Snap-on rotor assembly

Abstract

The utility model provides a kind of clamping formula rotor assembly, including rotating shaft and the iron core of sleeve joint rotating shaft, and iron core is formed by silicon steel sheet axial stacking, and the outside of rotating shaft is provided with protrusion, and the clamping strip of rotating shaft axial extension;The inner wall of silicon steel sheet and clamping strip are connected with interference fit. Through rotating shaft outside surface setting axial extension clamping strip, and with the inner wall of silicon steel sheet using interference fit connection, even, the assembly between iron core and rotating shaft is realized, to splice into integral structure's iron core. The structure cancels the traditional riveting process, to avoid the silicon steel sheet deformation and position deviation caused by local stress in riveting process, reduce the deviation of iron core overall axis and rotating shaft axis, to significantly improve the coaxiality of rotor assembly. Under high speed condition, rotor dynamic balance performance is greatly improved, effectively suppresses the vibration and noise caused by unbalanced torque. And cancel riveting process, also reduce the production cost of rotor assembly.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, specifically a snap-fit ​​rotor assembly. Background Technology

[0002] The rotor assembly is one of the core components of an electric motor, typically consisting of a shaft and an iron core fitted onto the shaft. The iron core is generally formed by stacking multiple silicon steel sheets axially, and its function is to bear the magnetic field and transmit torque. In traditional manufacturing processes, the iron core is usually formed by riveting, that is, fixing multiple silicon steel sheets together through riveting points to form an integral structure.

[0003] However, the above riveting process has certain drawbacks in practical applications. Because a certain amount of mechanical force needs to be applied during riveting, this force can easily cause localized deformation of the silicon steel sheets, leading to slight misalignments in their relative positions. This deformation and misalignment further cause deviations between the overall core axis and the rotor shaft axis, affecting the coaxiality of the rotor assembly. When the rotor rotates at high speed, this axial misalignment will result in unbalanced torque, severely affecting the rotor's dynamic balance performance, leading to increased vibration and noise, and reducing the motor's efficiency and service life.

[0004] Therefore, how to overcome the above-mentioned defects has become an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0005] To address the technical problems in the background art, this utility model discloses a snap-fit ​​rotor assembly.

[0006] This utility model provides a snap-fit ​​rotor assembly, including a rotating shaft and an iron core that fits onto the rotating shaft. The iron core is formed by axially stacking silicon steel sheets, and the outer side of the rotating shaft is provided with a protruding snap-fit ​​strip that extends axially along the rotating shaft. The inner wall of the silicon steel sheet is interference-fitted with the clamping strip.

[0007] Furthermore, baffles for connecting the rotating shaft are attached to both sides of the iron core.

[0008] Furthermore, the baffle and the locking strip are connected by an interference fit.

[0009] Furthermore, a boss is provided at the center of the outer side of the baffle; The inner wall of the baffle extends to the outer side of the boss.

[0010] Furthermore, the boss is shaped like a frustum, with its constricted end located at the outer end of the boss.

[0011] Furthermore, a radially protruding mounting cylinder is provided in the middle of the iron core; The retaining strip is located on the outer side of the mounting cylinder; Silicon steel sheets and baffles are connected to the mounting cylinder; The two ends of the mounting cylinder are provided with external chamfers.

[0012] Furthermore, the thickness of the card strip along the radial direction of the pivot is 0.1-0.15mm.

[0013] The beneficial effects of this invention are as follows: By setting axially extending retaining strips on the outer side of the shaft and connecting them with the inner wall of the silicon steel sheets using an interference fit, uniform and tight assembly between the iron core and the shaft is achieved, thus forming an integral iron core structure. This structure eliminates the traditional riveting process, thereby avoiding deformation and positional displacement of the silicon steel sheets caused by localized stress during riveting, reducing the deviation between the overall axis of the iron core and the axis of the shaft, and significantly improving the coaxiality of the rotor assembly. Under high-speed conditions, the rotor dynamic balance performance is greatly improved, effectively suppressing vibration and noise caused by unbalanced torque. Moreover, eliminating the riveting process also reduces the production cost of the rotor assembly. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0015] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a front sectional view of the present invention; Figure 3 is Figure 2 Enlarged view of point A in the middle; Figure 4 This is a schematic diagram showing the structure of only one silicon steel sheet in this utility model; Figure 5 This is an axial view of the shaft; In the diagram: 1. Shaft; 2. Iron core; 3. Silicon steel sheet; 4. Clamping bar; 5. Baffle; 6. Boss; 7. Mounting cylinder; 8. Outer chamfer; 9. Bearing. Detailed Implementation

[0016] 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.

[0017] like Figure 1 and Figure 2 As shown, this utility model discloses a snap-fit ​​rotor assembly, including a rotating shaft 1 and an iron core 2 that is sleeved on the rotating shaft 1. The iron core 2 is formed by axially stacking silicon steel sheets 3.

[0018] A radially protruding, cylindrical mounting cylinder 7 is provided at the middle position of the rotating shaft 1. The mounting cylinder 7 is coaxial with the rotating shaft 1, and its two ends form shoulders for engaging the bearing 9 used for rotating the rotating shaft 1. The mounting cylinder 7 only abuts against the inner ring of the bearing 9, thereby realizing the rotating connection of the rotating shaft 1.

