A brushless motor rotor structure

Abstract

The utility model relates to a brushless motor rotor technical field especially a kind of brushless motor rotor structure, gear part is divided into stem and end, stem is perpendicular to end, part stem is inserted into end, and magnetic ring is sleeved on the end of gear part;Perforation is set in the central position of stem, and perforation is set along the length direction of stem, and the rotating shaft that cooperates with it is worn in perforation, and the end of stem close to end is locking portion, and outer tooth portion is equipped on the outer circumferential wall of the other end of stem away from end, and the locking portion of stem is cut along transverse and has accommodating groove, and limit piece is placed in accommodating groove, and stem and limit piece are spliced, and have elastic member. Through gear part, magnetic ring, limit piece and elastic member, the rotor swing and excessive noise caused by optimization rotor and rotating shaft gap cooperation technical problem;On rotor, elastic member is sleeved, and the problem of process production assembly and manufacturing cost complexity is solved.

Description

Technical Field

[0001] This utility model relates to the field of brushless motor rotor technology, and in particular to a brushless motor rotor structure. Background Technology

[0002] For brushless motors, the fit between the shaft and the through holes of the rotor is critical, and the current rotor structure has the following problems:

[0003] First: Due to machining errors, it is difficult to ensure that the dimensions of the holes between the shaft and the rotor are perfectly matched. If the holes between the shaft and the rotor are interference fit, the rotor is prone to seizing in the shaft and thus cannot rotate. If the holes between the shaft and the rotor are clearance fit, the rotor will run unevenly on the shaft, generating more noise and affecting the user experience.

[0004] Second: The existing rotor and shaft are mostly fitted with a shaft hole. In order to achieve smooth operation between the rotor hole and the shaft, a very high dimensional accuracy of the rotor hole diameter is required, which causes difficulties in the process. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a brushless motor rotor structure in order to solve the problems existing in the prior art in the background art.

[0006] The technical solution adopted by this utility model to solve its technical problem is: a brushless motor rotor structure, including a gear component, wherein the gear component is divided into a rod part and an end part, the rod part is perpendicular to the end part, and a magnetic ring is sleeved on the end part of the gear component;

[0007] A through hole is provided at the center of the rod, and the through hole is set along the length of the rod. A rotating shaft that matches it is inserted through the through hole. One end of the rod near the end is a locking part, and the other end of the rod away from the end has an external toothed part on its outer circumferential wall. A receiving groove is cut transversely on the locking part of the rod, and a limiting component is placed in the receiving groove. After the rod and the limiting component are assembled, an elastic component is fitted on it.

[0008] Furthermore, the outer surface of the limiting member is an arc surface, and a transverse arc groove extending in the transverse direction is provided on the outer arc surface of the limiting member, and the elastic member is engaged in the transverse arc groove.

[0009] The inner surface of the limiting component has a vertical arc-shaped groove extending in its vertical direction, and the curvature of the vertical arc-shaped groove is consistent with the curvature of the inner hole of the through hole.

[0010] Furthermore, both ends of the vertical arc groove and the horizontal arc groove are open, and the openings are located on the corresponding sides of the vertical arc groove and the horizontal arc groove, respectively.

[0011] Furthermore, the bottom of the receiving groove on the locking part of the rod intersects with the through hole, and the bottom of the receiving groove on the locking part of the rod is set parallel to the central axis of the through hole. The width W of the receiving groove is greater than the radius R of the locking part of the rod.

[0012] Furthermore, the length L1 of the limiting member is less than the length L2 of the receiving groove, and the length L2 of the receiving groove is less than the length L3 of the locking part of the rod.

[0013] Furthermore, the inner wall of the perforation and the rotating shaft are fitted with a clearance.

[0014] Furthermore, the magnetic ring and the gear component are connected by insert injection molding.

[0015] Furthermore, the elastic element, the limiting element, the gear element, and the rotating shaft are interference-fitted, so that the limiting element and the rotating shaft are in close contact.

[0016] Furthermore, a through hole is provided at the middle position of the end of the gear component. The through hole and the through hole are connected as one piece, and the axis of the through hole and the axis of the through hole are coaxially arranged.

[0017] Furthermore, the end face of the gear component near the locking part is provided with several fan-shaped grooves arranged in a circular array. The fan-shaped grooves extend toward the end of the gear component away from the locking part and do not penetrate the end of the gear component.

[0018] The beneficial effects of this utility model are: This utility model optimizes the technical problems of rotor oscillation and excessive noise caused by the clearance fit between the rotor and the shaft by using gear components, magnetic rings, limiting components and elastic components.

