Low noise bearings

Abstract

The present invention relates to a low-noise bearing, which comprises an outer ring, an inner ring, an intermediate ring, a cage and balls; the outer ring is arranged on the periphery of the inner ring, an intermediate ring is arranged between the outer ring and the inner ring, a common cage is arranged in the space between the intermediate ring and the outer ring and the space between the intermediate ring and the inner ring, balls are arranged in the cage, and one cage is composed of inner and outer rows of balls; the outer ring is fixed, and the inner ring is connected to the motor shaft and rotates, thereby reducing the rotation speed of the bearing balls and thus reducing the bearing noise. The low-noise bearing of the present invention adopts two rows of balls, three rings and a ball cage to form a bearing, and the purpose of reducing the bearing noise is achieved by reducing the rotation speed of the bearing balls. Compared with ordinary bearings, under the same conditions, the ball rotation speed of the low-noise bearing of the present invention can be reduced by about half, so that the noise of the bearing is greatly reduced, meeting the needs of engineering applications.

Description

Technical Field

[0001] The invention belongs to mechanical devices and relates to bearings, in particular to a low-noise bearing. Background Art

[0002] As we all know, when mechanical devices rotate at high speed, bearings will generate a lot of noise. For a long time, reducing the noise of high-speed bearings has been one of the important research topics for engineering and technical personnel.

[0003] It is generally believed that the noise of bearings is closely related to the machining accuracy of bearings. In engineering, the machining accuracy of bearings is very high, but with the increase of bearing speed, the requirements for bearing machining accuracy have exceeded the level that can be achieved technically. Therefore, the only way to reduce the noise of high-speed bearings is to reduce the speed of the bearing balls. This seemingly contradictory requirement can actually be achieved.

[0004] In view of this, technicians in this field are committed to developing a low-noise bearing to reduce the noise of high-speed bearings. Summary of the invention

[0005] The task of the present invention is to provide a low-noise bearing, which reduces the rotation speed of the bearing balls, thereby reducing the bearing noise, thereby solving the problems existing in the above-mentioned prior art.

[0006] The technical solution of the present invention is as follows:

[0007] A low-noise bearing comprises a bearing outer ring, a bearing inner ring, a bearing intermediate ring, a ball retainer and balls;

[0008] The bearing outer ring is arranged on the periphery of the bearing inner ring, a bearing intermediate ring is arranged between the bearing outer ring and the bearing inner ring, a common ball cage is arranged in the space between the bearing intermediate ring and the bearing outer ring and in the space between the bearing intermediate ring and the bearing inner ring, and balls are arranged in the ball cage, and one ball cage is composed of inner and outer rows of balls;

[0009] The outer ring of the bearing is fixed, and the inner ring of the bearing is connected to the motor shaft and rotates, thereby reducing the rotation speed of the bearing balls and thus reducing the bearing noise.

[0010] The sum of the angular velocities of the inner and outer rows of balls is equal to the angular velocity of the balls in the common bearing.

[0011] The rotational angular velocity of the inner row of balls is equal to the ratio of the difference between the tangential velocity of the inner ring of the bearing and the tangential velocity of the middle ring of the bearing to the diameter of the balls.

[0012] The angular velocity of the outer row of balls is equal to the ratio of the tangential velocity of the bearing intermediate ring to the diameter of the balls.

[0013] The ratio of the angular velocities of the inner and outer rows of balls is equal to the ratio of the distances from the center of the balls to the center of the bearing.

[0014] The low-noise bearing of the present invention uses two rows of balls, three rings and a ball cage to form a bearing, and reduces the bearing noise by reducing the rotation speed of the bearing balls. Compared with ordinary bearings, under the same conditions, the ball rotation speed of the low-noise bearing of the present invention can be reduced by about half, so that the bearing noise is greatly reduced, meeting the needs of engineering applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a low-noise bearing of the present invention.

[0016] Figure 2 is the Figure 1 Left side view of the bearing shown.

[0017] Reference numerals:

[0018] 1 is the outer ring of the bearing, 2 is the inner ring of the bearing, 3 is the ball cage, 4 is the intermediate ring of the bearing, and 5 is the ball. DETAILED DESCRIPTION

[0019] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0020] See also Figure 1 The present invention provides a low-noise bearing, which is mainly composed of a bearing outer ring 1, a bearing inner ring 2, a bearing intermediate ring 4, a ball retainer 3 and balls 5.

[0021] The outer ring 1 of the bearing is arranged on the periphery of the inner ring 2 of the bearing, the intermediate ring 4 of the bearing is arranged between the outer ring 1 of the bearing and the inner ring 2 of the bearing, and a common ball retainer 3 is arranged in the space between the intermediate ring 4 of the bearing and the outer ring 1 of the bearing and the space between the intermediate ring 4 of the bearing and the inner ring 2 of the bearing, and the balls 5 are arranged in the ball retainer 3. One ball retainer 3 is composed of two rows of balls 5, inner and outer.

