CN211202609U - High-speed ball bearing adopting special-shaped spacer to replace retainer - Google Patents

Abstract

The utility model discloses a high-speed ball bearing using a special-shaped spacer instead of a cage, which comprises a bearing outer ring, a bearing inner ring, a spherical rolling body and a spacer. The spacer is distributed between any two adjacent spherical rolling bodies and the bearing. In the approximate triangular gap formed by the three inner rings, the spacer is in contact with the two spherical rolling elements and has a certain gap with the inner ring of the bearing. The number of spacers is the same as the number of spherical rolling elements. , the rolling friction is generated between the isolator and the spherical rolling elements, and the calorific value is far less than the calorific value generated by the frictional collision between the cage and the spherical rolling elements in the traditional bearing. , can improve the limit speed and friction performance of high-speed motorized spindle bearings in my country, and can be processed and transformed on the basis of existing bearings, easy to achieve standardized manufacturing, low cost and good interchangeability.

Description

A high-speed ball bearing using a special-shaped spacer instead of a cage

technical field

The utility model relates to the application field of high-speed and ultra-high-speed bearings, in particular to a new structure high-speed ball bearing which is suitable for various electric spindles, high-end CNC machine tools, electric motors, aero-engines, etc. and adopts a special-shaped spacer instead of a cage.

Background technique

High-end CNC machine tool technology is one of the important development goals proposed by "Made in China 2025", and the electric spindle is a key component that affects the performance of CNC machine tools. However, the performance reduction or failure of the bearing caused by the heating of the bearing greatly affects the limit speed of the bearing. The sliding friction between the bearing cage and the rolling element is the main factor that causes the bearing to heat up. Therefore, the high-speed ball bearing of the present utility model adopts a special-shaped The isolator replaces the new structure of the cage, improves the limit speed and friction performance of the high-speed motorized spindle bearing in my country, and can be processed and transformed on the basis of the existing bearing, which is easy to achieve standardized manufacturing, low cost and good interchangeability.

SUMMARY OF THE INVENTION

The purpose of the present utility model is to provide a high-speed ball bearing using a special-shaped spacer to replace the cage, so as to meet the requirements of our country for the increasing limit speed and friction performance of the high-speed motorized spindle bearing;

For achieving the above object, the technical scheme of the present utility model is as follows:

A high-speed ball bearing using a special-shaped spacer instead of a cage, including a bearing outer ring, a bearing inner ring, a spherical rolling body, and a spacer, the bearing outer ring and the bearing inner ring are arranged coaxially, and the inner side of the bearing outer ring is arranged. A raceway for axial positioning of spherical rolling elements is machined on the outside of the bearing inner ring. The spherical rolling elements are spheres and are evenly distributed between the bearing inner ring and the bearing outer ring along the circumferential direction. It is a cylinder with a rotating body formed by a concave special curve around the axis of the isolator connected to the cylindrical surfaces at both ends of the isolator in the middle. The isolator and the rolling body are spaced apart and located in any two adjacent spherical rolling bodies and bearings. In the gap between the three rings, the spacer is in rolling contact with the two spherical balls and has a certain gap with the inner ring of the bearing during operation, and the number of spacers is the same as the number of spherical rolling elements;

According to another embodiment of the present invention, it further includes that the bearing outer ring and the bearing inner ring can be any deep groove ball bearing of the same specification or an angular contact ball bearing of the same specification at the same time;

According to another embodiment of the present invention, it further includes that the special curves in the revolving body formed by the concave special curve around the axis of the isolator connected by the cylindrical surfaces at both ends of the spacer are the same in the same type of bearing, but different in the same type of bearing. The type of spacer curve is circular arc, hyperbola, involute, V-shaped or partial ellipse;

According to another embodiment of the present invention, it further includes that the number of the spacers and the spherical rolling elements is the same;

The beneficial effects of the utility model are as follows: a high-speed ball bearing using a special-shaped spacer instead of a cage is provided, and the original cage is removed by introducing a special-shaped spacer between the spherical rolling bodies, and the cage and the cage are eliminated. The sliding friction and collision of the rolling elements of the bearing, and the spacer undertakes the function of the original cage to separate the spherical rolling elements from each other. Since the spacer can rotate, the friction generated between the spacer and the spherical rolling elements is rolling friction. The calorific value generated by friction is far less than the calorific value generated by sliding friction between the original cage and the rolling elements, so that the limit rotation speed and friction performance of the bearing can be improved, and because the utility model can be processed and transformed on the basis of the existing bearing, It is easy to realize standardized manufacturing, with low cost and good interchangeability.

