JPH08312653A - Solid lubrication deep groove type ball bearing - Google Patents

Abstract

PURPOSE: To perform the feed and transfer of a lubricant to a rolling body even at a high temperature and in a vacuum as the rolling body is held by a method wherein a release part is arranged at an inner ring or an outer ring and a division holder is inserted through the release part in a space between adjoining rolling bodies. CONSTITUTION: An annular release part 23 extending in parallel from the bottom of an internal wrap track toward one side 22 is arranged at an outer ring 2. A holder material made of a sintered alloy containing a solid lubricant having a semicircular protrusion inserted in the internal track of the outer ring 2 is formed on the outer peripheral side of a ring forming a holder 5 inserted in a space between the inner and outer rings 1 and 2, and divided into a plurality of individuals to form a holder 5. Further, an annular stopper 6 formed of a stainless steel is inserted in an insertion groove 24 in such a manner to be positioned facing the side in an axial direction of the holder 5 and the holder 5 is prevented from dislocation. Since a surplus force is not exerted on the so formed holder 5 to effect assembly, a crack is prevented from occurring. Further, since movement is suppressed by a stopper 6, the holder 5 is prevented from falling in an axial direction.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Conventionally, deep groove type ball bearings used for high temperature and high vacuum have an inner ring having an outer race, an outer ring having an inner race, and a plurality of rolling races rolling on the outer race and the inner race. It is disclosed that a crown-shaped cage made of an alloy material filled with a solid lubricant having a self-lubricating property is provided so that the moving body and the rolling elements do not come into direct contact with each other (for example,
JP-A-60-241516, JP-A-63-24650
No. 7, JP-A-63-282233, etc.). Also, in order to avoid damage to the outer raceway, inner raceway or the lubricating film on the surface of the rolling elements due to press fitting of the cage during assembly of the bearings, a ring-shaped separation type spacer is fitted on the outer circumference of each rolling element, By contacting the separate spacers,
It is disclosed that adjacent rolling elements are prevented from coming into contact with each other (for example, Japanese Patent Publication No. 1-28248). Further, there is one in which an insertion opening for inserting a retainer of a separation type spacer is provided in a part of the side surface of the outer ring or the inner ring.

[0003]

However, in the conventional cage-shaped cage filled with the solid lubricant, molybdenum disulfide and tungsten disulfide are contained in the solid lubricant, so that the entire cage is It was fragile, and there was a problem that when the ball bearing was press-fitted, the cage was easily cracked.
Further, the retainer of the ring-shaped separation type spacer separated for each rolling element has a problem that the retainers may collide with each other during rotation to be broken. Further, in a case where the insertion hole of the retainer of the separation type spacer is provided on a part of the side surface of the outer ring or the inner ring, there is a problem that the rolling element or the cage collides with the corner of the insertion port and the cage is cracked. there were. The present invention is capable of supplying and transferring the lubricant to the rolling elements while holding the rolling elements, even when operating in high temperature or vacuum without cracks in the cage during assembly, which is highly reliable. It is an object of the present invention to provide a solid-lubricated deep groove ball bearing having a long life.

[0004]

In order to solve the above problems, the present invention provides an inner ring having an outer raceway on an outer periphery, an outer ring having an inner raceway facing the outer raceway, and the outer raceway. It has a plurality of rolling elements that roll in raceway grooves formed between the inner raceway and a cage that is made of a sintered alloy containing a solid lubricant and prevents contact between the rolling elements that are adjacent to each other. In a solid-lubricated deep groove ball bearing, an individual cage inserted between each of the rolling elements and an open portion into which the cage can be inserted are provided on the surfaces of the inner ring or the outer ring facing each other. is there. Further, the open portion has a ring-shaped surface extending from one of the bottoms of the outer raceway and the inner raceway toward the one end surface parallel to the axis, and an insertion groove provided in the ring-shaped surface. A ring-shaped stopper is inserted into the insertion groove so as to face the side surface in the axial direction of the cage. Further, the cage has a ring-shaped portion inserted into a space between the inner ring and the outer ring, and a portion inserted into one of an outer raceway of the inner ring and an inner raceway of the outer ring. Be prepared. Further, the cage is formed in a cylindrical shape or a curved cylindrical shape that can be inserted into the outer raceway of the inner ring and the inner raceway of the outer ring.
In addition, the cage is provided with a flat surface portion parallel to the axis of the cylinder. The open portion is formed by cutting out a part of the surfaces of the inner ring or the outer ring facing each other with a plane parallel to the axial direction.

