High-speed electric spindle ceramic bearing positioning structure

Abstract

The utility model discloses a high -speed electricity main shaft ceramic bearing positioning structure, including axle core, bearing and shell, the outer wall both sides of axle core are installed with bearing, the outside of bearing is provided with shell, the both sides outer wall of shell is provided with the thread layer symmetrically, the outer wall thread joint of thread layer has the screw block, the inside rotation of screw block is connected with sleeve top rod, just the inside of sleeve top rod is combined with thread layer, the outer wall of shell is provided with positioning assembly equidistantly, the outside of positioning assembly all is provided with reset component. The positioning stability is excellent, and the effective guarantee high -speed operation reliability: this structure realizes the axial transmission through the thread cooperation of screw block and thread layer, drives sleeve top rod to push the limit stopper and inserts the bearing outer ring preset recess, simultaneously utilizes the two -sided stopper of limit stopper and forms the bidirectional clamping limit to bearing outer ring, and double positioning structure can limit bearing axial position.

Description

Technical Field

[0001] This utility model relates to the field of positioning technology for ceramic bearings of electric spindles, specifically a positioning structure for ceramic bearings of high-speed electric spindles. Background Technology

[0002] As the core power component of precision machining equipment, the high-speed electric spindle's operating accuracy, stability, and reliability directly determine the quality and efficiency of the machined workpiece. Ceramic bearings, with their advantages of low density, high hardness, excellent wear resistance, and high temperature resistance, are widely used in high-speed electric spindles, becoming a key core component to ensure the high-speed and high-precision operation of the electric spindle.

[0003] During the assembly and operation of high-speed electric spindles, the axial positioning accuracy of ceramic bearings is crucial. If the bearing positioning is unstable, axial movement is likely to occur under high-speed rotation conditions. This will not only accelerate bearing wear and reduce its service life, but also seriously affect the rotational accuracy of the electric spindle, leading to increased machining errors and even causing equipment vibration, noise, and other malfunctions, thereby affecting the stability and safety of the entire machining system.

[0004] Currently, the positioning structures of existing high-speed electric spindle ceramic bearings mostly adopt methods such as nut clamping, elastic retaining ring snap-fit, or pin positioning. Among them, the nut clamping positioning structure can provide a certain positioning pressure, but under high-speed rotation conditions, the nut is prone to loosening due to vibration, resulting in positioning failure. Moreover, its adjustment process is cumbersome and it is difficult to achieve precise positioning. The elastic retaining ring snap-fit ​​positioning structure is relatively convenient to disassemble and assemble, but the load-bearing capacity of the retaining ring is limited, and it is prone to deformation or breakage under high-speed and heavy-load conditions, which cannot meet the positioning requirements of high reliability. The pin positioning structure has problems such as low positioning accuracy and greater damage to the outer ring of the bearing. In addition, the positioning hole needs to be repeatedly aligned during disassembly and assembly, which is inconvenient and inefficient. Utility Model Content

[0005] The purpose of this invention is to provide a positioning structure for a ceramic bearing of a high-speed electric spindle to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a high-speed electric spindle ceramic bearing positioning structure, comprising a spindle core, bearings, and a housing. Bearings are installed on both sides of the outer wall of the spindle core, and a housing is provided outside the bearings. Threaded layers are symmetrically arranged on both sides of the outer wall of the housing. Threaded blocks are threadedly connected to the outer wall of the threaded layers. A sleeve push rod is rotatably connected inside the threaded blocks, and the inside of the sleeve push rod is in contact with the threaded layers. Positioning components are equidistantly arranged on the outer wall of the housing, and reset components are provided on the outer side of each positioning component.

[0007] Preferably, both the threaded layer and the outer wall of the outer shell are provided with through grooves for positioning the insertion of the components.

[0008] Preferably, the threaded block has a groove inside, and the inside of the groove is connected to the sleeve push rod through a slider.

[0009] Preferably, the positioning component includes a limiting block, which is inserted into the through groove formed between the threaded layer and the outer shell, and the portion of the limiting block that penetrates the outer shell has stops fixed on both sides.

[0010] Preferably, the spacing of the stops matches the cross-section of the bearing.

[0011] Preferably, the reset assembly includes a connecting post, which is fixedly connected to the outside of the limiting block. A spring is fixedly connected to the inside of the connecting post, and the end of the spring away from the connecting post is connected to the outer shell. Limiting rings are symmetrically fixed on both sides of the outer wall of the outer shell.

[0012] Preferably, the outer ring surface of the bearing has a groove that matches the limiting pressure block, which is used to position the bearing after the limiting pressure block is inserted.

