JPH0645697Y2 - Rolling bearing having cage supported concentrically with bearing ring - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to improving the operating performance of a rolling bearing.

(Prior Art) In a conventional rolling bearing, as shown in FIGS. 3 and 4, a cage 2 holding a rolling element 1 in an annular shape at a constant interval is arranged between an inner ring 3 and an outer ring 4, and the rolling element 1 is It is rotatably fitted in the raceway groove 3a of the inner ring 3 and the raceway groove 4a of the outer ring 4 so that the cage 2 can slightly move in the radial direction within the gap 5 between the inner ring 3 and the outer ring 4. Therefore, as shown in FIGS. 3 and 4, when the bearing is attached to the horizontal shaft, the retainer slips down due to gravity, and the center of the retainer cannot be kept the same as the center of the shaft and the bearing.

(Problems to be Solved by the Invention) In the above-mentioned conventional technique, when the rolling bearing is used for the horizontal shaft, the cage 2 descends downward in the gap 5 due to gravity.
There is a problem in that the cage 2 is eccentrically rotated during the rotation of the horizontal shaft 6 and causes vibration or noise, which adversely affects the bearing performance.

(Means for Solving Problems) The present invention aims to solve the above problems,
The outer ring both side shoulders, which face the outer peripheral surfaces of both side shoulders of the cage that retains the rolling elements annularly at regular intervals, radially pass through a small hole or only a small hole having a pocket on the inner peripheral surface of the outer ring, and A plurality of hydrostatic bearings are arranged at equal intervals on the circumference, and a hydrostatic bearing is formed between the inner peripheral surface of the outer ring and the outer peripheral surface of the cage by injecting a pressure fluid into the small holes.

Hereinafter, a detailed description will be given based on the embodiment shown in FIG. Reference numeral 10 denotes a cage that holds rolling elements 11 in an annular shape at regular intervals, and is arranged between an inner ring 12 and an outer ring 13, and the rolling elements 11 are rotatably fitted in raceway grooves 12a of the inner ring 12 and raceway grooves 13a of the outer ring 13. Of the outer ring 13 facing the outer peripheral surface 10b of the shoulder 10 on both sides of the cage 10,
A plurality of small holes 14 having pockets 15 are formed in the inner peripheral surface 13b of the outer ring in a radial direction, and a plurality of small holes 14 are arranged at equal intervals around the circumference. The housing 16 arranged on the outer periphery of the outer ring 13 communicates with the small holes 14. The pressure fluid supply hole 17 is formed.

Next, the operation will be described. When pressure lubricating oil or pressure air is introduced from the pressure fluid supply hole 17, a hydrostatic oil film bearing or a hydrostatic air bearing is formed between the outer ring inner peripheral surface 13b and the retainer 10 outer peripheral surface 10b, and the retainer 10 is concentric with the inner ring 12. Supported by static pressure. The pocket 15 may be omitted, if necessary, when the pressurized air flows in.

(Effect) According to the present invention, the small holes or small holes having the pockets on the inner peripheral surface of the outer ring are provided on the both outer shoulders of the outer ring facing the outer peripheral surfaces of the both side shoulders of the cage holding the rolling elements in a ring shape at regular intervals. Since a plurality of radial bearings are arranged at equal intervals around the circumference, and a pressure fluid is introduced into the small holes to form a hydrostatic bearing between the inner peripheral surface of the outer ring and the outer peripheral surface of the cage, Since the cage of the rolling element and the inner ring are supported concentrically and can rotate, the cause of vibration generation can be eliminated, noise can be prevented, and bearing performance can be improved.

In addition, a hydrostatic bearing is formed between the outer ring shoulder portion and the cage shoulder portion, resulting in a compact size.

[Brief description of drawings]

1 is a front sectional view of an embodiment of the present invention, and FIG. 2 is a sectional view of FIG.
AA side sectional view, FIG. 3 is a front sectional view of a conventional bearing device, and FIG. 4 is a side view of FIG. 10 …… Cage, 10b …… Cage shoulder outer surface, 11 …… Rolling element 12 …… Inner ring, 13 …… Outer ring, 13b …… Outer wheel shoulder inner surface 14 …… Small hole, 15 …… Pocket, 16 …… Housing 17 …… Pressure fluid supply hole

Claims (1)

[Scope of utility model registration request] 1. A small hole or a small hole having a pocket on the inner peripheral surface of the outer ring is radially formed on both outer shoulders of the outer ring facing the outer peripheral surfaces of the both side shoulders of a retainer that retains rolling elements annularly at regular intervals. A rolling bearing in which a plurality of through holes are arranged at equal intervals around the circumference and a hydrostatic bearing is formed between the inner peripheral surface of the outer ring and the outer peripheral surface of the cage by injecting a pressure fluid into the small holes.