Description of drawings

Fig. 1 is the front view when the bearing of the utility model is in motion;

Fig. 2 is A-A sectional view and partial enlarged view when the bearing of the utility model is in motion;

Fig. 3 is the B-B sectional view when the bearing of the utility model is in motion;

4 is a partial enlarged view of the sectional view of the bearing of the utility model at rest and the shortest distance between two adjacent balls of the rolling element;

5 is a C-C sectional view of the bearing of the utility model when it is stationary;

6 is a schematic diagram of the isolator of the present invention;

Among them: 1 bearing outer ring, 2 bearing inner ring, 3 spherical rolling elements, 4 spacers.

Detailed ways

As shown in Figure 1, a high-speed ball bearing using a special-shaped spacer instead of a cage is characterized in that: it comprises a bearing outer ring (1) and a bearing inner ring (2) coaxial with the bearing outer ring (1), The bearing outer ring (1) and the bearing inner ring (2) are filled with a certain number of spherical rolling bodies (3) and spacers (4) having the same number as the spherical rolling bodies (3). 4) Located between any two adjacent spherical rolling elements (3) and the gap formed by the bearing inner ring (2); as shown in Figure 2, when the high-speed ball bearing is working, the spacer (4) is located in the bearing On the raceway of the ring (2) and there is a certain gap with the bearing inner ring (2); as shown in Figure 3, the smallest diameter of the spacer (4) is tangent to the adjacent spherical rolling body (3) and is in the bearing. There is a gap in the raceway on the ring (2), and the specific working form is: the bearing outer ring (1) is fixed, the bearing inner ring (2) rotates at a high speed, and the bearing inner ring (2) drives the spherical rolling element (3) to rotate, The spherical rolling element (3) drives the spacer (4) to rotate around the bearing axis, and the spacer (4) is completely separated from the bearing inner ring (2) due to centrifugal action. The minimum clearance of the two spherical rolling elements (3) is therefore still in the approximately triangular region formed between the two adjacent spherical rolling elements (3) and the bearing inner ring (2). Almost the same, the two adjacent spherical rolling bodies (3) and the spacer (4) have the same speed at the contact point, and because the spacer (4) is a revolving body, when the spacer rotates at a certain speed, it can roll with the adjacent two balls. Rolling friction is formed between the bodies (3), and when the bearing starts to run stably, the isolator (4) begins to accelerate its rotation due to the friction between the spherical rolling body (3) and the isolator (4). (4) When the linear velocity at the contact point with the spherical rolling element (3) is equal, at this time, due to the nature of friction, the rotation speed of the spacer (4) is stable, and a stable formation is formed between the spacer (4) and the spherical rolling element (3). Therefore, the harmful friction inside the bearing is reduced, the heat generation of the bearing is reduced, and the limit speed of the bearing is increased; as shown in Figure 4, when the bearing is placed at rest, the spherical rolling element (3) and the The spacer (4) gathers downward, and at this time, the middle of the lower spacer (4) is tangent to the adjacent spherical rolling element (3), and at the same time, both ends of the spacer (4) are also in contact with the bearing inner ring (2); As shown in Figure 5, the shortest distance between two adjacent spherical rolling elements (3) is smaller than the minimum diameter of the spacer (4), and the spacer (4) is restricted by the two adjacent spherical rolling elements (3) and cannot be separated from the adjacent ones The area formed by the two spherical rolling elements (3) and the bearing inner ring (2); as shown in Figure 6, the two sides of the spacer (4) are cylinders, and the middle part is the inner part connected to the cylindrical surfaces at both ends of the spacer. The concave special curve is a revolving body formed by rotating around the axis of the spacer, and the spacer (4) is symmetrical about the circular section where the smallest diameter of the middle part is located.

Claims (2)

1. The utility model provides an adopt high-speed ball bearing of special-shaped isolator replacement holder which characterized in that: the spherical rolling bodies (3) are mutually isolated by using a special-shaped isolating body (4) to replace the function of a traditional retainer, the two side parts of the isolating body (4) are cylinders, the middle part of the isolating body is a revolving body formed by the rotation of an inwards concave special curve connected with the cylindrical surfaces at the two ends of the isolating body around the axis of the isolating body, the isolating body (4) is symmetrical about the circular section of the minimum diameter position of the middle part, the working position of the isolating body (4) is positioned in an approximately triangular area enclosed by two adjacent spherical rolling bodies (3) and a bearing inner ring (2), and when the bearing stops and operates, the minimum distance between the two adjacent spherical rolling bodies (3) is smaller than the minimum diameter of the isolating body (4).

2. A high speed ball bearing using a shaped spacer in place of a cage according to claim 1, further characterized in that: the special curve used for forming the solid body by the middle section of the isolating body through rotation can be a circular arc line, a hyperbolic curve, an involute, a V-shaped line or a partial elliptic line.

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