A bearing cage for a tool shank

Abstract

This application discloses a bearing retainer for tool holders, including a frame body. The frame body has a hollow frustum structure so that the sides of the frame body are inclined. The sides of the frame body have three assembly layers, and each assembly layer has multiple windows for accommodating rollers. The windows of adjacent assembly layers are staggered. When the inclined frame body of this invention rotates, it will tightly press the rollers together. This process reduces the relative displacement between components, suppresses vibration and noise caused by loosening, and improves the stability of the bearing under dynamic loads.

Description

Technical Field

[0001] This utility model belongs to the field of bearing technology, specifically relating to a bearing cage for a tool holder. Background Technology

[0002] Bearings are common components in the mechanical field. Their structure includes an outer ring, an inner ring, rolling elements in between, and a bearing cage to restrict and guide the rolling elements. Bearings have a wide range of applications and can be used in a variety of different scenarios. However, the working environment of each application scenario is different, and the requirements for physical conditions such as strength and stability are different. Therefore, the structure of the bearing is adjusted for different scenarios. The most common adjustment and improvement is to adjust and improve the structure of the bearing cage to give the bearing different performance to meet the application requirements.

[0003] When bearings are used to fix machine tool holders, the load on the bearing cage is extremely high because the machine tool rotates at high speed. In addition, this application scenario also has great requirements for rotational stability. Conventional bearing cages cannot meet the requirements, so a bearing cage that meets the needs of this scenario needs to be proposed. Summary of the Invention

[0004] To address the aforementioned problems, this utility model provides a bearing cage for tool holders. This cage utilizes a three-layer assembly structure to enhance the stability of bearing rotation. Simultaneously, the inclined cage body allows the rollers to engage with the cage body, enabling the cage body to guide and compress the rollers. This not only results in a more uniform load distribution within the bearing but also reduces relative displacement between different parts, thereby improving stability.

[0005] The specific solution is as follows: a bearing retainer for a tool holder includes a frame body, the frame body is a hollow frustum structure so that the side of the frame body is inclined, and the side of the frame body has three assembly layers, each assembly layer has multiple windows for accommodating rollers, and the windows of adjacent assembly layers are staggered.

[0006] Furthermore, the slope of the frame side is 2°-4°, and the inclined setting of the frame will guide and press the rollers during rotation.

[0007] Furthermore, the assembly layer also includes a support section, which is located on both sides of the window in the circumferential direction of the frame. The windows are evenly distributed in the assembly layer, and the center line of the support section corresponds to the center line of the window in the adjacent assembly layer.

[0008] The support section is used to ensure the strength of the frame. The uniform distribution of windows will make the load on the support section uniform when the roller rolls, avoiding stress concentration. The support section and the windows of the adjacent assembly layer correspond to each other, which will increase the support force of the windows of the adjacent layer, improve the load-bearing strength of the windows, make the connecting rings at the windows less prone to deformation, and extend the service life of the frame.

[0009] Furthermore, the length of the support part along the circumferential direction of the frame is not less than 1 / 2 of the length of the window in that direction.

[0010] Furthermore, the assembly layer also includes connecting rings for connecting with the support, the connecting rings being located on both sides of the window in the axial direction of the frame, and the length of the connecting rings in the axial direction of the frame being not less than 1 / 4 of the length of the window in that direction.

[0011] Both the support and the connecting ring are components of the frame around the window. If the support and the connecting ring are too thin, they will not be able to withstand the load of the rollers running for a long time, which will cause deformation and damage to the bearing.

[0012] Furthermore, the window is equipped with two rollers, which are arranged side by side along the axial direction of the frame, and the side edge of the window conforms to the surface setting of the rollers.

[0013] Furthermore, the length of the window along the circumference of the frame is greater than the sum of the lengths of the two rollers in that direction, so that there is an oil storage gap between the rollers to allow for the flow of lubricating oil.

[0014] Furthermore, the frame includes a carbon steel body, and the surface of the frame is coated with an anti-corrosion coating. The coating can be enhanced using surface treatment technology, preferably an electroplating coating, an anti-oxidation coating, etc., and can be adjusted according to the needs of the specific use environment.

[0015] Since cutting fluid is present inside the machine tool, some cutting fluid will volatilize certain chemical gases at high temperatures. If these gases come into contact with the bearing, they may cause corrosion to the surface of the cage, thereby shortening the service life of the cage. Therefore, an anti-corrosion coating is set to reduce the impact of cutting fluid on the cage. The type of coating can be selected according to the commonly used cutting fluid. Preferably, multiple coatings corresponding to different cutting fluids can be applied in multiple layers to increase the applicability to cutting fluids.