[0005]

By the above means, the inner ring or the outer ring is provided with a ring-shaped or flat open portion, and the divided cage is inserted between the rolling elements adjacent to each other from the open portion. The work is easy, and there is no crack due to the cages colliding with each other, or there is no step at the insertion port, so the cage will not be broken by colliding with the corner of the insertion port and the reliability will be high. .

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of the present invention, and FIG. 2 is A-
It is sectional drawing which follows the A cross section. In the figure, 1 is an inner ring having an outer raceway 11 on the outer circumference, 2 is an outer race having an inner raceway 21 facing the outer raceway 11, which is parallel to the outer circumference from the bottom of the inner raceway 21 toward one side surface 22. A ring-shaped open portion 23 is provided which extends. A ring-shaped insertion groove 24 is provided on the inner circumference of the open portion 23. Reference numeral 3 is a rolling element that is inserted into a raceway groove 4 formed between the outer raceway 11 and the inner raceway 21 and rolls. Reference numeral 5 denotes a plurality of cages inserted between the rolling elements 3. For example, a sintered alloy (Toshiba Tungaloy SL, manufactured by Toshiba Tungaloy Co., Ltd., SL) in which 50% tungsten and 50% solid lubricants WS ₂ and MoS ₂ are mixed -06U) or, as contained WS ₂ and MoS ₂ on the material of the stainless steel SUS310S, it consists sintered alloy containing a solid lubricant, to separate the rolling elements 3 adjacent and inward raceway of the outer ring 2 21 It has a protruding portion to be inserted therein. That is, the cage 5
The shape of C is formed by forming a cage material in which a semicircular projection that is inserted into the inner raceway 21 of the outer ring 2 is provided on the outer peripheral side of the ring that is inserted into the space between the inner ring 1 and the outer ring 2. It is formed by dividing into a plurality of individuals. 6 is a stopper,
For example, the material is a ring made of SUS440, which is inserted into the insertion groove 24 so as to face the axial side surface of the cage 5 and prevents the cage 5 from coming out from the one side surface 22 side of the outer ring 2. . The method of assembling the bearing is as follows. (1) Put the inner ring 1 inside the outer ring 2 and
The outer periphery of the inner ring 1 is pressed against and brought into contact with the place. (2) Put a plurality of rolling elements 3 in the raceway groove 4 formed between the inner raceway 21 of the outer ring 2 and the outer raceway 11 of the inner ring 1. (3) The inner ring 1 is moved to the center of the outer ring 2 to disperse the rolling elements 3 along the raceway grooves 4. (4) The cage 5 is inserted into the raceway groove 4 from the opening 23 provided on the one side surface 22 side of the outer ring 2. (5) Insert the stopper 6 into the insertion groove 24. In this way, the cage 5 can be assembled without applying an excessive force, so that cracks and the like do not occur. Also,
Even if the rolling element 3 and the retainer 5 move in the axial direction during rotation, the stopper 6 limits the amount of movement, so that the rolling element 3 and the cage 5 do not fall off in the axial direction. Further, the opening 2 into which the cage 5 is inserted
Since 3 has no step, it collides with the rolling element 3
The cage 5 and the cage 5 will not be damaged.

