JP2007315450A - Low temperature rise type self-aligning rolling bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a low temperature rise type self-aligning rolling bearing capable of improving the inflow and discharge of a lubricant between the roller end face and the guide side face of a guide ring, preventing oil film shortage by preventing a temperature rise of the lubricant interposed therebetween, eliminating metallic contact therebetween, increasing the allowable rotating speed of the bearing, and extending the service life of the bearing. <P>SOLUTION: In this self-aligning rolling bearing, double row rollers 3, 3 are disposed between an outer ring 1 and an inner ring 2, and a floating guide ring 5 is disposed between the double row rollers 3, 3. At least one peripheral groove 5-2, 5-2 is formed on each guide face 5-1, 5-1 of each floating guide ring 5 facing end faces 3-1, 3-1 of the double row rollers 3, 3. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an improvement in the performance of a self-aligning roller bearing that is mainly used in industrial machines including a press, a blower, a pump, and a speed reducer, and is used to support heavy radial loads.

An example of a conventional self-aligning roller bearing is shown in FIG. In a conventional self-aligning roller bearing, when two rows of rollers 3 float between the outer ring 1 and the inner ring 2 and face each other with the guide ring 5 interposed therebetween, an axial load is applied to the rollers, or there is no skew. When this occurs, the roller end surface 3-1 and the roller guide surface 5-1 of the floating guide wheel come into contact with each other, and these surfaces come into sliding contact. For this reason, if the lubrication between them is poor, the roller guide surface 5-1 will be worn and wear powder will be generated and will adhere to the bearing raceway surface. There was a life span. In conventional self-aligning roller bearings, the rollers are in rolling contact with the outer ring and the inner ring, and the amount of heat generated from these is small. However, the rollers, cages, and floating guide wheels are in sliding contact, and the amount of heat generated from them occupies most of the heat generated by the self-aligning roller bearing. This generated heat deteriorates the lubricant including lubricant and grease. Then, the oil film of the lubricant is cut, and the outer ring, inner ring, roller, cage, and floating guide ring of the self-aligning roller bearing make metal contact with the contact surface, causing surface damage, which causes bearing smearing, seizure, etc. It is often damaged by. It is known that the amount of heat of a self-aligning roller bearing increases in proportion to the number of rotations, and the allowable number of rotations of the bearing can be increased by reducing the amount of heat generated. In the conventional self-aligning roller bearing, the liquid level 6-1 of the lubricating oil is set so that about half of the roller at the bottom of the bearing is used when the bearing is stopped.
In Patent Document 1, the roller attitude is controlled so that the roller end surface edge portion and the floating guide wheel guide side surface are less galling, and the roller end surface edge portion and the floating guide wheel guide side surface are in contact with each other so as to suppress wear. The guide wheel guide side surface is open to the inner ring side at a desired angle so as to create an angular clearance with respect to the roller end surface. Further, Patent Document 2 proposes a curved surface provided on the guide side surface of the guide wheel so that the roller end surface and the guide wheel guide side surface are only in point contact.
JP 2000-65052 A JP 2001-517759 A

An example of the conventional self-aligning roller bearing shown in FIG. 4 is a floating guide wheel 5 inserted between two rows of rollers. When skew occurs such that the posture of the roller 3 is broken or an axial load is applied to the roller 3. When working, the end surface 3-1 of the roller 3 rotates while being pressed against the guide side surface 5-1 of the floating guide wheel 5. When the lubrication state in this case is observed, the clearance S between the end surface 3-1 of the roller 3 and the guide side surface 5-1 of the floating guide wheel 5 is small, and these are in a parallel positional relationship, and thus are generated by sliding contact. There is a drawback that lubricant that has deteriorated due to heat is difficult to be discharged, and an undegraded lubricant supplied from the outside is difficult to enter. Therefore, poor lubrication is likely to occur, metal contact occurs, the end surface 3-1 of the roller 3 is worn, and wear powder is generated and adheres to the bearing outer ring raceway surface 1-1 or the inner ring raceway surface 2-1. As a result, it was found that while the roller 3 is rotating, the wear powder is stepped on to damage the raceway surface, resulting in a problem that the bearing has a short life. Further, when the above-mentioned lubrication failure occurs, the amount of heat generated at the end surface 3-1 of the lubricating roller 3 and the guide side surface 5-1 of the floating guide wheel 5 becomes enormous, and the heat is seized. It may occur.
In Patent Documents 1 and 2, the contact amount between the roller end surface and the guide wheel guide side surface is reduced, and the wear of the roller end surface and the floating guide wheel guide side surface is suppressed. If it is reduced, it cannot be used for supporting heavy radial loads, and sufficient supply of lubricant to increase the allowable rotational speed of the bearing is insufficient.