[0019] Meanwhile, by fitting elastic elements onto the rotor, the problems of complex process assembly and manufacturing costs can be solved. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Figure 1 This is a perspective view of the present invention;

[0022] Figure 2 This is a schematic diagram of the structure of this utility model;

[0023] Figure 3 This is a cross-sectional view of the present invention along direction AA;

[0024] Figure 4 This is an exploded view of this utility model;

[0025] Figure 5 This is an exploded view of the present invention from another direction;

[0026] Figure 6This is a structural schematic diagram of the limiting component of this utility model;

[0027] In the figure: 1. Gear component, 11. Through hole, 12. Receiving groove, 13. External tooth, 14. Through hole, 15. Sector groove, 2. Magnetic ring, 3. Limiting component, 31. Vertical arc groove, 32. Horizontal arc groove, 4. Elastic component. Detailed Implementation

[0028] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0029] like Figures 1-6 The illustrated brushless motor rotor structure includes a gear component 1, which is divided into a rod and an end. The rod is perpendicular to the end. A magnetic ring 2 is fitted on the end of the gear component 1 to provide the magnetic field required by the patent. When the stator winding is energized to generate a rotating magnetic field, the magnetic field of the magnetic ring 2 interacts with it to generate an electromagnetic force that drives the rotor to rotate.

[0030] A through hole 11 is provided at the center of the rod, and the through hole 11 is set along the length of the rod. A rotating shaft that mates with the through hole 11 passes through the through hole 11. The inner wall of the through hole 11 and the rotating shaft are clearance fit (not shown in the figure). The rotation center shaft of the rotor assembly passes through the through hole 11 and the through hole 14, and is finally clamped and fixed by the combination structure of the limiting member 3 and the elastic member 4, supporting the rotation of the entire rotor assembly. It is installed on the motor housing through the bearings at both ends, and it transmits the torque generated by the rotor. One end of the rod near the end is a locking part, away from the other end. The other end of the rod has an external toothed part 13 on its outer circumferential wall. The locking part of the rod has a receiving groove 12 cut transversely along its upper edge. A limiting member 3 is placed in the receiving groove 12. After the rod and the limiting member 3 are assembled, an elastic member 4 is fitted on it. The limiting member 3 abuts against the rotating shaft. That is to say, after being assembled with the gear part 1 in the receiving groove 12, the limiting member 3 is tightly fitted with the rotating shaft through the cooperation of the elastic member 4, clamping and fixing the rotating shaft in the through hole 11. This prevents the rotor from swaying when it rotates, thereby reducing the mechanical noise generated by unbalanced rotation.

[0031] like Figure 6 As shown, the outer surface of the limiting member 3 is an arc surface, which matches the inner ring of the elastic member 4, making it easy to assemble and bear force. A transverse arc groove 32 extending in the transverse direction is provided on the outer arc surface of the limiting member 3 to accommodate and position the elastic member 4. The elastic member 4 is locked in the transverse arc groove 32 to ensure that the force applied by the elastic member 4 can be effectively transmitted to the rotating shaft through the limiting member 3.

[0032] The inner surface of the limiting member 3 is provided with a vertical arc groove 31 extending in its vertical direction. The curvature of the vertical arc groove 31 is consistent with the curvature of the inner hole of the through hole 11, so that the limiting member 3 can fit tightly against the surface of the rotating shaft, providing a larger base area and uniform clamping force.

[0033] Both ends of the vertical arc groove 31 and the horizontal arc groove 32 are open, and the openings are located on the corresponding sides of the vertical arc groove 31 and the horizontal arc groove 32, respectively.

[0034] like Figure 5 As shown, the bottom of the receiving groove 12 on the locking part of the rod intersects with the through hole 11. The bottom of the receiving groove 12 on the locking part of the rod is parallel to the central axis of the through hole 11. The width W of the receiving groove 12 is greater than the radius R of the locking part of the rod.

[0035] The length L1 of the limiting member 3 is less than the length L2 of the receiving groove 12, and the length L2 of the receiving groove 12 is less than the length L3 of the locking part of the rod.

[0036] The magnetic ring 2 and the gear component 1 are connected by an insert injection molding, which achieves a firm, reliable and precise connection, ensuring that the magnetic ring 2 is accurately positioned and not easily falls off.

[0037] In addition, the elastic element 4 is interference-fitted with the limiting element 3, the gear element 1 and the rotating shaft. Through the elastic tension of the elastic element 4 itself, it is stuck in the transverse arc groove 32 of the limiting element 3 and applies radial pressure inward, so that the limiting element 3 and the rotating shaft are tightly attached.

[0038] This radial pressure forces the limiting member 3 to press against the rotating shaft, while the other side of the limiting member 3 is restricted by the side wall of the receiving groove 12. Finally, the elastic member 4 firmly holds and fixes the rotating shaft in the through hole 11 of the gear member 1 through the limiting member 3, realizing a keyless connection or an auxiliary key connection, compensating for the small gap generated by the clearance fit between the through hole 11 and the rotating shaft, and preventing the rotating shaft from shaking or slipping in the holes of the through hole 11 and the through hole 14.

