Positioning structure and motor of the shaft axial detection part

Abstract

The present invention provides a positioning structure of an axial detection member of a rotating shaft and a motor, wherein the positioning structure includes a rotating shaft, the rotating shaft includes a first shaft section and a second shaft section arranged adjacent to each other along the axial direction thereof, the diameter of the second shaft section is larger than the diameter of the first shaft section, and along the axial direction from the first shaft section to the second shaft section, a threaded fastener, a first gasket, an axial detection member, and a second gasket are sequentially and adjacently mounted on the first shaft section, and the side of the second gasket away from the axial detection member is adjacent to the end face of the second shaft section facing the first shaft section. According to the present invention, the distance between the threaded fastener and the end face of the second shaft section remains unchanged, thereby ensuring that the dynamic balance of the rotor is not destroyed due to the disassembly of the motor, thereby effectively preventing the motor vibration phenomenon caused thereby.

Description

Technical Field

[0001] The invention belongs to the technical field of motor manufacturing, and in particular relates to a positioning structure of a rotating shaft axial detection part and a motor. Background Art

[0002] As the country promotes industrial upgrading, the motor field continues to develop towards high speed and miniaturization. As the motor power and speed gradually increase, the stability of the rotor during high-speed operation has a very important impact on the electromagnetic performance, vibration and noise of the motor. Therefore, the entire system puts forward higher requirements for the dynamic balance of the rotor.

[0003] At present, it is known that the axial detection device and the main shaft in the motor adopt an interference fit, and the axial detection device needs to be hot-fitted into the shaft. Since the guide parts of the axial detection device are relatively small and have a high heat rate, the axial detection device needs to be quickly transferred to the main shaft after preheating. In addition, since there is no limit structure designed between the axial detection device and the main shaft, during repeated disassembly and assembly, it cannot be guaranteed that the axial detection device can be installed back to its original position, and the interference fit will also become smaller. The axial sensor (that is, the axial detection component) in the related technology has a linear range of detection signal and distance. There is a gasket between the axial detection component and the rotating shaft to locate the axial position of the axial detection device to ensure that the distance between the axial detection device and the axial sensor is in the linear range. There is no gasket between the precision nut and the axial detection device. When the motor is assembled, there is an error in the axial position of the stator component. In order to ensure the distance between the axial detection device and the sensor, a gasket is also required to leave a margin in the axial position of the axial detection device for subsequent adjustment. In order to eliminate the axial assembly error of the motor stator component, the axial position of the axial detection part needs to be adjusted within a certain range. This adjustment process requires changing the gasket thickness. After adjusting gaskets of different thicknesses, the axial position of the precision nut will change, that is, it cannot be guaranteed that the precision nut can be screwed to the same position as before. In this way, the dynamic balance of the rotor is destroyed after adjustment, resulting in severe motor vibration. Summary of the invention

[0004] Therefore, the present invention provides a positioning structure of a rotating shaft axial detection member and a motor, which can overcome the shortcomings of the related art that the threaded fasteners may cause axial displacement during the disassembly and assembly of the motor, thereby destroying the dynamic balance of the rotor and causing serious vibration of the motor.

[0005] In order to solve the above problems, the present invention provides a positioning structure of an axial detection part of a rotating shaft, including a rotating shaft, wherein the rotating shaft includes a first shaft segment and a second shaft segment adjacent to each other along its axial direction, the diameter of the second shaft segment is larger than the diameter of the first shaft segment, and along the axial direction from the first shaft segment to the second shaft segment, a threaded fastener, a first gasket, an axial detection part, and a second gasket are sequentially and adjacently mounted on the first shaft segment, and the side of the second gasket away from the axial detection part is adjacent to the end face of the second shaft segment facing the first shaft segment.

[0006] Preferably, the first shaft segment has a boss adjacent to the second shaft segment, the boss is cylindrical and coaxial with the first shaft segment, the axial detection member and the second gasket are mounted on the outer peripheral wall of the boss, and the diameter of the boss is smaller than the diameter of the second shaft segment.

[0007] Preferably, there is a clearance fit between the axial detection member and the boss.

[0008] Preferably, the axial detection member has a first through hole fitted with the boss, the fitting length between the first through hole and the boss is La, the axial thickness of the second gasket is d, the axial length of the boss is Lb, and La+d>Lb.

[0009] Preferably, the axial detection member also has a detection portion located at the outer periphery of the first through hole, the detection portion has a detection surface facing the second shaft segment, an annular groove is constructed on the detection surface, the annular groove is coaxially arranged with the first through hole and located at the opening of the first through hole, the diameter of the outer annular wall of the annular groove is larger than the diameter of the second shaft segment, and the second gasket is located in the annular groove.