  The object of the present invention is to improve the inflow and discharge of the lubricant between the roller end face and the guide side surface of the guide wheel, and prevent the oil film from being cut by preventing the temperature rise of the lubricant interposed between them. An object of the present invention is to provide a low temperature rising type self-aligning roller bearing capable of eliminating these metal contacts, increasing the allowable rotational speed of the bearing, and extending the life of the bearing.

  For this reason, the present invention provides a self-aligning roller bearing in which two rows of rollers are disposed between an outer ring and an inner ring, and a floating guide ring is disposed between the two rows of rollers. The above-described problems of the conventional products have been solved by a low temperature rising self-aligning roller bearing characterized in that at least one circumferential groove is provided on each guide side surface of the floating guide wheel.

  With this configuration, in the present invention, at least one circumferential groove is provided on each side of the floating guide wheel guide side surface facing the roller end surfaces of the two rows, so that the guide side surface of the floating guide wheel is between the end surface and the guide side surface. Sufficient lubricant is supplied, and the supplied lubricant is properly discharged after being used for lubrication, improving the inflow and discharge of the lubricant between the roller end face and the guide wheel guide side face, and interposing between them Prevents oil film breakage by preventing the temperature rise of the lubricant to be used and eliminates these metal contacts, so there is no deterioration due to frictional heat generated on these contact surfaces, so metal contact due to breakage of the lubricating oil film occurs Therefore, a low temperature rising type self-aligning roller bearing that can increase the allowable rotation speed of the bearing whose upper limit is determined by the generation of frictional heat and extend the life of the bearing because there is no generation of wear powder. To provide It was.

Preferably, a plurality of circumferential grooves are provided on each guide side surface of the floating guide ring facing the two rows of roller end faces, and the plurality of circumferential grooves are arranged in order from the radially inner side to the one axial end portion. Is closed, and then the other axial end is closed, whereby the inflow and discharge of the lubricant can be further improved.
More preferably, each guide side surface of the floating guide ring facing the two rows of roller end surfaces includes an intermediate portion parallel to the intermediate roller end surface, as viewed in the radial direction, the roller end surface, and the floating guide ring guide side surface. By having the inner part and the outer part provided with a watermark between them, the inflow and discharge of the lubricant can be further improved.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a lower half longitudinal sectional view showing a state where a low temperature rising self-aligning roller bearing according to a first embodiment of the present invention is immersed in a lubricating oil, and FIG. 2 is a low temperature rising according to a second embodiment. Lower half longitudinal section showing the same state of the type spherical roller bearing, FIG. 3 is a lower half longitudinal section showing the same state of the low temperature rising type spherical roller bearing of the third embodiment of the present invention FIG. 4 is a plan view of the lower half of a conventional self-aligning roller bearing in a similar state.

