Solid retainer for high-rotating-speed low-friction main shaft bearing

Abstract

The utility model discloses a solid retainer for a high-rotating-speed low-friction main shaft bearing, which relates to the field of bearings, and adopts the technical scheme that the solid retainer comprises a retainer body provided with a plurality of pockets; inclined locking openings are formed in inner hole openings in the pockets, and the inclined locking openings are distributed corresponding to the two axial sides of the retainer body. The inclined locking opening is formed in the axial side of the retainer, so that the axial movement of the steel balls can be effectively controlled, the displacement of the retainer is more accurately controlled, and the operation stability of the bearing is improved.

Description

Technical Field

[0001] The utility model relates to the field of bearings, in particular to a solid cage for a high-speed and low-friction spindle bearing. Background Technique

[0002] As a key component of the spindle, the performance of the bearing will directly affect parameters such as the rotational accuracy, speed, rigidity, temperature rise and noise of the spindle, and further affect the working quality of the spindle. Therefore, in order to maintain excellent spindle working ability, high-performance bearings must be used.

[0003] The bearing cage, also known as the bearing retainer, is one of the main parts of the bearing. The main functions of the cage in the bearing are: evenly distributing the rolling elements along the raceway, reducing friction, preventing the rolling elements from falling off and guiding the normal movement of the rolling elements.

[0004] Generally, a nylon cage is used for ball-guided angular contact bearings, which adopts a cylindrical straight pocket hole and a point-contact type inclined locking mouth form, and the locking mouth controls the radial movement of the cage (as Figure 3 shown); the solid cage adopts a cylindrical straight pocket hole structure. When the bearing rotates, the rolling elements (steel balls) contact the cylindrical surface of the straight pocket hole. The clearance between the cage and the steel balls in the circumferential direction is determined by the diameter of the straight pocket hole of the cage. If the pocket hole diameter is large, the cage will run unstably; if the pocket hole diameter is small, the lubricating film on the surface of the steel ball is easily damaged.

[0005] When the cage structure is guided by the inner and outer rings of the bearing, the cage will contact the inner and outer rings of the bearing more frequently and excessively, and excessive friction is inevitable. When the cage structure is ball-guided, the cage will contact the rolling elements more frequently and excessively, and excessive friction is inevitable. Therefore, it is necessary to leave a certain clearance between the cage and the rolling elements, and attention should be paid to the guide surface clearance between the cages, which will also seriously affect the stability of the cage. Due to the frequent collision between the cage and the balls during the operation of the bearing, the cage will be damaged and the phenomenon of "cage instability" will occur. Content of the Utility Model

[0006] To solve the above technical problems, the utility model provides a solid cage for a high-speed and low-friction spindle bearing. By setting an inclined locking mouth on the axial side of the cage, the axial movement of the steel balls can be effectively controlled, the displacement of the cage can be more accurately controlled, and the running stability of the bearing can be improved.

[0007] The technical solution adopted by the utility model to solve its technical problems is: a solid cage for a high-speed and low-friction spindle bearing, including a cage body provided with a plurality of pocket holes;

[0008] An inclined locking mouth is arranged at the inner hole opening in the pocket hole, and the inclined locking mouths are distributed corresponding to the two axial sides of the cage body.

[0009] In this solution, the inclined locking mouths are arranged on both axial sides of the cage body corresponding to the inclined locking mouths, which can limit the axial movement of the steel balls on the axial side of the cage, achieve axial ball locking. Compared with the traditional structure, the amount of ball movement in the radial direction is reduced by half. From the perspective of the bearing, the displacement of the cage can be more accurately controlled, and the running stability of the bearing can be improved. When the rolling elements rotate on the center diameter, the clearance of the cage in the circumferential direction becomes smaller, and the movement is also correspondingly reduced, so that the cage runs stably, the lubricating film on the surface of the rolling elements is not easily damaged, reliable lubrication of the bearing is ensured, thereby reducing the bearing noise and extending the service life of the bearing. It is more in line with the application conditions of the spindle bearing with low noise and vibration.