[0010] Preferably, a first anti-rotation structure is provided between the first through hole and the boss to prevent relative displacement between the axial detection member and the rotating shaft in the circumferential direction of the rotating shaft; and / or a second anti-rotation structure is provided between the second through hole of the second gasket and the boss to prevent relative displacement between the second gasket and the rotating shaft in the circumferential direction of the rotating shaft.

[0011] Preferably, the first anti-rotation structure includes a first protrusion arranged on the hole wall of the first through hole and a first groove arranged on the outer peripheral wall of the boss; or, the first anti-rotation structure includes a first groove arranged on the hole wall of the first through hole and a first protrusion arranged on the outer peripheral wall of the boss.

[0012] Preferably, the second anti-rotation structure includes a second protrusion arranged on the hole wall of the second through hole and a second groove arranged on the outer peripheral wall of the boss; or, the second anti-rotation structure includes a second groove arranged on the hole wall of the second through hole and a second protrusion arranged on the outer peripheral wall of the boss.

[0013] Preferably, when the first groove and the second groove are simultaneously arranged on the boss, the first groove and the second groove are connected to form a straight groove, and the straight groove extends along the axial direction of the rotating shaft.

[0014] The present invention also provides a motor, comprising the above-mentioned positioning structure of the rotating shaft axial detection member.

[0015] The present invention provides a positioning structure of an axial detection part of a rotating shaft and a motor, wherein a first gasket and a second gasket are respectively arranged on both axial sides of the axial detection part, so that the first gasket and the second gasket of appropriate thickness can be selected according to the specific model of the motor, thereby ensuring that after the threaded fastener applies a preset force to the first gasket, the distance between the threaded fastener and the end face of the second shaft segment facing the first shaft segment remains unchanged, that is, the axial position of the threaded fastener before and after disassembly of the motor remains consistent and does not change, thereby ensuring that the dynamic balance of the rotor is not destroyed due to the disassembly of the motor, thereby effectively preventing the occurrence of motor vibration caused thereby. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram (cross-sectional view) of a positioning structure of a rotating shaft axial detection member according to an embodiment of the present invention;

[0017] Figure 2 It is a three-dimensional structural schematic diagram of a positioning structure of a rotating shaft axial detection member according to an embodiment of the present invention;

[0018] Figure 3 It is a three-dimensional structural schematic diagram of a positioning structure of a rotating shaft axial detection member according to another embodiment of the present invention;

[0019] Figure 4 The figure is a schematic three-dimensional structural diagram of a positioning structure of an axial detection member of a rotating shaft according to another embodiment of the present invention.

[0020] The reference numerals are as follows:

[0021] 1. Rotating shaft; 11. First shaft section; 12. Second shaft section; 13. Boss; 21. Threaded fastener; 22. First gasket; 23. Axial detection member; 231. First through hole; 232. Detection surface; 233. Annular groove; 24. Second gasket; 241. Second through hole; 31. First protrusion; 32. First groove; 41. Second protrusion; 42. Second groove; 5. Straight groove. DETAILED DESCRIPTION

[0022] See also Figures 1 to 4 As shown, according to an embodiment of the present invention, a positioning structure of an axial detection member of a rotating shaft is provided, comprising a rotating shaft 1, wherein the rotating shaft 1 comprises a first shaft segment 11 and a second shaft segment 12 which are adjacently arranged along the axial direction thereof (it can be understood that the two are coaxially arranged), the diameter of the second shaft segment 12 is larger than the diameter of the first shaft segment 11, so that a positioning shoulder is formed on the side of the second shaft segment 12 facing the first shaft segment 11, and along the axial direction from the first shaft segment 11 to the second shaft segment 12, a threaded fastener 21 (such as a precision nut in the prior art), a first gasket 22, and an axial detection member 23 (an axial displacement detection component such as a specific sensor (not shown in the figure) can detect the corresponding part of the axial detection member 23 to realize the axial position of the rotating shaft 1 The second gasket 24 is moved for real-time detection, and the second gasket 24 is adjacent to the end face of the second shaft segment 12 facing the first shaft segment 11 on the side away from the axial detection member 23. The threaded fastener 21 and the end face of the second shaft segment 12 facing the first shaft segment 11 jointly form a clamp for the first gasket 22, the axial detection member 23, and the second gasket 24, thereby forming axial and circumferential positioning of the axial detection member 23. Any one of the first gasket 22 and the second gasket 24 can be replaced, that is, according to the actual situation of the motor, the first gasket 22 and the second gasket 24 can be replaced with gaskets of different thicknesses respectively to ensure that the axial position of the threaded fastener 21 remains unchanged after a preset force (which is a known quantity) is applied to the first gasket 22. In this technical solution, a first gasket 22 and a second gasket 24 are respectively arranged on both axial sides of the axial detection member 23, so that the first gasket 22 and the second gasket 24 of appropriate thickness can be selected according to the specific model of the motor, so as to ensure that after the threaded fastener 21 applies a preset force to the first gasket 22, the distance between the threaded fastener 21 and the end face of the second shaft segment 12 facing the first shaft segment 11 remains unchanged, that is, the axial position of the threaded fastener 21 before and after the motor is disassembled remains consistent and does not change, so as to ensure that the dynamic balance of the rotor is not destroyed due to the disassembly of the motor, thereby effectively preventing the motor vibration phenomenon caused thereby.

