A riveting structure of a dynamic pressure bearing and a shaft sleeve
By setting a riveting structure with venting grooves and flow guide grooves between the hydrodynamic bearing and the bushing, the problem of gas retention during laser motor assembly is solved, achieving higher assembly accuracy and lower noise and vibration, thus improving the overall performance of the laser motor.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHUHAI NUOWEIDA MOTOR CO LTD
- Filing Date
- 2025-10-09
- Publication Date
- 2026-08-04
AI Technical Summary
During the assembly of the laser motor, the clearance between the hydrodynamic bearing and the bushing makes it difficult to completely expel the trapped gas, resulting in incomplete assembly and affecting the overall performance.
A riveting structure for a hydrodynamic bearing and a bushing is designed. By setting a vent groove on the outer wall of the bearing and a guide groove in the through hole of the shaft, centrifugal force is used to realize gas discharge and fluid lubrication, ensuring that the bearing is fully assembled and storing excess lubricating oil to prevent overflow when the bearing stops rotating.
This improves the assembly precision of the laser motor, reduces noise and vibration, and enhances overall performance and service life.
Smart Images
Figure CN224592561U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of laser motor assembly technology, and in particular to a riveting structure for a hydrodynamic bearing and a bushing. Background Technology
[0002] FDB bearings (Fluid Dynamic Bearing) are an advanced bearing technology that utilizes a fluid oil film to support the shaft core. Their core principle is based on the hydrodynamic effect generated when the shaft core rotates, which creates a stable, high-pressure oil film in the bearing clearance, thereby preventing direct contact and friction between metal components. This design not only significantly reduces operating noise but also greatly reduces mechanical wear, extends bearing life, and improves the stability and precision of equipment under high-speed operation.
[0003] In precision equipment such as laser motors, the high stability and low vibration characteristics of FDB bearings are crucial for ensuring overall performance. However, during actual assembly, especially when pressing the hydrodynamic bearing into the bushing, the internal gas often cannot be quickly expelled due to the extremely small clearance and high sealing performance. This trapped gas generates back pressure, hindering the complete assembly of the hydrodynamic bearing, leading to misalignment or minute installation gaps. Such incomplete assembly can easily degrade the overall performance of the laser motor. Therefore, designers in this field have devised a riveting structure between the hydrodynamic bearing and the bushing. Utility Model Content
[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a riveting structure for a hydrodynamic bearing and a bushing, which facilitates the improvement of the assembly accuracy of the laser motor and thus enhances the overall performance of the laser motor.
[0005] The technical solution of this utility model is as follows: This utility model discloses a riveting structure for a dynamic pressure bearing and a bushing, including a dynamic pressure bearing and a bushing. The dynamic pressure bearing is riveted into the bushing. The bushing is provided with a mounting hole adapted to the dynamic pressure bearing. A shaft through hole is provided axially at the center of the dynamic pressure bearing. At least one set of venting grooves is provided on the outer wall of the dynamic pressure bearing. The venting grooves are arranged parallel to the mounting hole. A plurality of guide grooves are provided on the inner wall of the shaft through hole. The guide grooves are arranged in a V shape. A rotating shaft is inserted into the shaft through hole. Working fluid is stored between the rotating shaft and the dynamic pressure bearing through the guide grooves.
[0006] As can be seen from the above scheme, the vent groove is used to exhaust the dynamic pressure bearing after it is assembled in the bushing. The guide groove is used to store working fluid between the rotating shaft and the dynamic pressure bearing. When the rotating shaft drives the dynamic pressure bearing to rotate, the fluid stored in the guide groove is used to lubricate the rotating shaft due to centrifugal force. When the motor stops, the excess lubricating oil will flow into the oil storage tank for storage to prevent overflow and contamination of other parts. The guide groove is V-shaped. The corresponding points of two adjacent guide grooves in the through hole of the rotating shaft form an effective area, which helps the dynamic pressure bearing support the rotation of the rotating shaft, avoids the rotating shaft and the dynamic pressure bearing from colliding and wearing each other, and thus reduces noise and vibration.
[0007] The bushing includes a first connecting portion and a second connecting portion integrally formed with the first connecting portion. The mounting hole includes a first channel and a second channel communicating with the first channel. The first channel is located inside the first connecting portion, the second channel is located inside the second connecting portion, and the hydrodynamic bearing is located inside the first channel.
[0008] The ventilation slots are arranged in a circumferential array in three groups.
[0009] The guide groove extends along the through hole of the rotating shaft to both ends of the hydrodynamic bearing.
[0010] The working fluid is lubricating oil. Therefore, the working fluid uses lubricating oil to lubricate the rotating shaft. Attached Figure Description
[0011] Figure 1 This is a top view of the present invention; Figure 2 This is a schematic diagram of the structure of a hydrodynamic bearing; Figure 3 This is a schematic diagram of the bushing structure; Figure 4 This is a sectional view of the bushing; Figure 5 This is a cross-sectional view of a hydrodynamic bearing; Figure 6 This is an assembly diagram of a laser motor. Detailed Implementation
[0012] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.