[0010] Preferably, the inclined locking mouth is in surface contact with the steel ball surface. The axial dimension of the pocket of the cage is reduced, and the locking mouth of the cage is in surface contact form, that is, the contact form between the rolling element and the inclined locking mouth of the cage is surface contact. When friction occurs between the cage and the rolling element, the influence on the cage is smaller.

[0011] Preferably, the pocket is a straight pocket.

[0012] Preferably, the cage body is made of brass material. It is not affected by common bearing lubricants, including synthetic oils and synthetic greases, which enables it to maintain good performance in various working environments. Specifically, it is reflected in the roundness and ellipticity of the pocket diameter to control the movement of the rolling elements. The mechanical strength of the brass cage is equivalent to that of the steel plate stamping cage, but the density is relatively small, which means that under the same strength, the weight of the brass cage is lighter, which is beneficial to reducing the weight of the entire bearing, improving the flexibility and service efficiency of the bearing. At the same time, the brass cage has a high limiting speed and is suitable for high-speed rotation application scenarios. It is more in line with the application conditions of the spindle bearing with high speed.

[0013] Preferably, a groove capable of accommodating grease is arranged inside the beam between adjacent pockets. The groove can play a role in collecting grease, and through it, the grease flows to the steel balls installed in the pockets of the cage, and the rolling of the steel balls replenishes the grease to the working area of the bearing. Due to sufficient lubrication, the noise of the bearing during rotation is greatly reduced.

[0014] Preferably, a chamfer structure is arranged along the inner end of the cage. The chamfer structure can reduce the weight of the cage, which is beneficial to reducing the weight of the entire bearing, improving the flexibility of the bearing cage and the high-speed performance of the bearing. At the same time, the wall thickness at both ends of the cage is uniform, which is beneficial to the uniformity of the cage deformation.

[0015] The beneficial effects of the present utility model:

[0016] In this solution, by setting inclined locking openings on the axial side of the cage, the axial movement of the steel balls can be effectively controlled. From the perspective of the bearing, the displacement of the cage can be more precisely controlled, improving the running stability of the bearing. It can effectively prevent the problems of running stability (noise and vibration) caused by frequent contact and friction between the cage and excessive rolling elements during operation. The design of the groove structure can collect lubricating grease and play a role in reducing noise. By chamfering the inner end edge of the cage, the weight of the cage can be reduced, improving the flexibility of the bearing cage and the high-speed performance of the bearing. At the same time, the wall thickness at both ends of the cage is uniform, which is beneficial to the uniformity of cage deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only 3 of the drawings of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 It is a schematic diagram of an embodiment of the present invention;

[0019] Figure 2 It is a detailed view of the cooperation between the pocket and the steel ball in an embodiment of the present invention;

[0020] Figure 3 It is a schematic diagram of radial ball locking in the prior art of an embodiment of the present invention;

[0021] Among them, 1. Cage body; 2. Pocket; 3. Inclined locking opening; 4. Groove; 5. Steel ball. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] In order to deepen the understanding of the present invention, the following will further describe the present invention in detail with reference to the drawings and embodiments. The embodiments are only used to explain the present invention and do not limit the protection scope of the present invention.

[0023] Embodiment

[0024] As Figure 1 shown, a solid cage for a high-speed and low-friction spindle bearing includes a cage body 1 provided with a plurality of pockets 2;

[0025] An inclined locking opening 3 is provided at the inner hole opening in the pocket 2, and the inclined locking openings 3 are distributed corresponding to both axial sides of the cage body 1.

[0026] In this solution, the inclined locking openings 3 are arranged on both axial sides of the cage body 1, which can limit the axial movement of the steel balls 5 on the axial side of the cage, achieving axial ball locking. Compared with the traditional structure, the ball movement amount in radial ball locking is reduced by half. From the perspective of the bearing, the displacement of the cage can be more accurately controlled, improving the running stability of the bearing. When the rolling elements rotate on the center diameter, the clearance of the cage in the circumferential direction becomes smaller, and the movement also decreases accordingly, making the cage run stably, preventing the lubricating film on the surface of the rolling elements from being easily damaged, ensuring reliable lubrication of the bearing, thereby reducing bearing noise and extending the service life of the bearing. It is more suitable for the application conditions of spindle bearings with low noise and vibration.