[0039] A through hole 14 is provided at the middle position of the end of the gear component 1. The through hole 14 is connected to the through hole 11 as a whole, and the axis of the through hole 14 is coaxial with the axis of the through hole 11.

[0040] The end face of the gear component 1 near the locking part is provided with a plurality of sector grooves 15 arranged in a ring array. The sector grooves 15 extend toward the end of the gear component 1 away from the locking part and do not penetrate the end of the gear component 1, thereby reducing the end weight, reducing the rotor rotational inertia, and improving the response speed.

[0041] Work process:

[0042] Step 1: The magnetic ring 2 is firmly fixed to the end of the gear component 1 by insert injection molding, forming the rotor body that generates the magnetic field;

[0043] Step 2: The shaft passes through the through hole 11 and the through hole 14 at the center of the gear part 1;

[0044] Step 3: The limiting member 3 is placed into the receiving groove 12 of the locking part of the gear member 1, and its vertical arc groove 31 surface is in contact with the rotating shaft;

[0045] Step 4: The elastic element 4 is forcefully inserted into the horizontal arc groove 32 on the outer surface of the limiting element 3;

[0046] Step 5: The elastic contraction force of the elastic element 4 is converted into a radial clamping force on the rotating shaft through the limiting element 3;

[0047] Step 6: The clamping force in step 5 causes the limiting member 3 to press tightly against the rotating shaft. At the same time, the limiting member 3 is blocked by the side wall of the receiving groove 12, thereby firmly fixing the rotating shaft in the through hole 11 of the gear member 1, realizing the torque transmission between the two.

[0048] Step 7: When the motor stator is energized and generates a rotating magnetic field, it drives the gear component 1 with the magnetic ring 2 to rotate around the shaft;

[0049] The external teeth 13 on the rotating gear 1 in step 8 can simultaneously drive an external load or a transmission mechanism.

[0050] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A brushless motor rotor structure, characterized by: The gear (1) includes a gear component (1), which is divided into a rod and an end. The rod is perpendicular to the end. A magnetic ring (2) is fitted on the end of the gear component (1). A through hole (11) is provided at the center of the rod. The through hole (11) is set along the length of the rod. A rotating shaft that cooperates with it is inserted in the through hole (11). One end of the rod near the end is a locking part. The other end of the rod away from the end is provided with an external toothed part (13) on the outer circumferential wall. A receiving groove (12) is cut transversely on the locking part of the rod. A limiting member (3) is placed in the receiving groove (12). After the rod and the limiting member (3) are assembled, an elastic member (4) is fitted on it.

2. A brushless motor rotor structure according to claim 1, characterized in that: The outer surface of the limiting member (3) is an arc surface, and a transverse arc groove (32) extending in the transverse direction is provided on the outer arc surface of the limiting member (3). The elastic member (4) is stuck in the transverse arc groove (32). The inner surface of the limiting member (3) is provided with a vertical arc groove (31) extending in its vertical direction, and the curvature of the vertical arc groove (31) is consistent with the curvature of the inner hole of the through hole (11).

3. A brushless motor rotor structure according to claim 2, wherein: Both ends of the vertical arc groove (31) and the horizontal arc groove (32) are open, and the openings are located on the corresponding sides of the vertical arc groove (31) and the horizontal arc groove (32), respectively.

4. A brushless motor rotor structure according to claim 1, characterized in that: The bottom of the receiving groove (12) on the locking part of the rod intersects with the through hole (11). The bottom of the receiving groove (12) on the locking part of the rod is set parallel to the central axis of the through hole (11). The width W of the receiving groove (12) is greater than the radius R of the locking part of the rod.

5. A brushless motor rotor structure as claimed in claim 1, wherein: The length L1 of the limiting member (3) is less than the length L2 of the receiving groove (12), and the length L2 of the receiving groove (12) is less than the length L3 of the locking part of the rod.

6. A brushless motor rotor structure as claimed in claim 1, wherein: The inner wall of the perforation (11) and the rotating shaft are in clearance fit.

7. A brushless motor rotor structure as claimed in claim 1, wherein: The magnetic ring (2) and the gear component (1) are connected by insert injection molding.

8. A brushless motor rotor structure as claimed in claim 1, characterized in that: The elastic element (4) is interference-fitted with the limiting element (3), the gear element (1) and the rotating shaft, so that the limiting element (3) is in close contact with the rotating shaft.

9. A brushless motor rotor structure as claimed in claim 1, wherein: A through hole (14) is provided at the middle position of the end of the gear component (1). The through hole (14) and the through hole (11) are connected in one piece, and the axis of the through hole (14) and the axis of the through hole (11) are coaxially arranged.

10. A brushless motor rotor structure as claimed in claim 1, wherein: The end face of the gear component (1) near the locking part is provided with a plurality of fan-shaped grooves (15) arranged in a ring array. The fan-shaped grooves (15) extend toward the end of the gear component (1) away from the locking part and do not penetrate the end of the gear component (1).

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