing performance.

  Further, the roller bearing according to the present invention comprises at least a plurality of rollers arranged along the raceway surface and a cage in which pockets for holding the rollers are arranged in the circumferential direction. The inner ring provided with a flange on the inner ring and the retainer place guided by the outer diameter surface of the flange on the inner ring are made non-separable and integrated between the housing and the rotating shaft, and In a roller bearing in which oil is supplied from the side toward the gap between the flange portion of the inner ring and one end portion in the axial direction of the cage, the entire axial direction is applied to one or several locations in the circumferential direction of the cage. An oil introduction groove penetrating therethrough is provided by bending.

  According to this roller bearing of the present invention, since the oil introduction groove having a V-shaped cross section, for example, is formed in the circumferential direction of the cage over the entire axial direction, the roller bearing is supplied from the side. The oil that has been introduced is introduced into the oil introduction groove along with the rotation of the roller bearing and is rotated helically in the oil introduction groove. As a result, the inside of the roller bearing is shifted from one side in the axial direction to the other side in the axial direction. The amount of penetrating oil penetrating to the side can be increased. As a result, the lubrication state inside the bearing is good and the bearing temperature can be prevented from rising, and the oil can penetrate from the inner diameter side space of the bearing to the outer diameter side space. This eliminates the cause of sludge generation and sludge generation, increases the amount of oil penetration, and provides a roller bearing with excellent lubrication and excellent bearing performance.

  The bearing oil supply method according to the present invention comprises at least a plurality of rollers arranged along the raceway surface and a cage in which pockets for holding the rollers are arranged in the circumferential direction, and in particular, at both axial ends of the raceway surface. A roller bearing in which the three members of the inner ring provided with the flange part and the retainer place guided by the outer diameter surface of the flange part of the inner ring are non-separably integrated is interposed between the housing and the rotating shaft, In the bearing oil supply method in which oil is supplied from the side toward the gap between the flange of the inner ring and the one end of the cage in the axial direction, the oil supply target is the above-described roller bearing. The supplied oil can be introduced into the oil introduction groove with the rotation of the roller bearing, and can be rotated spirally in the oil introduction groove to increase the amount of penetrating oil.

  According to the present invention, it is possible to prevent the bearing temperature from increasing, prevent the generation of sludge, and increase the amount of penetrating oil in the axial direction.

  Hereinafter, a roller bearing and a bearing oil supply method according to embodiments of the present invention will be described with reference to the accompanying drawings. In the present invention, as an example, the present invention is applied to a needle roller bearing in the embodiment. However, the present invention is not limited to a needle roller bearing, and can of course be applied to other types of roller bearings. .

  1 to 4 relate to a housing, a rotating shaft, and an embodiment interposed therebetween, FIG. 1 is a sectional view showing the housing, the rotating shaft, a needle roller bearing, and an oil supply device, and FIG. FIG. 3 is a perspective view of the entire cage, and FIG. 4 is an enlarged perspective view showing the main part of the cage.

  Referring to these drawings, 10 is a housing, 20 is a rotating shaft, 30 is an oil supply device, and 40 is a needle roller bearing. The oil supply device 30 includes an oil supply nozzle 31 that faces the gap between the housing 10 and the rotary shaft 20. The oil supply nozzle 31 is configured to inject oil by hydraulic pressure and supply it to the needle roller bearing 40. The needle roller bearing 40 includes an inner ring 41, a plurality of needle rollers 42, and a cage 43. The inner ring 41 includes flange portions 41b at both ends in the axial direction of the raceway surface 41a. The needle rollers 42 are disposed along the raceway surface 41 a of the inner ring 41. The cage 43 holds the needle rollers 42 so that the three members including the inner ring 41 and the needle rollers 42 are not separated and integrated.

  The retainer 43 is installed in a circumferential direction between a pair of axial portions (axial end portions) 43a guided by the outer diameter surfaces 41b1 of both flange portions 41b of the inner ring 41 and both the annular portions 43a. And a plurality of cage pillars 43b.

  The retainer column 43b is positioned radially outward from the roller PCD, and holds the needle rollers 42 in a state of retaining with the inner ring 41 so that the three members are not separated.

  In the above-described configuration, the roller bearing 40 according to the embodiment includes the oil introduction groove 43d having a V-shaped cross section that penetrates the retainer column 43b of the retainer 43 through the entire axial direction at several circumferential positions on the outer diameter surface. Is provided by bending. The oil introduction groove 43d is formed by bending the inclined surface 43d1 having a descending slope and the inclined surface 43d2 having an ascending slope facing each other in the circumferential direction into a V-shaped cross section by pressing or the like. Yes.