  As shown in FIG. 1, the low temperature rising type self-aligning roller bearing according to the first embodiment of the present invention has two rows of rollers 3, 3 arranged between an outer ring 1 and an inner ring 2, and two rows. In the self-aligning roller bearing in which the floating guide ring 5 is arranged between the rollers 3 and 3, each guide side surface of the floating guide ring 5 facing the end faces 3-1 and 3-1 of the two rows of rollers 3 and 3 5- 1 and 5-1 are provided with one circumferential groove 5-2 and 5-2. The floating guide ring 5 provided with circumferential grooves 5-2 and 5-2 on each guide side surface 5-1 and 5-1 is located between the two rows of rollers 3 and 3 of the self-aligning roller bearing. The end faces 3-1 and 3-1 of the rollers 3 and 3 are guided so that these rollers do not tilt. In the case of one circumferential groove 5-2, 5-2 as shown in FIG. 1, it is set so as to be located below the liquid level 6-1 of the lubricating oil 6, and the lubricating oil 6 is placed at the bottom of the bearing. The circumferential grooves 5-2 and 5-2 are supplied, and the lubricating oil 6 supplied at this position causes the end faces 3-1 and 3 of the circumferential grooves 5-2, 5-2 and 3 and 3 by the revolving motion of the rollers. -1 and supplied to the portion not immersed in the lubricating oil 6, the amount of which is guided by the guide groove 5 of the conventional floating guide wheel 5 shown in FIG. -1 and 5-1 only, or increased in comparison with the case where the contact amount between the roller end surface and the guide wheel guide side surface is reduced in Patent Documents 1 and 2. If it is not possible to guarantee that the groove is positioned below the liquid level or the amount of the lubricating oil 6, the lubricating oil 6 that has flowed through the circumferential movement of the rollers 3 along the circumferential grooves 5-2 and 5-2 It is supplied between the guide side surfaces 5-1 and 5-1 and the end surfaces 3-1 and 3-1 of the floating guide wheel 5 by rotation. In the case of grease lubrication, the circumferential grooves 5-2 and 5-2 are filled with grease due to the revolution and rotation of the roller in the place where the grease exists at the beginning of rotation, and the roller rotates in a place where there is no grease. It is supplied by the movement between the guide side surfaces 5-1 and 5-1 of the floating guide wheel 6 between the end surfaces 3-1 and 3-1.

  With this configuration, in the low temperature rising self-aligning roller bearing according to the first embodiment of the present invention, at least one circumferential groove is provided on each guide side surface of the floating guide wheel facing the two roller end faces. As a result, sufficient lubricant is supplied between the guide side surface and the end surface of the floating guide wheel, and the supplied lubricant is appropriately discharged after being used for lubrication, and between the roller end surface and the guide wheel guide side surface. Improves inflow and discharge of lubricant, prevents temperature rise of lubricant intervening between them, prevents oil film breakage, and eliminates these metal contacts, so it deteriorates due to frictional heat generated at these contact surfaces Since no metal contact due to the rupture of the lubricating oil film occurs, the allowable rotational speed of the bearing, which is determined by the frictional heat, is increased, and the life of the bearing is extended because no wear powder is generated. Low temperature rise type Dochokokoro became as providing a roller bearing.

  The low temperature rising type self-aligning roller bearing of the second embodiment of the present invention shown in FIG. 2 has two rows of roller end surfaces 3-1, 3-1 and guide side surfaces 5-1, 3-1 of the floating guide wheels 5 facing each other. Two circumferential grooves 5-2, 5-2, 5-3, 5-3 are provided on -1, and two circumferential directions on each guide side surface 5-1, 5-1 From the radially inner side, the inner circumferential grooves 5-2 and 5-2 are closed at one end (right side) in the axial direction, and then the outer circumferential grooves 5-3 and 5-3 are the other. The side end (left side) of the axial direction is closed, so that the lubricating oil 6 is prevented from flowing out from the axial end of each guide side surface 5-1, 5-1 and below the amount of lubricating oil 6 or the liquid level. Even when it is not possible to guarantee that the circumferential groove is located, lubrication is performed between the roller end surfaces 3-1 and 3-1 and the guide side surfaces 5-1 and 5-1 of the guide wheel 5 during the revolution and rotation of the rollers. By holding the oil 6, the inflow and discharge of the lubricant can be further improved.