[0013] Compared with the prior art, the beneficial effects of this utility model are: Excellent positioning stability, effectively ensuring high-speed operation reliability: This structure achieves axial transmission through the threaded engagement of the threaded block and the threaded layer, driving the sleeve push rod to push the limiting pressure block into the preset groove of the bearing outer ring. At the same time, the stop blocks on both sides of the limiting pressure block form a bidirectional clamping and limiting of the bearing outer ring. The dual positioning structure can limit the axial position of the bearing, completely avoiding axial movement of the bearing during high-speed rotation, improving the stability and safety of high-speed electric spindle operation, and solving the technical pain point of existing positioning structures being prone to positioning failure due to high-speed vibration.

[0014] Easy to operate, reducing the difficulty of disassembly and maintenance: On the one hand, the feeding and positioning of the positioning component can be completed by rotating the threaded block. The operation is simple and intuitive, without the need for complicated tools. On the other hand, the spring structure of the reset component can realize the automatic reset of the positioning component. When it is necessary to disassemble or adjust the bearing, simply rotate the threaded block in the opposite direction. The elastic reset force of the spring can push the limit block out of the bearing groove. Compared with the traditional cumbersome disassembly structure such as bolt fastening and pin positioning, it greatly shortens the disassembly and assembly time, reduces the operation intensity of maintenance personnel, and improves the efficiency of equipment operation and maintenance.

[0015] The structure is reasonably designed and has protective functions: the symmetrically arranged limiting rings on both sides of the outer shell can limit the axial movement range of the threaded block. This can prevent the threaded block from moving excessively and detaching from the thread layer, and also prevent the sleeve push rod from excessively squeezing the positioning component and bearing. This effectively avoids component damage caused by improper operation or overfeeding, extends the service life of core components such as bearings and positioning components, and reduces equipment operating costs. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 for Figure 1 Detailed view of the connection structure in cross-section; Figure 3 for Figure 2 Enlarged detail of the connection structure of the reset component; Figure 4 for Figure 2 Detailed view of the connection structure in a side cross-section.

[0017] Explanation of reference numerals in the attached drawings: 1. Shaft core, 2. Bearing, 3. Housing, 4. Threaded layer, 5. Threaded block, 6. Sleeve top rod, 7. Limiting pressure block, 8. Stop block, 9. Connecting column, 10. Spring, 11. Limiting ring. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figure 1-4This utility model provides a technical solution for a high-speed electric spindle ceramic bearing positioning structure: A high-speed electric spindle ceramic bearing positioning structure includes a spindle core 1, bearings 2, and a housing 3. Bearings 2 are installed on both sides of the outer wall of the spindle core 1. The spindle core 1 serves as the core load-bearing component and power transmission carrier of the entire positioning structure. The bearings 2 serve as the core support component for high-speed rotation. The housing 3 is provided outside the bearings 2, serving as the external protection and mounting carrier of the entire positioning structure. Threaded layers 4 are symmetrically arranged on both sides of the outer wall of the housing 3. The threaded layers 4 serve as the moving guide and transmission structure for threaded blocks 5. Threaded blocks 5 are threadedly connected to the outer wall of the threaded layers 4. The threaded blocks 5 serve as positioning and transmission execution components, acting through the threads of the threaded layers 4. In conjunction with the threaded block 5, rotating it allows it to move axially along the outer shell 3, thereby pushing the sleeve push rod 6 to act on the positioning assembly. The sleeve push rod 6 is rotatably connected inside the threaded block 5, and the inside of the sleeve push rod 6 is in contact with the threaded layer 4. The sleeve push rod 6, as a positioning force transmission component, transmits the axial thrust of the threaded block 5 to the limiting pressure block 7. The lateral movement force is converted into a downward movement force through the inclined side of the limiting pressure block 7. Positioning assemblies are equidistantly arranged on the outer wall of the outer shell 3, and reset assemblies are arranged on the outer side of each positioning assembly. Through slots are opened on both the threaded layer 4 and the outer wall of the outer shell 3 for the insertion of the positioning assemblies. A sliding groove is opened inside the threaded block 5, and the inside of the sliding groove is connected to the sleeve push rod 6 through a slider.

[0020] The positioning component includes a limiting block 7, which is inserted into the through slot between the threaded layer 4 and the outer shell 3. As the core actuator of the positioning component, the limiting block 7 contacts its inclined side through the sleeve push rod 6 and is inserted into the interior of the outer shell 3. Then it is inserted into the groove of the outer ring of the bearing 2 to achieve axial positioning of the bearing 2 and prevent the bearing 2 from axially moving when rotating at high speed. The limiting block 7 has stops 8 fixed on both sides of the part that penetrates the outer shell 3. The stops 8 assist the limiting block 7 in achieving positioning. The distance between the two stops 8 limits the axial movement range of the bearing 2, so that the outer ring of the bearing 2 is just stuck between the two stops 8, further improving the stability of the axial positioning of the bearing 2. The distance between the stops 8 matches the cross-section of the bearing 2.

