Cylindrical roller bearing

Abstract

The invention relates to a cylindrical roller bearing comprising a cage made of a synthetic resin. The cage of the cylindrical roller bearing includes an annular section, a plurality of pillars that extend axially in an integrated, continuous manner from the inside surface of the annular section, and a plurality of pockets, which are formed between the inner circumferential direction side faces of adjacent pillars, and hold the cylindrical rollers in a freely rotatable manner. The circumferential direction side faces of the pillars incorporate a circular arc surface formed in both the inside and outside diameter directions from the pocket PCD which passes through the pocket center of the pocket, and a roll-off section (lubricant reservoir) provided at the tip end inner circumferential section, wherein the peripheral edge of the lubricant reservoir is preferably formed so as to be inclined in an opposite direction to the direction of inclination of the pillars relative to the center axis that occurs when the pillars undergo outward elastic deformation due to centrifugal force.

Description

[0001] This application is a divisional application with an application date of September 29, 2004, an application number of 200410080624.5, and an invention name of "cylindrical roller bearing". technical field [0002] The present invention relates to a cylindrical roller bearing including a cage made of synthetic resin, and more particularly to a cylindrical roller bearing for supporting a spindle rotating at high speed, such as a machine tool. Background technique [0003] It is well known that in machine tools, such as machining centers, numerically controlled lathes and presses, the main shaft is usually supported by bearings which rotate freely relative to the machine body. The orientation of the spindle is divided into two main categories according to the type of machine, vertical (where the axis is arranged along a vertical direction) and horizontal (where the axis is arranged along a horizontal direction). In addition, oil lubrication such as grease lubrication, ai...

AI Technical Summary

Problems solved by technology

[0011] However, while cylindrical roller bearings designed in this conventional manner exhibit sufficient capacity at low and high rotational speeds, there is a risk of an excessive increase in bearing temperature due to elastic deformation of the columns 14b of the cage 14

In addition, even when the method disclosed in Patent References 1 and 2 is adopted, and the straight surface 14b12 is formed on the column 14b of the cage 14 designed in the above-mentioned conventional manner, at more than 13000 rpm or around this value for example (or when When the dmn value exceeds 1650000 or around this value), the bearing temperature will still rise excessively

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