[0013] like Figures 1 to 5As shown, this utility model discloses a riveting structure for a dynamic pressure bearing and a bushing, including a dynamic pressure bearing 1 and a bushing 2. The dynamic pressure bearing 1 is riveted into the bushing 2. The bushing 2 is provided with a mounting hole 3 adapted to the dynamic pressure bearing 1. The center of the dynamic pressure bearing 1 is provided with a shaft through hole 4 along the axial direction. At least one set of vent grooves 5 is provided on the outer wall of the dynamic pressure bearing 1. The vent grooves 5 are arranged in a circumferential array of three sets. The vent grooves 5 are arranged parallel to the mounting hole 3. A plurality of guide grooves 41 are provided on the inner wall of the shaft through hole 4. The guide grooves 41 are arranged in a V shape. A rotating shaft 6 is inserted into the shaft through hole 4. The rotating shaft 6 and the dynamic pressure bearing 1 store working fluid through the guide grooves 41. The working fluid is lubricating oil.
[0014] In one embodiment, the applicable temperature range of the hydrodynamic bearing 1 is -40°C to 150°C, and the working fluid is an ester-based oil. In another embodiment, the applicable temperature range of the hydrodynamic bearing 1 is -50°C to 250°C, and the working fluid is a fluorinated oil. Alternatively, the applicable temperature range of the hydrodynamic bearing 1 is -50°C to 160°C, and the working fluid is a silicone oil.
[0015] The bushing 2 includes a first connecting part 21 and a second connecting part 22 integrally formed with the first connecting part 21. The mounting hole 3 includes a first channel 31 and a second channel 32 communicating with the first channel 31. The first channel 31 is located in the first connecting part 21, the second channel 32 is located in the second connecting part 22, and the hydrodynamic bearing 1 is located in the first channel 31.
[0016] The guide groove 41 extends along the through hole 4 of the rotating shaft to both ends of the hydrodynamic bearing 1. In another embodiment, such as Figure 5 As shown, the guide groove 41 has two sets of end faces near the dynamic pressure bearing 1.
[0017] In this embodiment, the riveting structure of the hydrodynamic bearing and bushing of this invention is applied to, for example... Figure 6 The laser motor shown includes a mounting base plate 100, a control circuit board 200, a motor assembly 300, and a riveting structure for the hydrodynamic bearing and bushing disposed within the motor assembly. The control circuit board 200 and the motor assembly 300 are both disposed on the mounting base plate 100, and the control circuit board 200 is electrically connected to the motor assembly 300.
[0018] The working process of this utility model is as follows: The dynamic pressure bearing 1 is installed in the mounting hole 3 on the bushing 2. Since the vent groove 5 is arranged parallel to the mounting hole 3, during the installation process, the stagnant gas in the mounting hole 3 of the dynamic pressure bearing 1 and the bushing 2 is discharged, preventing the dynamic pressure bearing 1 from being misaligned or having a small installation gap, thus ensuring that the dynamic pressure bearing 1 is fully assembled and riveted to the bushing 2.
[0019] Finally, it should be emphasized that the above description is not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A riveting structure of a dynamic pressure bearing and a bushing, comprising a dynamic pressure bearing (1) and a bushing (2), characterized in that: The dynamic pressure bearing (1) is riveted inside the bushing (2). The bushing (2) is provided with a mounting hole (3) that is compatible with the dynamic pressure bearing (1). The center of the dynamic pressure bearing (1) is provided with a shaft through hole (4) along the axial direction. At least one set of ventilation grooves (5) is provided on the outer wall of the dynamic pressure bearing (1). The ventilation grooves (5) are arranged parallel to the mounting hole (3). Several guide grooves (41) are provided on the inner wall of the shaft through hole (4). The guide grooves (41) are arranged in a V shape. A shaft (6) is inserted into the shaft through hole (4). The working fluid is stored between the shaft (6) and the dynamic pressure bearing (1) through the guide grooves (41).
2. The riveting structure of a dynamic pressure bearing and a shaft sleeve according to claim 1, characterized in that: The bushing (2) includes a first connecting part (21) and a second connecting part (22) integrally formed with the first connecting part (21). The mounting hole (3) includes a first channel (31) and a second channel (32) communicating with the first channel (31). The first channel (31) is located in the first connecting part (21), and the second channel (32) is located in the second connecting part (22). The hydrodynamic bearing (1) is located in the first channel (31).
3. The riveting structure of a dynamic pressure bearing and a shaft sleeve according to claim 1, characterized in that: The ventilation slots (5) are arranged in three sets in a circular array.
4. The riveting structure of a dynamic pressure bearing and a shaft sleeve according to claim 1, characterized in that: The guide groove (41) extends along the through hole (4) of the rotating shaft to both ends of the hydrodynamic bearing (1).
5. The riveted structure of a dynamic pressure bearing and a shaft sleeve according to claim 1, characterized in that: The working fluid is lubricating oil.