[0016] Alternatively, the frame can be an injection-molded body without a coating on its surface; the injection-molded body is preferably made of a highly wear-resistant material.

[0017] Furthermore, the preferred number of windows in each assembly layer is between 18 and 22.

[0018] The beneficial effects of this utility model are as follows:

[0019] 1. This utility model features a three-layer roller assembly structure, which distributes the load between the rollers. At the same time, when a roller bears a large load in a certain area, the inclined frame will guide the roller to the area with a smaller load, thus optimizing the overall load distribution.

[0020] 2. This utility model features an inclined frame, which guides the rollers to always move along the theoretical center line of the raceway when the frame rotates, thus avoiding edge stress concentration or jamming caused by roller skew or misalignment, and improving the smoothness of movement.

[0021] 3. The inclined frame of this utility model will tightly press the rollers when rotating. This process reduces the relative displacement between components, suppresses vibration and noise caused by loosening, and improves the stability of the bearing under dynamic load. Attached Figure Description

[0022] The accompanying drawings, which are provided to further illustrate this application and form part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute an undue limitation of this application.

[0023] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0024] Figure 2 This is a schematic diagram of the assembly state structure of an embodiment of the present utility model;

[0025] In the attached drawings: 1-frame, 11-assembly layer, 111-window, 112-support, 113-connecting ring, 2-roller, 21-oil storage gap. Detailed Implementation

[0026] To more clearly illustrate the overall concept of this application, a detailed explanation is provided below with reference to the accompanying drawings.

[0027] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0028] Furthermore, it should be understood in the description of this application that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0029] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0030] In this application, unless otherwise expressly specified and limited, the "above" or "below" of the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. In the description of this specification, references to terms such as "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples.

[0031] Example 1

[0032] In this embodiment, as Figure 1-2 A bearing retainer for a tool holder includes a frame body 1. The frame body 1 has a hollow frustum structure so that the side of the frame body 1 is inclined. The side of the frame body 1 has three assembly layers 11. The assembly layers 11 have multiple windows 111 for accommodating rollers 2. The windows 111 of adjacent assembly layers 11 are staggered.

[0033] Furthermore, the slope of the side of the frame 1 is 3°. The inclined setting of the frame 1 will guide and press the roller 2 during rotation.

[0034] The inclined frame 1 causes the window 111 of the fixed roller 2 to also be inclined. The inclined window 111 forms a certain angle with the inner and outer raceways. When the cage rotates with the shaft, the inclined structure guides the roller 2 to always move in line with the theoretical center line of the raceway, avoiding edge stress concentration or jamming caused by the roller 2 being skewed or misaligned. Especially under high speed or medium impact load, this guiding function can reduce the collision between the roller 2 and the edge of the raceway and improve the smoothness of movement.

[0035] The tilt angle will automatically adjust the contact position of roller 2 under radial load, and force roller 2 to evenly distribute the load through geometric constraints, avoiding local overload; when roller 2 bears a large load in a certain area, the tilted frame 1 will push roller 2 to the area with a smaller load through the guiding effect, optimize the overall load distribution, and extend the service life.

[0036] At the same time, when the frame 1 is tilted, a small axial force will be generated between it and the inner and outer rings or adjacent rollers 2, forming a preload effect. This preload effect can eliminate the axial clearance inside the bearing and improve the axial stiffness of the bearing, which is especially suitable for scenarios such as machine tool spindles that require high rigidity support.

[0037] The inclined design changes the contact surface between the frame 1 and the roller 2 from pure radial contact to angled inclined contact. According to Hertz contact theory, this contact form can reduce the peak contact stress, and at the same time enhance the friction between the needle and the cage through clamping force, thus preventing the roller 2 from slipping when rotating at high speed.

[0038] The tight clamping fit reduces the relative displacement between components, suppresses vibration and noise caused by loosening, and improves the stability of the bearing under dynamic loads.

[0039] Furthermore, the assembly layer 11 also includes a support portion 112, which is located on both sides of the window 111 in the circumferential direction based on the frame 1. The windows 111 are evenly distributed in the assembly layer 11, and the center line of the support portion 112 corresponds to the center line of the window 111 of the adjacent assembly layer 11.

[0040] The support part 112 is used to ensure the strength of the frame 1. The even distribution of windows 111 will make the load on the support part 112 uniform when the roller 2 rolls, avoiding stress concentration. The support part 112 and the windows 111 of the adjacent assembly layer 11 will increase the support force of the adjacent layer windows 111, improve the load-bearing strength of the windows 111, make the connecting ring 113 at the window 111 less prone to deformation, and extend the service life of the frame 1.

