A new rotor structure

Abstract

The utility model discloses a novel rotor structure, including the pivot, the rotor core of being located on the pivot and the first pressure ring and the second pressure ring of being located at the both ends of rotor core, first pressure ring is located at the transmission input end of rotor, and is positioned by the shoulder of pivot, second pressure ring is located at the dynamic balance calibration end of rotor, second pressure ring includes the outer aluminum ring and the inner steel ring of nested connection, the inner steel ring is with the interference fit of pivot. The utility model has compact structure, convenient to dismount, reliability higher characteristics, both are favorable to the axial space of rotor reduction, can satisfy the strength demand of rotor dynamic balance calibration.

Description

Technical Field

[0001] This utility model relates to the field of drive motor technology, and specifically to a novel rotor structure. Background Technology

[0002] Currently, the rotor structure of passenger car motors mainly consists of a shaft, pressure rings, a rotor core, and a round nut or heated collar. Dynamic balancing of the rotor is mostly performed by drilling holes in the pressure rings on both sides of the rotor core. These pressure rings are often made of aluminum. If non-magnetic materials such as stainless steel or copper are used for the pressure rings, the debalancing head will wear severely, resulting in high manufacturing costs. Furthermore, stainless steel and copper are also expensive materials; therefore, aluminum pressure rings are more commonly used. Aluminum has relatively low strength, and an interference fit between the aluminum pressure ring and the shaft cannot prevent circumferential rotation and axial movement of the pressure ring. Therefore, a keyway fit is often used between the aluminum pressure ring and the shaft to prevent circumferential rotation of the pressure ring during rotor rotation. In the axial direction of the rotor, a clearance fit is often used between the inner diameter of the pressure ring and the outer diameter of the shaft, which cannot prevent axial movement. Therefore, a round nut or heated collar is used to axially fix the rotor core and pressure ring to prevent axial movement of the pressure ring on the shaft. With the development of high-speed, high-power-density, and highly integrated motors, existing solutions will have the following problems: (1) High integration makes the axial space requirement of the rotor increasingly shorter. The round nut or hot ring will occupy part of the axial space on the rotor, making it impossible to further compress the axial space of the motor.

[0003] (2) If stainless steel or copper pressure rings are used, the material cost and manufacturing cost of the rotor will increase.

[0004] (3) As the power density of motors increases, both the stator and rotor require direct oil cooling. The rotor throws oil through the oil holes on the shaft to cool the inner circle of the stator end. The presence of round nuts or heat-retaining rings means that the location of the oil holes on the shaft must avoid the round nuts or heat-retaining rings. The location of the oil holes causes the oil to be thrown outside the stator end, failing to cool the stator end. Therefore, oil holes need to be made on the dynamic balancing plate so that the oil enters the dynamic balancing plate from the oil holes on the shaft and is then thrown to the stator end, resulting in higher processing costs for the dynamic balancing plate.

[0005] (4) When assembling the rotor, the dynamic balance plate needs to be assembled first, and then the round nut or heat-shrink ring needs to be assembled. This increases the number of assembly steps and is not conducive to improving production efficiency. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a novel rotor structure that is compact, easy to assemble and disassemble, and stable and reliable, in order to address the shortcomings of the existing technology.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: A novel rotor structure includes a rotating shaft, a rotor core mounted on the rotating shaft, and a first pressure ring and a second pressure ring located at both ends of the rotor core. The first pressure ring is located at the transmission input end of the rotor and is positioned by a shoulder of the rotating shaft. The second pressure ring is located at the dynamic balance calibration end of the rotor. The second pressure ring includes an outer aluminum ring and an inner steel ring nested together, and the inner steel ring is interference-fitted with the rotating shaft.

[0008] As a further improvement of this utility model, the rotating shaft is provided with an oil passage, and multiple oil injection holes are provided at both ends of the oil passage. The oil injection holes at both ends of the oil passage are located outside the first pressure ring and the second pressure ring, so as to realize that the oil in the oil passage is sprayed to the end of the motor stator winding through the oil injection holes.

[0009] As a further improvement of this utility model, the inner circle of the outer aluminum ring is provided with a boss, and the outer circle of the inner steel ring is provided with a groove. The boss and the groove are matched to achieve axial compression of the outer aluminum ring by the inner steel ring.

[0010] As a further improvement of this utility model, the tail of the inner steel ring is located inside the outer aluminum ring.

[0011] As a further improvement of this utility model, the top of the groove of the inner steel ring is provided with multiple first tangential surfaces along the circumferential direction to prevent circumferential displacement between the outer aluminum ring and the inner steel ring.