[0019] like Figure 5 As shown, the outer wall of the mounting cylinder 7 is provided with protrusions and retaining strips 4 that extend axially along the rotating shaft 1. The retaining strips 4 extend to both ends of the mounting cylinder 7, and the retaining strips 4 are configured as eight strips evenly arranged circumferentially along the mounting cylinder 7.

[0020] like Figure 4 As shown, the silicon steel sheet 3 is sleeved on the mounting cylinder 7, and its inner wall is interference-fitted with the retaining strip 4 to fix the silicon steel sheet 3. The thickness of the retaining strip 4 along the radial direction of the rotating shaft 1 ranges from 0.1 to 0.15 mm. The reason for this setting is that if the retaining strip 4 is too thin, the interference fit will be insufficient, and its connection strength will also be insufficient. Under high-speed rotation, the iron core 2 and the rotating shaft 1 may slip or loosen relative to each other, and the torque cannot be effectively transmitted. If the retaining strip 4 is too thick, it will lead to excessive assembly stress, causing excessive deformation of the silicon steel sheet 3, resulting in twisting and breakage, affecting the coaxiality of the silicon steel sheet 3 and the rotating shaft 1. The thickness of 0.1-0.15 mm is just enough to generate sufficient friction and clamping force to ensure that the iron core 2 is firmly fixed on the rotating shaft 1, meeting the requirements of torque transmission.

[0021] To improve the positional stability of the silicon steel sheet 3, baffles 5, which are fitted onto the rotating shaft 1, are attached to both sides of the iron core 2. The baffles 5 are also fixed by interference fit with the clamping strip 4. The baffles 5 form a clamping force on the silicon steel sheet 3, and under the combined effect of the interference fit, the structural rigidity and stability of the iron core 2 are higher, which can effectively prevent the silicon steel sheet 3 from axial movement or loosening during motor operation.

[0022] Traditional rotor assembly dynamic balancing is achieved through an additive method (adding glue to the silicon steel sheet 3), which has the following drawbacks: 1. Under high temperatures, the glue softens, deforms, or becomes brittle, and may even fall off; 2. The glue is prone to aging after prolonged use; 3. The glue has an irregular shape, making adjustment difficult; 4. The glue affects heat dissipation. However, the baffle 5 in this application, adjusted through a subtractive method (cutting the baffle 5), completely avoids these drawbacks.

[0023] To improve the positional stability of baffle 5 and the strength of the connection structure, such as Figure 3 As shown, a raised, coaxially arranged boss 6 is provided at the center of the outer side of the baffle 5; the boss 6 is frustum-shaped, with its constricted end located at the outer end of the boss 6. The inner wall of the baffle 5 extends to the outer side of the boss 6. This arrangement extends the length of the inner hole of the baffle 5, increases the contact area between the baffle 5 and the retaining strip 4, increases the friction between the baffle 5 and the retaining strip 4, thereby increasing the stability of the baffle 5 and the strength of the connection structure.

[0024] The two ends of the mounting cylinder 7 are also provided with external chamfers 8, which serve as guides for the sleeved silicon steel sheet 3 and the baffle 5.

[0025] Compared to existing technologies, the advantages of this embodiment are: by setting an axially extending retaining strip 4 on the outer side of the rotating shaft 1 and connecting it to the inner wall of the silicon steel sheet 3 with an interference fit, a uniform and tight assembly between the iron core 2 and the rotating shaft 1 is achieved, thus splicing the iron core 2 into an integral structure. This structure eliminates the traditional riveting process, thereby avoiding the deformation and positional displacement of the silicon steel sheet 3 caused by local stress during the riveting process, reducing the deviation between the overall axis of the iron core 2 and the axis of the rotating shaft 1, and thus significantly improving the coaxiality of the rotor assembly. Under high-speed conditions, the rotor dynamic balance performance is greatly improved, effectively suppressing vibration and noise caused by unbalanced torque. Moreover, eliminating the riveting process also reduces the production cost of the rotor assembly.

[0026] 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 snap-fit ​​rotor assembly, comprising a shaft (1) and an iron core (2) sleeved on the shaft (1), the iron core (2) being formed by axially stacking silicon steel sheets (3), characterized in that: The outer side of the rotating shaft (1) is provided with a protruding retaining strip (4) that extends axially along the rotating shaft (1). The inner wall of the silicon steel sheet (3) is interference-fitted with the clip (4).

2. The snap-fit ​​rotor assembly according to claim 1, characterized in that: The iron core (2) has baffles (5) that are fitted to the rotating shaft (1) on both sides.

3. The snap-fit ​​rotor assembly according to claim 2, characterized in that: The baffle (5) and the clip (4) are connected by an interference fit.

4. The snap-fit ​​rotor assembly according to claim 3, characterized in that: A boss (6) is provided at the center of the outer side of the baffle (5); The inner wall of the baffle (5) extends to the outer side of the boss (6).

5. The snap-fit ​​rotor assembly according to claim 4, characterized in that: The boss (6) is frustum shaped, and its constricted end is located at the outer end of the boss (6).

6. The snap-fit ​​rotor assembly according to claim 1, characterized in that: The iron core (2) is provided with a radially protruding mounting cylinder (7) in the middle. The card strip (4) is disposed on the outer side of the mounting cylinder (7); The silicon steel sheet (3) and the baffle (5) are fitted into the mounting cylinder (7); The mounting cylinder (7) has external chamfers (8) at both ends.

7. The snap-fit ​​rotor assembly according to claim 1, characterized in that: The thickness of the card strip (4) in the radial direction of the rotating shaft (1) is 0.1-0.15 mm.

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