  According to the roller bearing 40 of the embodiment, since the oil introduction groove 43d having a V-shaped cross section is provided in a part of the circumferential direction of the cage 43 along the entire axial direction, the roller bearing 40 is supplied from the side thereof. As a result of the rotation of the roller bearing 43, the introduced oil is introduced into the oil introduction groove 43d and spirally rotated in the oil introduction groove 55. As a result, the inside of the roller bearing 40 is moved from one side in the axial direction which is the side. The amount of penetrating oil penetrating to the other side in the axial direction can be increased. As a result, the lubrication state inside the bearing is good and the bearing temperature can be prevented from rising, and the oil can penetrate from the inner diameter side space of the bearing to the outer diameter side space. The reason why sludge is generated by staying in the cylinder is eliminated, and the amount of oil penetrating is increased. Thus, it is possible to provide a roller bearing with excellent lubrication and excellent bearing performance.

  The oil introduction groove 43d is provided in the retainer column 43b of the retainer 43. As shown in FIG. 5 (a) and FIG. 5 (b) which is a sectional view thereof, the oil introduction groove 43d is bent in the pocket hole 43c of the retainer 43. Can be formed. According to this configuration, the needle roller 42 cannot be accommodated in the pocket hole 43c, and the amount of penetrating oil penetrating from the inner diameter side space to the outer diameter side space through the pocket hole is increased, and the lubrication is further improved. Can be.

  The oil supply method for the needle roller bearing 40 will be described. Oil is injected from the oil supply nozzle 31 of the oil supply device 30 to the side of the needle roller bearing 40 by hydraulic pressure. From the oil supply nozzle 31, the oil is injected and supplied to the side surface of the needle roller bearing 40 so as to spread in a facing gap between the housing 10 and the rotary shaft 20. In the needle roller bearing 40, the oil is spirally rotated while being introduced and led out from the groove inlet to the groove outlet by the oil introduction groove 43d, so that the oil is supplied to the inner diameter side space between the inner ring 41 and the retainer 43. The oil thus pierced into the outer diameter side space between the housing 10 and the cage 43, and the oil supplied to the outer diameter side space is pushed out by the oil penetrating from the inner diameter side space and penetrates to the outside. To do.

  With the above lubrication, the oil penetrates the inner diameter side space and the outer diameter side space well, so that the lubrication inside the bearing is improved and the increase in the bearing temperature due to insufficient lubrication as in the conventional case is prevented. Therefore, sludge generation is prevented and the amount of oil penetrating oil can be increased.

  The present invention is not limited to the above-described embodiment, and includes various changes or modifications within the scope described in the claims.

1 is a cross-sectional view showing a roller bearing according to a first embodiment. It is sectional drawing which follows the AA line of FIG. It is a perspective view of the whole holder | retainer of FIG. It is a perspective view which expands and shows the principal part of the holder | retainer of FIG. It is a perspective view which expands and shows the modification of an oil introduction groove | channel. It is sectional drawing which shows the conventional roller bearing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Housing 20 Rotating shaft 30 Oil supply device 31 Oil supply nozzle 40 Needle roller bearing 41 Inner ring 42 Needle roller 43 Cage 43a Ring part 43b Cage pillar 43c Pocket hole 43d Oil introduction groove

Claims (3)

  A roller bearing comprising only a cage portion, wherein an oil introduction groove is provided by bending at one or several locations in the circumferential direction of the cage.   There are three types of bearings: an inner ring with flanges at both ends in the axial direction of the raceway surface, a plurality of rollers arranged along the raceway surface, and a cage whose axial ends are guided by the outer diameter surface of the inner ring. In a roller bearing that is separated and integrated, is interposed between a housing and a rotating shaft, and oil is supplied from the side toward the gap between the flange portion of the inner ring and one axial end of the cage. A roller bearing characterized in that an oil introduction groove penetrating the entire axial direction is provided by bending in one or several places in the circumferential direction of the cage. The three parts of the inner ring having flanges on both ends in the axial direction of the raceway surface, a plurality of rollers arranged along the raceway surface, and the cage whose axial ends are guided by the outer diameter surface of the buttocks of the inner ring are hidden. Roller bearing that separates and integrates the roller bearing between the housing and the rotating shaft, and supplies oil from the side toward the gap between the flange of the inner ring and one end of the cage in the axial direction. 3. A bearing oil supply method according to claim 1, wherein a roller bearing according to claim 1 or 2 is used as an object of oil supply.

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