JPH07151152A - Solid lubrication deep groove type ball bearing - Google Patents

Abstract

PURPOSE:To provide a solid lubrication deep groove type ball having excellent reliability and long service life capable of feeding and attaching the lubricant to a roller while holding the roller even in the operation at high temperature or in vacuum without causing any cracks in a holder in the assembling operation. CONSTITUTION:A holder of split type of a solid lubrication deep groove type ball bearing consisting of an inner ring 1 having an outer raceway 11, an outer ring 2 having an inner raceway 21 opposite to the outer raceway, a plurality of rollers which are rolled on the raceway groove of the outer raceway and the inner raceway, and a plurality of holders 3 of split type where the self- lubricative solid lubricant is filled in the sintered metal, and the rollers are guided in a split manner is of shape where at least the part to be arranged in the raceway groove has a cylindrical or semi-cylindrical projection. An insert port 6 to insert the holder therefrom is provided in a part of the side surface of the outer ring or the inner ring.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solid-lubricated ball bearing which functions effectively, especially under high temperature, high vacuum, or under the condition that oil or grease cannot be used.

[0002]

2. Description of the Related Art Conventionally, as a retainer made of a self-lubricating material for a deep groove type ball bearing used for high temperature or vacuum, it is necessary to press-fit and incorporate a bearing main body, so that a retainer having a crown shape is used. Since an organic material is used as this self-lubricating material, it cannot be applied in a high vacuum where generated gas is a problem or in a high temperature where heat resistance is required. As a countermeasure, an alloy material filled with a solid lubricant is usually used (for example, JP-A-60-241516,
JP-A-63-246507, JP-A-63-28223
No. 3). As another conventional technique, a cage is provided with a notch in the vicinity of a pocket so as to be easily deformed at the time of press-fitting (actual opening No. 2-132125), and in order to avoid press-fitting of the cage during bearing assembly, the cage There are some separate spacers (for example, Japanese Patent Publication No. 1-28).
248).

[0003]

However, in the above-mentioned first conventional example, the cage is very fragile because it is filled with a solid lubricant such as molybdenum disulfide or tungsten disulfide. When the bearing was press-fitted, there was a problem that the cage was easily cracked. The second conventional example has no effect on a cage made of a very brittle sintered alloy. In the third conventional example, there is a problem that the cage may be broken due to collision between the cages during rotation. Therefore,
INDUSTRIAL APPLICABILITY The present invention is capable of supplying and transferring a lubricant to a rolling element while holding the rolling element even when operating in a high temperature or a vacuum without cracking the cage during assembly, and has a reliable long life. An object is to provide a solid lubrication deep groove type ball bearing.

[0004]

In order to solve the above problems, the present invention provides an inner ring having an outer race, an outer ring having an inner race facing the outer race, and an outer race and an inner race. Solid lubrication deep groove ball consisting of a plurality of rolling elements rolling in raceway grooves and a plurality of split type cages that are filled with a solid lubricant having self-lubricating properties in sintered metal and divide and guide the rolling elements In the bearing, the split type cage has a shape in which at least the portion disposed in the raceway groove has a cylindrical or semi-cylindrical projection, and the outer ring or the inner ring has the cage inserted in a part of the side surface thereof. It has a structure with an insertion port. Further, it is more preferable that the curvature of the cage in the rolling direction is substantially equal to the curvature of the inner ring.