[0023] In some embodiments, the first shaft section 11 has a boss 13 adjacent to the second shaft section 12, the boss 13 is cylindrical and coaxial with the first shaft section 11, the axial detection member 23 and the second gasket 24 are mounted on the outer peripheral wall of the boss 13, the diameter of the boss 13 is smaller than the diameter of the second shaft section 12, the axial detection member 23 has a first through hole 231 mounted with the boss 13, the diameter of the first through hole 231 needs to match the boss 13, that is, larger than the diameter of the first shaft section 11, which can effectively prevent the threaded section on the first shaft section 11 (the part threadedly connected to the threaded fastener 21) from being damaged during the mounting process of the axial detection member 23. Preferably, the axial detection member 23 is clearance-fitted with the boss 13, and the clearance value of the clearance-fitting is δ, 0mm<δ≤0.03mm, rather than the hot-fitting method in the related art, which greatly facilitates the positioning and assembly process of the axial detection member 23.

[0024] The matching length between the first through hole 231 and the boss 13 is La, the axial thickness of the second gasket 24 is d, the axial length of the boss 13 is Lb, La+d>Lb, so that the first gasket 22 can directly contact the side of the axial detection part 23, which makes the axial positioning of the axial detection part 23 by the threaded fastener 21 more reliable.

[0025] The axial detection member 23 also has a detection portion located at the periphery of the first through hole 231, and the detection portion has a detection surface 232 facing the second shaft segment 12. Since the machining accuracy of the detection surface 232 will directly affect the detection accuracy of the corresponding axial displacement detection component, the flatness machining requirements of the detection surface 232 are extremely high, and the protection of this detection surface 232 is also particularly important. Therefore, in some embodiments, an annular groove 233 is constructed on the detection surface 232, and the annular groove 233 is coaxially arranged with the first through hole 231 and is located at the first The opening of the through hole 231, the diameter of the outer ring wall of the annular groove 233 is larger than the diameter of the second shaft segment 12, and the second gasket 24 is in the annular groove 233. In this way, on the one hand, the area of ​​the detection surface 232 that requires high-precision processing is reduced, which can reduce the processing and manufacturing costs brought by machining. On the other hand, the second gasket 24 is arranged in the annular groove 233 and contacts with the end faces of the axial detection member 23 and the second shaft segment 12, thereby preventing the detection surface 232 from directly contacting the end face of the second shaft segment 12, which may cause wear and damage during the disassembly and assembly of the rotating shaft.

[0026] In the prior art, there is no circumferential limit device between the axial detection part 23 and the rotating shaft 1. When the precision nut is tightened, the axial detection part 23 will rotate with the rotation of the precision nut. Even if the position mark between the axial detection part 23 and the rotating shaft 1 is made, the mark of the axial detection part cannot be 100% aligned with the corresponding mark of the rotating shaft 1. Therefore, each disassembly and assembly of the motor will destroy the dynamic balance of the rotor, causing serious vibration of the motor. In order to overcome this defect, in some embodiments, a first anti-rotation structure is provided between the first through hole 231 and the boss 13 to prevent the axial detection part 23 and the rotating shaft 1 from generating relative displacement in the circumferential direction of the rotating shaft 1; and / or a second anti-rotation structure is provided between the second through hole 241 of the second gasket 24 and the boss 13 to prevent the second gasket 24 and the rotating shaft 1 from generating relative displacement in the circumferential direction of the rotating shaft 1.

[0027] As a specific implementation of the first anti-rotation structure, the first anti-rotation structure includes a first protrusion 31 provided on the hole wall of the first through hole 231 and a first groove 32 provided on the outer peripheral wall of the boss 13; or, the first anti-rotation structure includes a first groove 32 provided on the hole wall of the first through hole 231 and a first protrusion 31 provided on the outer peripheral wall of the boss 13. As a specific implementation of the second anti-rotation structure, the second anti-rotation structure includes a second protrusion 41 provided on the hole wall of the second through hole 241 and a second groove 42 provided on the outer peripheral wall of the boss 13; or, the second anti-rotation structure includes a second groove 42 provided on the hole wall of the second through hole 241 and a second protrusion 41 provided on the outer peripheral wall of the boss 13. When the first groove 32 and the second groove 42 are provided on the boss 13 at the same time, the first groove 32 and the second groove 42 are connected to form a straight groove 5, and the straight groove 5 extends along the axial direction of the rotating shaft 1, thereby simplifying the formation process of related components.