[0027] Combined with Figure 2 As shown, the inclined locking openings 3 are in surface contact with the steel balls 5. Among them, the pocket holes 2 are straight pocket holes, reducing the axial dimension of the cage pocket holes 2, making the cage locking opening in a surface contact form, that is, the contact form between the rolling elements and the inclined locking openings 3 of the cage is surface contact. When friction occurs between the cage and the rolling elements, the impact on the cage is smaller. The cage body 1 is made of brass material. It is not affected by common bearing lubricants, including synthetic oils and synthetic greases, which enables it to maintain good performance in various working environments. Specifically, it controls the movement amount of the rolling elements through the roundness and ovality of the diameter of the pocket holes 2. The mechanical strength of the brass cage is equivalent to that of the steel plate stamping cage, but the density is relatively small, which means that under the same strength, the weight of the brass cage is lighter, which is beneficial to reducing the weight of the entire bearing, improving the flexibility and service efficiency of the bearing. At the same time, the brass cage has a high limiting speed and is suitable for high-speed rotation application scenarios. It is more suitable for the application conditions of spindle bearings with high rotational speeds. Here, the material of the cage body 1 is actually not limited to brass, and nylon material can also be used, but the brass material has better effects in this embodiment.

[0028] Grooves 4 for accommodating grease are arranged inside the beams between adjacent pocket holes 2. The grooves 4 can collect grease and make the grease flow to the steel balls 5 installed in the cage pocket holes 2 through it. The rolling of the steel balls 5 replenishes the grease to the working area of the bearing. Due to sufficient lubrication, the noise of the bearing during rotation is greatly reduced.

[0029] A chamfer structure is arranged along the inner end of the cage. The chamfer structure can reduce the weight of the cage, which is beneficial to reducing the weight of the entire bearing, improving the flexibility of the bearing cage and the high-speed performance of the bearing. At the same time, the wall thickness at both ends of the cage is uniform, which is beneficial to the uniformity of the cage deformation.

[0030] The beneficial effects of the present utility model:

[0031] In this solution, by setting an inclined locking notch 3 on the axial side of the cage, the axial movement of the steel balls 5 can be effectively controlled. From the perspective of the bearing, the displacement of the cage can be more accurately controlled, improving the running stability of the bearing. It can effectively prevent the problems of running stability (noise and vibration) caused by frequent contact and friction between the cage and the rolling elements during operation. The design of the groove 4 structure can collect grease and play a role in reducing noise. By chamfering the inner end edge of the cage, the weight of the cage can be reduced, improving the flexibility of the bearing cage and the high-speed performance of the bearing. At the same time, the wall thickness at both ends of the cage is uniform, which is beneficial to the uniformity of cage deformation.

[0032] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0033] The above-described embodiments merely represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A solid retainer for a high-speed, low-friction spindle bearing, characterized in that: It comprises a retainer body (1) provided with a plurality of pockets (2); The inner opening of the pocket hole (2) is provided with an oblique locking opening (3), and the oblique locking opening (3) is distributed on both axial sides of the retaining frame body (1).

2. A solid retainer for a high-speed, low-friction spindle bearing according to claim 1, characterized in that: The oblique locking opening (3) is in surface contact with the steel ball (5).

3. The solid retainer for a high-speed, low-friction spindle bearing according to claim 1, characterized in that: The pocket hole (2) is a straight pocket hole (2).

4. The solid retainer for a high-speed, low-friction spindle bearing according to claim 1, characterized in that: The retainer body (1) is made of brass material.

5. The solid retainer for a high-speed, low-friction spindle bearing according to claim 1, characterized in that: A groove (4) capable of accommodating lubricating grease is arranged inside the beam between adjacent pockets (2).

6. The solid retainer for a high-speed, low-friction spindle bearing according to claim 1, characterized in that: The inner end edge of the retaining frame is provided with a chamfer structure.

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