[0012] As a further improvement of this utility model, the top of the groove of the inner steel ring is provided with a plurality of semi-circular grooves along the circumferential direction to prevent circumferential displacement between the outer aluminum ring and the inner steel ring.

[0013] As a further improvement of this utility model, the bottom of the groove of the inner steel ring is provided with multiple second tangential surfaces along the circumferential direction to prevent circumferential displacement between the outer aluminum ring and the inner steel ring.

[0014] As a further improvement of this utility model, the first pressure ring is made of aluminum.

[0015] As a further improvement of this utility model, the inner steel ring is made of magnetically conductive steel.

[0016] As a further improvement of this utility model, the diameter of the inner steel ring is smaller than the diameter of the rotor core.

[0017] Compared with the prior art, the advantages of this utility model are: The novel rotor structure of this utility model consists of a second pressure ring formed by nested outer aluminum ring and inner steel ring. The second pressure ring is placed at the dynamic balance calibration end of the rotor. The inner steel ring is interference-fitted with the shaft, which not only achieves a stable connection between the second pressure ring, the shaft, and the rotor core, but also meets the strength requirements for dynamic balance calibration of the rotor. Furthermore, it helps to reduce the axial space of the rotor and significantly reduces the manufacturing cost of the rotor. Attached Figure Description

[0018] Figure 1 This is a schematic diagram illustrating the structural principle of the novel rotor structure in a specific embodiment of this utility model; Figure 2 This is a schematic diagram of the cross-sectional structure of the second pressure ring in specific embodiment 1 of this utility model; Figure 3 This is a schematic diagram of the structural principle of the second pressure ring in specific embodiment 1 of this utility model; Figure 4 This is a schematic diagram of the structural principle of the second pressure ring in specific embodiment 2 of this utility model; Figure 5 for Figure 4 Schematic diagram of the structural principle of the cross-section along the AA direction; Figure 6 This is a schematic diagram of the structural principle of the second pressure ring in specific embodiment 3 of this utility model; Figure 7 for Figure 6 A schematic diagram of the structural principle of the cross-section along the BB direction.

[0019] Legend: 1. Shaft; 11. Oil passage; 12. Oil injection hole; 13. Shoulder; 2. Rotor core; 3. First pressure ring; 4. Second pressure ring; 41. Outer aluminum ring; 411. Boss; 42. Inner steel ring; 421. Groove; 422. First cut surface; 423. Semicircular groove; 424. Second cut surface. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and specific preferred embodiments, but this does not limit the scope of protection of the present invention.

[0021] In the description of this utility model, it should be understood that the terms "side", "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "multiple" means two or more, unless otherwise explicitly specified.

[0023] Example 1 like Figure 1 , Figure 2 and Figure 3 As shown, the novel rotor structure of this utility model includes a rotating shaft 1, a rotor core 2 mounted on the rotating shaft 1, and a first pressure ring 3 and a second pressure ring 4 located at both ends of the rotor core 2. The first pressure ring 3 is made of aluminum and is located at the transmission input end of the rotor, positioned by a shoulder 13 of the rotating shaft 1, so that the first pressure ring 3 presses against the rotor core 2. The second pressure ring 4 is located at the dynamic balance calibration end of the rotor. The second pressure ring 4 includes an outer aluminum ring 41 and an inner steel ring 42 nested together. The inner steel ring 42 is interference-fitted with the rotating shaft 1 to provide axial preload and press against the rotor core 2.

[0024] like Figure 1 As shown, the diameter of the inner steel ring 42 is smaller than the diameter of the rotor core 2, and the tail of the inner steel ring 42 is located inside the outer aluminum ring 41. This satisfies the strength requirements for dynamic balancing of the rotor while reducing the axial length of the rotor. Specifically, the inner steel ring 42 can be made of magnetically conductive 45# steel to reduce costs.

[0025] In this embodiment, the second pressure ring 4 is formed by the nested outer aluminum ring 41 and inner steel ring 42, and the second pressure ring 4 is set at the dynamic balance calibration end of the rotor. The inner steel ring 42 is interference-fitted with the rotating shaft 1, which not only achieves a stable connection between the second pressure ring 4, the rotating shaft 1 and the rotor core 2, but also meets the strength requirements for the dynamic balance calibration of the rotor, and also helps to reduce the axial space of the rotor, significantly reducing the manufacturing cost of the rotor.

[0026] like Figure 1 As shown, the rotating shaft 1 has an oil passage 11 inside, and multiple oil injection holes 12 are provided at both ends of the oil passage 11. The oil injection holes 12 at both ends of the oil passage 11 are located outside the first pressure ring 3 and the second pressure ring 4, so that the oil in the oil passage 11 can be sprayed to the end of the motor stator winding through the oil injection holes 12 to improve the motor cooling efficiency. Moreover, the oil injection holes 12 are directly opened on the rotating shaft 1, which makes the manufacturing process simpler and the cost lower.