[0028] The first protrusion 31 and the first groove 32, the second protrusion 41 and the second groove 42 are respectively arranged to match each other. Generally speaking, a plurality of them are evenly spaced along the circumference of the shaft 1 to ensure the dynamic balance of the shaft 1. The first groove 32 and the second groove 42 can have various shapes, such as straight strips, L shapes, and other suitable shapes.

[0029] According to an embodiment of the present invention, there is further provided a motor, comprising the above-mentioned positioning structure of the rotating shaft axial detection member.

[0030] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0031] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention. The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention, and these improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A positioning structure for an axial detection member of a rotating shaft, characterized in that: The rotary shaft (1) comprises a first shaft section (11) and a second shaft section (12) which are adjacently arranged along the axial direction thereof; the diameter of the second shaft section (12) is larger than the diameter of the first shaft section (11); along the axial direction from the first shaft section (11) to the second shaft section (12), a threaded fastener (21), a first gasket (22), an axial detection member (23), and a second gasket (24) are sequentially and adjacently mounted on the first shaft section (11); a side of the second gasket (24) away from the axial detection member (23) is adjacent to an end face of the second shaft section (12) facing the first shaft section (11); the first shaft section (11) has a boss (13) adjacent to the second shaft section (12); the boss (13) is cylindrical and coaxial with the first shaft section (11); the axial detection member (23) and the second gasket (24) are adjacent to each other. The axial detection member (23) is sleeved on the outer peripheral wall of the boss (13), the diameter of the boss (13) being smaller than the diameter of the second shaft segment (12); the axial detection member (23) has a first through hole (231) sleeved with the boss (13); the axial detection member (23) also has a detection portion located on the outer periphery of the first through hole (231), the detection portion having a detection surface (232) facing the second shaft segment (12), an annular groove (233) being constructed on the detection surface (232), the annular groove (233) being coaxially arranged with the first through hole (231) and located at the opening of the first through hole (231), the outer annular wall of the annular groove (233) having a diameter larger than the diameter of the second shaft segment (12), and the second gasket (24) being located in the annular groove (233); the axial detection member (23) and the boss (13) are clearance-fitted.

2. The positioning structure according to claim 1, characterized in that: The matching length between the first through hole (231) and the boss (13) is La, the axial thickness of the second gasket (24) is d, the axial length of the boss (13) is Lb, and La+d>Lb.

3. The positioning structure according to claim 2, characterized in that: A first anti-rotation structure is provided between the first through hole (231) and the boss (13) to prevent the axial detection member (23) and the rotating shaft (1) from being relatively displaced in the circumferential direction of the rotating shaft (1); and / or a second anti-rotation structure is provided between the second through hole (241) of the second gasket (24) and the boss (13) to prevent the second gasket (24) and the rotating shaft (1) from being relatively displaced in the circumferential direction of the rotating shaft (1).

4. The positioning structure according to claim 3, characterized in that: The first anti-rotation structure comprises a first protrusion (31) arranged on the hole wall of the first through hole (231) and a first groove (32) arranged on the outer peripheral wall of the boss (13); or the first anti-rotation structure comprises a first groove (32) arranged on the hole wall of the first through hole (231) and a first protrusion (31) arranged on the outer peripheral wall of the boss (13).

5. The positioning structure according to claim 3 or 4, characterized in that: The second anti-rotation structure comprises a second protrusion (41) arranged on the hole wall of the second through hole (241) and a second groove (42) arranged on the outer peripheral wall of the boss (13); or the second anti-rotation structure comprises a second groove (42) arranged on the hole wall of the second through hole (241) and a second protrusion (41) arranged on the outer peripheral wall of the boss (13).

6. The positioning structure according to claim 5, characterized in that: When the first groove (32) and the second groove (42) are simultaneously arranged on the boss (13), the first groove (32) and the second groove (42) are connected to form a straight groove (5), and the straight groove (5) extends along the axial direction of the rotating shaft (1).

7. A motor, comprising a positioning structure for an axial detection member of a rotating shaft, characterized in that: The positioning structure of the rotating shaft axial detection member is the positioning structure of the rotating shaft axial detection member according to any one of claims 1 to 6.

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