By the above-mentioned means, the insertion opening which is partially cut out on the side surface of the bearing is provided, so that the cage made of the divided self-lubricating material can be inserted inside the bearing.
When the inner ring is rotated, the position of the cage changes, so that other divided cages can be sequentially inserted into the raceway grooves. Since the inserted cage has a cylindrical or semi-cylindrical protrusion shape that fits in the raceway groove, it can hold the rolling element without falling off in the axial direction and reliably supply the lubricant to the rolling element. In addition, since it has a simple shape, it does not crack during assembly and operation.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a deep groove type ball bearing 1 according to an embodiment of the present invention,
FIG. 2 is a sectional view taken along the line AA ′ of FIG. In the figure, 1 is an inner ring having an outer raceway 11 and 2 is an outer raceway 11.
An outer ring 3 having an inner raceway 21 facing to each other is a split type cage for splitting and guiding a plurality of rolling elements 4. The outer ring 2 is provided with an insertion opening 6 in which the shoulder portion 5 is cut so that the cage 3 can be inserted when the bearing is assembled. The material of the cage 3 is 50% tungsten and WS which is a solid lubricant.
A sintered alloy (SL-06U, manufactured by Toshiba Tungaloy Co., Ltd.) in which 50% of ₂ and MoS ₂ were mixed was used. As shown in FIG. 3, the shape of the cage 3 is such that the outer surface of the ring-shaped base body 31 inserted into the space G between the inner peripheral side of the outer ring 2 and the outer peripheral side of the inner ring 1 has an outer raceway surface of the outer ring 2. A projection 32 with a semicircular cross section
Is provided and integrally molded, and then divided into a plurality of individuals. In this case, the curvature on the inner peripheral side is the same as the curvature on the outer peripheral portion of the inner ring 1. The thickness t of the base 31 is the inner ring 1 and the outer ring 2
The shape is smaller than the space G. The assembly of the bearing was as follows. The inner ring 1 is put in the outer ring 2, and the outer circumference of the inner ring 1 is pressed against and brought into contact with one place on the inner circumference of the outer ring 2. A plurality of rolling elements 4 are provided in the raceway groove between the outer ring 2 and the inner ring 1.
Put in. The inner ring 1 is moved to the center of the outer ring 2 to disperse the rolling elements 4 along the raceway grooves. The split cage 3 is inserted into the raceway groove through the insertion port 6. The inner ring 1 is rotated by one rolling element. Since the position of the rolling element 4 moves, the cage 3 is sequentially inserted after the rolling element 4. Stop the insertion opening 6 with a stopper (not shown). In this way, the cage 3 can be assembled smoothly without applying an extra force, and therefore no defects such as cracks were observed. Next, a life evaluation test of this bearing was performed. The sample is model number # 8 with inner diameter φ8, outer diameter φ22, width 7
608 was used. The test conditions are vacuum degree of 10 ⁻⁴ Pa, rotation speed of 1200 r / min, temperature of 300 ° C., thrust load of 27.
It was set to N. As a result, the service life was 3055 h (total rotation speed 2.
No cracks were observed after 2 × 10 ⁸ times), and it was found that the effect was significantly extended compared to the conventional example and the effect was great. FIG. 4 is a perspective view showing another embodiment. This is a deep groove type ball bearing in which the cage 3 has a shape shown in FIGS. 5 (a) and 5 (b). The material used was the same SL-06U sintered alloy as described above. FIG. 5A shows a cage 3 in a cylindrical shape,
FIG. 5B is a division of the O-ring shape. In the case of (b), the curvature on the inner peripheral side is the same as the curvature on the outer peripheral portion of the inner ring 1. When assembled in different deep groove type ball bearings and subjected to the same evaluation test as above, the life was significantly extended compared to the conventional example and good results were obtained. In this embodiment, as the material for the cage, the sintered alloy used was tungsten filled with a solid lubricant, but not limited to this, WS ₂ and M are used.
Stainless SUS310 filled with oS ₂ solid lubricant
You may use S etc.

[0007]

As described above, according to the present invention, a split type cage having a cylindrical or semi-cylindrical projection made of a sintered alloy is used, and therefore cracks are generated during assembly and operation. There is no effect, and it is effective in obtaining a long-life and highly reliable deep groove type ball bearing in an environment such as high temperature and vacuum.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of FIG. 1A-A ′.

FIG. 3 is a perspective view of a split type retainer showing an embodiment of the present invention.

FIG. 4 is a perspective view showing another embodiment of the present invention.

FIG. 5 is a perspective view of a split type retainer showing another embodiment of the present invention.

[Explanation of symbols]

 1: Inner ring 11: Outer raceway 2: Outer race 21: Inner raceway 3: Cage 31: Base body 32: Projection 4: Rolling element 5: Shoulder part 6: Insertion port

Claims (2)

[Claims] 1. An inner ring having an outer race, an outer ring having an inner race facing the outer race, and a plurality of rolling elements rolling in raceways of the outer race and the inner race. In a solid lubrication deep groove type ball bearing comprising a plurality of split type cages made of sintered metal filled with a self-lubricating solid lubricant and dividing and guiding the rolling element, the split type cage is At least the portion disposed in the raceway groove is formed in a shape having a cylindrical or semi-cylindrical projection, and the outer ring or the inner ring has an insertion port for inserting the cage in a part of the side surface thereof. Solid-lubricated deep groove ball bearings. 2. The solid lubrication deep groove ball bearing according to claim 1, wherein a curvature of the cage in a rolling direction is substantially the same as a curvature of the inner ring.