FIG. 3 is a perspective view showing a second embodiment of the present invention, and FIG. 4 is a sectional view thereof. In this case, the shape of the cage 5 of the first embodiment is changed to a cylindrical shape or a curved cylindrical shape formed by dividing a ring having a circular cross section in the circumferential direction. The diameter d of the cross section of the cage 5 is smaller than the diameter D of the rolling element 3 and larger than the gap length G ₀ between the outer circumference of the inner ring 1 and the outer ring 2, and between the outer circumference of the inner ring 1 and the open portion 23 of the outer ring 2. It is made smaller than the gap length G ₁ . This simplifies the manufacturing of the cage 5 and the insertion work into the raceway groove 4. FIG. 5 is a sectional view showing a third embodiment of the present invention. in this case,
A shield plate 7 for preventing the intrusion of dust is attached to both sides between the outer ring 2 and the inner ring 1 of the second embodiment, and a stopper 6 is provided on the rolling member side surface of the shield plate 7 on the open portion 23 side,
The stopper 6 is fixed to the outer ring 2 together with the shield plate 7. FIG. 6 is a perspective view showing a fourth embodiment of the present invention, FIG. 7 is a sectional view thereof, and FIG. 8 is an explanatory view showing an operation of assembling the cage. In this case, instead of the opening portion 23 provided on the entire inner circumference of the outer ring 2 of the second embodiment, the inner ring 1
An opening 12 cut out in a plane parallel to the shaft center of the bearing is provided on a part of the outer peripheral surface of the bearing. Further, the outer surface of the cage 5 having a cylindrical or curved columnar shape is parallel to the axis of the cage 5. Flat part 51
Is provided. The diameter d of the cage 5 is larger than the gap G ₀ between the inner ring 1 and the outer ring 2, and the height h of the cage 5 when the flat surface portion 51 is the bottom surface is equal to the open portion 12 of the inner ring 1 and the outer ring 2.
It is smaller than the length H between the inner circumference and the inner circumference. When the retainer 5 is mounted in the raceway groove, it can be easily inserted by inserting the flat portion 51 of the retainer 5 into the open portion 12 of the inner ring 1, and at the same time, the outer raceway 11 of the inner ring 1 is always inserted. Since it moves within the raceway groove of the inner raceway 21 of the outer ring 2, it does not fall outside. In the above embodiment, an example in which the ring-shaped open portion is provided in the outer ring and an example in which the flat open portion is provided in a part of the inner ring have been described.
It may be provided on any of the outer rings.

[0008]

As described above, according to the present invention, the inner ring or the outer ring is provided with the opening, and the divided cage is inserted between the rolling elements adjacent to the opening. The assembly work is easy, and there is no crack due to the cages colliding with each other, or there is no step at the insertion port, so the cage does not collide with the corners of the insertion port and the cage does not crack. There is an effect that a deep groove type ball bearing having a long life and high reliability can be provided in an environment such as a vacuum.

[Brief description of drawings]

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

FIG. 2 is a sectional view showing a first embodiment of the present invention.

FIG. 3 is a perspective view showing a second embodiment of the present invention.

FIG. 4 is a sectional view showing a second embodiment of the present invention.

FIG. 5 is a sectional view showing a third embodiment of the present invention.

FIG. 6 is a perspective view showing a fourth embodiment of the present invention.

FIG. 7 is a sectional view showing a fourth embodiment of the present invention.

FIG. 8 is a sectional view illustrating an operation of inserting the cage according to the fourth embodiment of the present invention.

[Explanation of symbols]

1 inner ring, 11 outer raceway, 12 open part, 2 outer ring,
21 inner track, 22 one side surface, 23 open part, 24
Insertion groove, 3 rolling elements, 4 raceway grooves, 5 cage, 51
Flat part, 6 stoppers, 7 shield plates,

Claims (6)

[Claims] 1. An inner ring having an outer raceway on an outer periphery, an outer ring having an inner raceway facing the outer raceway, and a raceway groove formed between the outer raceway and the inner raceway. In a solid-lubricated deep groove ball bearing having a plurality of moving rolling elements and a cage made of a sintered alloy containing a solid lubricant and preventing contact between the adjacent rolling elements, between the rolling elements. A solid-lubricated deep groove ball bearing, characterized in that an inserted individual cage and an open portion into which the cage can be inserted are provided on the surfaces of the inner ring or the outer ring facing each other. 2. The opening portion has a ring-shaped surface extending from one of the bottom portion of the outer raceway and the inner raceway toward one end surface parallel to the axis, and an insertion provided on the ring-shaped surface. The solid lubrication deep groove ball bearing according to claim 1, further comprising a groove, wherein a ring-shaped stopper is inserted into the insertion groove so as to face an axial side surface of the cage. 3. The cage is inserted into either a ring-shaped portion inserted into a space between the inner ring and the outer ring, and an outer raceway of the inner ring or an inner raceway of the outer ring. The solid lubrication deep groove ball bearing according to claim 1 or 2, further comprising a portion. 4. The solid lubricating deep groove ball bearing according to claim 1, wherein the cage is formed in a cylindrical shape or a curved cylindrical shape that can be inserted into the outer raceway of the inner ring and the inner raceway of the outer ring. 5. The solid lubrication deep groove ball bearing according to claim 4, wherein the cage is provided with a plane portion parallel to the axis of the cylinder. 6. The solid-lubricated deep groove ball bearing according to claim 5, wherein the open portion is formed by cutting out a part of surfaces of the inner ring or the outer ring facing each other in a plane parallel to the axial direction.