[0022] When the low-noise bearing of the present invention is used, the outer ring 1 of the bearing is fixed, and the inner ring 2 of the bearing is connected to the motor shaft and rotates, thereby reducing the rotation speed of the bearing balls 5 and thus reducing the bearing noise.

[0023] For ordinary bearings, there is only one row of balls in the ring, so the angular velocity of the balls is equal to the ratio of the tangential velocity of the inner ring to the diameter of the balls.

[0024] Since the low-noise bearing of the present invention is provided with an additional row of balls and a bearing intermediate ring, the rotational angular velocity of the inner row of balls is equal to the ratio of the difference between the tangential velocity of the inner ring of the bearing and the tangential velocity of the bearing intermediate ring to the diameter of the balls; the angular velocity of the outer row of balls is equal to the ratio of the tangential velocity of the bearing intermediate ring to the diameter of the balls.

[0025] Obviously, the sum of the angular velocities of the inner and outer rows of balls 5 of the low-noise bearing of the present invention is equal to the angular velocity of the balls of the ordinary bearing. In other words, the angular velocity of the balls of the low-noise bearing of the present invention is less than that of the ordinary bearing. Therefore, the noise of the low-noise bearing must be lower than that of the ordinary bearing.

[0026] Since the two rows of balls of the low-noise bearing of the present invention share one ball cage, the ratio of the angular velocity of the balls of the low-noise bearing to the angular velocity of the balls of the ordinary bearing can be further calculated. Since there is only one ball cage, the distance between the balls remains unchanged, so the ratio of the angular velocity of the balls of the inner and outer rows is equal to the ratio of the distance from the center of the ball to the center of the bearing. This ratio is close to 1. That is to say, the angular velocity of the balls of the low-noise bearing of the present invention is approximately equal to half of the angular velocity of the balls of the ordinary bearing. This means that the noise of the low-noise bearing is greatly reduced.

[0027] In summary, the low-noise bearing of the present invention uses two rows of balls, three rings and a ball cage to form a bearing, and reduces the bearing noise by reducing the rotation speed of the bearing balls. Compared with ordinary bearings, under the same conditions, the ball rotation speed of the low-noise bearing of the present invention can be reduced by about half, so that the noise of the bearing is greatly reduced, meeting the needs of engineering applications.

[0028] Of course, those skilled in the art should know that the above embodiments are only used to illustrate the present invention. Figure 1 The low noise bearing principle diagram of the present invention is not intended to limit the present invention. Within the technical scope of using two or more rows of balls and three or more bearing rings and using two or more ball retainers, the above embodiments and Figure 1 All modifications and variations will fall within the scope of the claims of the present invention.

Claims

1. A low noise bearing, characterized in that: It comprises a bearing outer ring (1), a bearing inner ring (2), a bearing intermediate ring (4), a ball retainer (3) and balls (5); The bearing outer ring (1) is arranged on the periphery of the bearing inner ring (2); a bearing intermediate ring (4) is arranged between the bearing outer ring (1) and the bearing inner ring (2); a common ball retainer (3) is arranged in the space between the bearing intermediate ring (4) and the bearing outer ring (1) and in the space between the bearing intermediate ring (4) and the bearing inner ring (2); balls (5) are arranged in the ball retainer (3); and one ball retainer (3) is composed of inner and outer rows of balls (5); The outer ring (1) of the bearing is fixed, and the inner ring (2) of the bearing is connected to the motor shaft and rotates, thereby reducing the rotation speed of the bearing balls (5) and thus reducing the bearing noise; The sum of the angular velocities of the inner and outer rows of balls (5) is equal to the angular velocity of ordinary bearing balls; The rotational angular velocity of the inner row of balls is equal to the ratio of the difference between the tangential velocity of the inner ring of the bearing and the tangential velocity of the middle ring of the bearing to the diameter of the balls; The angular velocity of the outer row of balls is equal to the ratio of the tangential velocity of the bearing intermediate ring to the diameter of the balls; The ratio of the angular velocities of the inner and outer rows of balls is equal to the ratio of the distances from the center of the ball to the center of the bearing; The low-noise bearing uses two rows of balls, three rings and a ball cage to form a bearing, and reduces the bearing noise by reducing the rotation speed of the bearing balls. Since there is only one ball cage, the distance between each ball remains unchanged, so the ratio of the angular velocities of the inner and outer rows of balls is equal to the ratio of the distances from the center of the ball to the center of the bearing, thereby greatly reducing the noise of the low-noise bearing.

Images