  The low temperature rising type self-aligning roller bearing of the third embodiment of the present invention shown in FIG. 3 has two rows of rollers 3, 3 floating guide wheels facing the end faces 3-1, 3-1 and 5 guide side faces. 1 and 5-1, each guide side surface of the floating guide wheel 5 provided with one circumferential groove 5-2 and 5-2 on each surface and disposed between two rows of rollers 3 and 5-1, 5-1 is a gap between the intermediate portion parallel to the roller end surface in the middle, and between the roller end surfaces 3-1 and 3-1 and the floating guide wheel 5 guide side surfaces 5-1 and 5-1. And an inner portion and an outer portion provided with Vin and Vout. When circumferential grooves 5-2 and 5-2 are located below the surface of the lubricating oil 6, contact between the roller end surfaces 3-1 and 3-1 and the floating guide wheel 5 guide side surfaces 5-1 and 5-1. The lubricating oil 6 is held in the watermark Vin and Vout spaces, and is supplied to the portion not immersed in the lubricating oil 6 through the watermark Vin and Vout spaces by the revolving motion of the rollers. When the circumferential grooves 5-2 and 5-2 are located above the surface, the lubricating oil 6 is held only by the watermark Vout below the liquid surface, and is similarly immersed in the lubricating oil 6 by the revolving motion of the rollers. The supply amount of the lubricating oil 6 is increased by the effect of the Vin and Vout spaces, and the inflow and discharge of the lubricant can be improved. Even in a position where it is not immersed in the lubricating oil 6, the lubricating oil 6 is held in the watermark Vin and Vout spaces, and the lubricating oil 6 is lifted by the rotation of the roller 3, and the guide wheel 5 guide side face 5-1 and 5-1 end face Supplied between 3-1. In the case of grease lubrication, the grease is filled in the wedge-shaped cross-section spaces (Vin and Vout) by the revolution and rotation of the roller in the place where the grease is present at the beginning of rotation, and the roller rotates in a place where there is no grease. The floating guide wheel 5 is supplied between the guide side surfaces 5-1 and 5-1 and the end surfaces 3-1 and 3-1.

The lower half longitudinal cross-sectional view which shows the state immersed in the lubricating oil of the low temperature rising self-aligning roller bearing of the 1st Embodiment of this invention. The lower half longitudinal cross-sectional view which shows the same state of the low temperature rising type self-aligning roller bearing of 2nd Embodiment. The lower half longitudinal cross-sectional view which shows the same state of the low temperature rising type self-aligning roller bearing of 3rd Embodiment. The lower half longitudinal cross-sectional view which shows the same state of the conventional self-aligning roller bearing.

Explanation of symbols

1: Outer ring, 2: Inner ring, 3: Roller, 3-1, 3-1: Roller end face, 5: Floating guide wheel
5-1, 5-1: Guide side of floating guide wheel

Claims (3)

  In a self-aligning roller bearing in which two rows of rollers are arranged between an outer ring and an inner ring, and a floating guide ring is arranged between the two rows of rollers, each of the floating guide wheels facing the roller end surfaces of the two rows A low temperature rising self-aligning roller bearing, characterized in that at least one circumferential groove is provided on a side surface of the guide.   A plurality of circumferential grooves are provided on each guide side surface of the floating guide wheel facing the roller end surfaces of the two rows, and the plurality of circumferential grooves are sequentially closed from the radially inner side, with one axial end being closed, 2. The low temperature rising self-aligning roller bearing according to claim 1, wherein the other axial end is closed. The guide side surfaces of the floating guide wheels facing the two rows of roller end surfaces are located between the intermediate portion parallel to the intermediate roller end surfaces and the roller end surfaces and the floating guide wheel guide side surfaces in the radial direction. 2. The low temperature rising type self-aligning roller bearing according to claim 1, further comprising an inner portion and an outer portion provided with ridges.

Images