[0021] The reset assembly includes a connecting post 9, which is fixedly connected to the outside of the limiting block 7. The connecting post 9 serves as the connecting carrier between the reset assembly and the limiting block 7, enabling the connection between the spring 10 and the limiting block 7. The spring 10 is fixedly connected to the inner side of the connecting post 9, and the end of the spring 10 away from the connecting post 9 is connected to the outer shell 3. The spring 10 provides reset power for the positioning assembly. When it is necessary to disassemble or adjust the bearing 2, the threaded block 5 is rotated in the opposite direction, and the thrust of the sleeve push rod 6 on the limiting block 7 disappears. At this time, the elastic reset force of the spring 10 is released. The limiting pressure block 7 is pushed outward along the through groove, disengaging from the groove of the outer ring of the bearing 2, thereby resetting the positioning component. Limiting rings 11 are symmetrically fixed on both sides of the outer wall of the housing 3. The limiting rings 11 limit the axial movement range of the threaded block 5, preventing the threaded block 5 from disengaging from the thread layer 4 due to excessive movement when the operator rotates the threaded block 5, or from excessively squeezing the positioning component and bearing 2 by pushing the sleeve push rod 6. The outer ring surface of the bearing 2 has a groove that matches the limiting pressure block 7, which is used to position the bearing 2 after the limiting pressure block 7 is inserted.

[0022] Working Principle: When a high-speed electric spindle ceramic bearing positioning structure is first used, the operator rotates the threaded blocks 5 on the threaded layers 4 on both sides of the housing 3. Utilizing the threaded engagement between the threaded blocks 5 and the threaded layers 4, the threaded blocks 5 move axially inward along the housing, thereby pushing the internally connected sleeve push rod 6 to move axially synchronously. After the sleeve push rod 6 moves, it generates a thrust on the limiting pressure block 7 of the positioning component. The limiting pressure block 7, through its inclined edge, converts the lateral thrust of the sleeve push rod 3 into a moving force towards the inside of the housing 3, inserting inward along the through groove 4 opened between the housing 3 and the threaded layer, and finally embedding into the pre-set matching groove of the outer ring of the bearing 2. Simultaneously, the spacing between the two side stops 8 of the limiting pressure block 7 penetrating the housing 3 matches the bearing cross-section, ensuring that the outer ring of the bearing is precisely locked between the two stops 8, further limiting the axial position of the bearing 2. The limiting ring 11 on the outer wall of the housing 3 restricts the axial movement range of the threaded blocks 5, preventing excessive movement of the threaded blocks 5 from detaching from the threaded layer or excessively squeezing the positioning component and the bearing 2, ensuring positioning stability.

[0023] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A ceramic bearing positioning structure for a high-speed electric spindle, comprising a spindle core (1), bearings (2), and a housing (3), wherein bearings (2) are mounted on both sides of the outer wall of the spindle core (1), and a housing (3) is disposed outside the bearings (2), characterized in that, The outer walls of the outer shell (3) are symmetrically provided with threaded layers (4), and the outer walls of the threaded layers (4) are threadedly connected with threaded blocks (5). The inner walls of the threaded blocks (5) are rotatably connected with sleeve push rods (6), and the inner walls of the sleeve push rods (6) are in contact with the threaded layers (4). The outer walls of the outer shell (3) are provided with positioning components at equal intervals, and the outer sides of the positioning components are provided with reset components.

2. The positioning structure of a high-speed electric spindle ceramic bearing according to claim 1, characterized in that, Both the threaded layer (4) and the outer wall of the outer shell (3) are provided with through grooves for positioning the insertion of components.

3. The positioning structure for a high-speed electric spindle ceramic bearing according to claim 1, characterized in that, The threaded block (5) has a groove inside, and the inside of the groove is connected to the sleeve top rod (6) by a slider.

4. The positioning structure for a high-speed electric spindle ceramic bearing according to claim 1, characterized in that, The positioning component includes a limiting block (7), which is inserted into the through groove between the threaded layer (4) and the outer shell (3). The portion of the limiting block (7) that penetrates the outer shell (3) is fixed with stop blocks (8) on both sides.

5. The positioning structure for a high-speed electric spindle ceramic bearing according to claim 4, characterized in that, The spacing of the stops (8) matches the cross-section of the bearing (2).

6. The positioning structure of a high-speed electric spindle ceramic bearing according to claim 4, characterized in that, The reset assembly includes a connecting post (9), which is fixedly connected to the outside of the limiting block (7). A spring (10) is fixedly connected to the inside of the connecting post (9), and the end of the spring (10) away from the connecting post (9) is connected to the outer shell (3). Limiting rings (11) are symmetrically fixed on both sides of the outer wall of the outer shell (3).

7. The positioning structure for a high-speed electric spindle ceramic bearing according to claim 4, characterized in that, The outer ring surface of the bearing (2) is provided with a groove that matches the limiting pressure block (7) for positioning the bearing (2) after the limiting pressure block (7) is inserted.

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