[0041] Furthermore, the length of the support 112 along the circumferential direction of the frame 1 is half the length of the window 111 in that direction.

[0042] Furthermore, the assembly layer 11 also includes a connecting ring 113 for connecting with the support 112. The connecting ring 113 is located on both sides of the window 111 in the axial direction of the frame 1, and the length of the connecting ring 113 in the axial direction of the frame 1 is 1 / 4 of the length of the window 111 in that direction.

[0043] The support part 112 and the connecting ring 113 are both components of the frame around the window 111. If the support part 112 and the connecting ring 113 are too thin, they will not be able to withstand the load of the roller 2 running for a long time, resulting in deformation and damage to the bearing.

[0044] Furthermore, the window 111 is provided with two rollers 2, the rollers 2 having a diameter of 3mm*9.7mm. The two rollers 2 are arranged side by side along the axial direction of the frame 1, and the side edge of the window 111 conforms to the surface setting of the rollers 2.

[0045] Furthermore, the length of the window 111 along the circumference of the frame 1 is greater than the sum of the lengths of the two rollers 2 in that direction, so that there is an oil storage gap 21 between the rollers 2 for the flow of lubricating oil.

[0046] Furthermore, the frame 1 includes a carbon steel body, and the surface of the frame 1 is coated with an anti-corrosion coating, preferably a paint coating, an anti-oxidation coating, etc., which can be adjusted according to the needs of the specific use environment.

[0047] Since cutting fluid is present inside the machine tool, some cutting fluid will volatilize certain chemical gases at high temperatures. If these gases come into contact with the bearing, they may cause corrosion to the surface of the cage, thereby shortening the service life of the cage. Therefore, an anti-corrosion coating is set to reduce the impact of cutting fluid on the cage. The type of coating can be selected according to the commonly used cutting fluid. Preferably, multiple coatings corresponding to different cutting fluids can be applied in multiple layers to increase the applicability to cutting fluids.

[0048] Furthermore, each assembly layer 11 has 20 windows 111.

[0049] Example 2

[0050] The difference between this embodiment and Embodiment 1 is that:

[0051] The length of the support 112 along the circumferential direction of the frame 1 is 2 / 3 of the length of the window 111 in that direction; the length of the connecting ring 113 along the axial direction of the frame 1 is 1 / 3 of the length of the window 111 in that direction; the wider support 112 and connecting ring 113 will enhance the load strength of the window 111, while also slightly increasing the weight of the cage and the production materials.

[0052] The frame 1 can be an injection-molded body, and the surface of the injection-molded body is not coated; the injection-molded body is made of a highly wear-resistant material.

[0053] For any parts not mentioned in this application, existing technologies may be used or referenced.

[0054] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0055] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A bearing retainer for a tool holder, characterized in that, The device includes a frame, which has a hollow frustum structure so that the sides of the frame are inclined. The sides of the frame have three assembly layers, and each assembly layer has multiple windows for accommodating rollers. The windows of adjacent assembly layers are staggered.

2. A bearing retainer for a tool holder according to claim 1, characterized in that, The slope of the side of the frame is 2°-4°.

3. A bearing retainer for a tool holder according to claim 1, characterized in that, The assembly layer also includes a support portion located on both sides of the window in the circumferential direction of the frame. The windows are evenly distributed in the assembly layer, and the centerline of the support portion corresponds to the centerline of the window in the adjacent assembly layer.

4. A bearing retainer for a tool holder according to claim 3, characterized in that, The length of the support portion along the circumferential direction of the frame is not less than 1 / 2 of the length of the window in that direction.

5. A bearing retainer for a tool holder according to claim 3, characterized in that, The assembly layer also includes connecting rings for connecting with the support, the connecting rings being located on both sides of the window based on the axial direction of the frame, and the length of the connecting rings along the axial direction of the frame being not less than 1 / 4 of the length of the window in that direction.

6. A bearing retainer for a tool holder according to claim 1, characterized in that, The window contains two rollers, which are arranged side by side along the axial direction of the frame, and the side edge of the window conforms to the surface of the rollers.

7. A bearing retainer for a tool holder according to claim 6, characterized in that, The length of the window along the circumference of the frame is greater than the sum of the lengths of the two rollers in that direction, so that there is an oil storage gap between the rollers to allow lubricating oil to flow.

8. A bearing retainer for a tool holder according to claim 1, characterized in that, The frame consists of a carbon steel body, and the surface of the frame is coated with an anti-corrosion coating.

9. A bearing retainer for a tool holder according to claim 1, characterized in that, Each assembly layer has 18-22 windows.

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