[0027] like Figure 2As shown, the inner circle of the outer aluminum ring 41 has a boss 411, and the outer circle of the inner steel ring 42 has a groove 421. Through the cooperation between the boss 411 and the groove 421, the inner steel ring 42 can axially press the outer aluminum ring 41, improving the connection stability between the outer aluminum ring 41 and the inner steel ring 42 and preventing the outer aluminum ring 41 from axially loosening. By first assembling the outer aluminum ring 41 and the inner steel ring 42 into a single unit and then installing it onto the rotor, assembly steps can be saved.

[0028] like Figure 3 As shown, the top of the groove 421 of the inner steel ring 42 is symmetrically provided with two straight first cut surfaces 422 along the circumferential direction to prevent circumferential displacement between the outer aluminum ring 41 and the inner steel ring 42 caused by the high-speed rotation of the rotor.

[0029] Example 2 like Figure 4 and Figure 5 As shown, the novel rotor structure of this embodiment has a similar structural setting and working principle to the novel rotor structure in embodiment 1. The main difference is that the top of the groove 421 of the inner steel ring 42 is symmetrically provided with four semi-circular grooves 423 along the circumferential direction, which can also prevent circumferential displacement between the outer aluminum ring 41 and the inner steel ring 42 caused by the high-speed rotation of the rotor.

[0030] Example 3 like Figure 6 and Figure 7 As shown, the novel rotor structure of this utility model, the novel rotor structure of this embodiment, has a similar structural setting and working principle to the novel rotor structure in embodiment 1. The main difference is that: the bottom of the groove 421 of the inner steel ring 42 is symmetrically provided with four straight second cut surfaces 424 along the circumferential direction, which can also prevent the circumferential displacement between the outer aluminum ring 41 and the inner steel ring 42 caused by the high-speed rotation of the rotor.

[0031] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A novel rotor structure, characterized in that, It includes a rotating shaft (1), a rotor core (2) mounted on the rotating shaft (1), and a first pressure ring (3) and a second pressure ring (4) mounted at both ends of the rotor core (2). The first pressure ring (3) is located at the transmission input end of the rotor and is positioned by the shoulder (13) of the rotating shaft (1). The second pressure ring (4) is located at the dynamic balance calibration end of the rotor. The second pressure ring (4) includes an outer aluminum ring (41) and an inner steel ring (42) nested together. The inner steel ring (42) is interference-fitted with the rotating shaft (1).

2. The novel rotor structure according to claim 1, characterized in that, The rotating shaft (1) is provided with an oil passage (11) inside. Multiple oil injection holes (12) are provided at both ends of the oil passage (11). The oil injection holes (12) at both ends of the oil passage (11) are located outside the first pressure ring (3) and the second pressure ring (4) so ​​as to realize that the oil in the oil passage (11) is sprayed to the end of the motor stator winding through the oil injection holes (12).

3. The novel rotor structure according to claim 1, characterized in that, The inner circle of the outer aluminum ring (41) is provided with a boss (411), and the outer circle of the inner steel ring (42) is provided with a groove (421). The boss (411) and the groove (421) are matched to achieve the axial pressing of the inner steel ring (42) against the outer aluminum ring (41).

4. The novel rotor structure according to claim 3, characterized in that, The tail of the inner steel ring (42) is located inside the outer aluminum ring (41).

5. The novel rotor structure according to claim 4, characterized in that, The inner steel ring (42) has multiple first cut surfaces (422) on the top of the groove (421) along the circumferential direction to prevent circumferential displacement between the outer aluminum ring (41) and the inner steel ring (42).

6. The novel rotor structure according to claim 4, characterized in that, The inner steel ring (42) has a plurality of semi-circular grooves (423) on the top of the groove (421) along the circumferential direction to prevent circumferential displacement between the outer aluminum ring (41) and the inner steel ring (42).

7. The novel rotor structure according to claim 4, characterized in that, The bottom of the groove (421) of the inner steel ring (42) is provided with a plurality of second cut surfaces (424) along the circumferential direction to prevent circumferential displacement between the outer aluminum ring (41) and the inner steel ring (42).

8. The novel rotor structure according to any one of claims 1 to 7, characterized in that, The first pressure ring (3) is made of aluminum.

9. The novel rotor structure according to any one of claims 1 to 7, characterized in that, The inner steel ring (42) is made of magnetically conductive steel.

10. The novel rotor structure according to any one of claims 1 to 7, characterized in that, The diameter of the inner steel ring (42) is smaller than the diameter of the rotor core (2).

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