Cast-aluminum rotor balance plate
By adopting a steel-aluminum combined annular inner and outer plate structure on the motor rotor, combined with limiting and heat dissipation design, the problem of unstable connection caused by the difference in material expansion coefficient of the motor rotor balance plate is solved, and the high strength and heat dissipation efficiency are improved.
Patent Information
- Application Number
- CN202422835989.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-20
- Publication Date
- 2025-12-12
- Estimated Expiration
- 2034-11-20
AI Technical Summary
In the existing technology, the motor rotor balance plate has insufficient connection strength due to the difference in the coefficient of thermal expansion of the materials, which affects the normal operation of the motor, and the thermal expansion and contraction may cause it to loosen.
The system combines a steel inner ring plate with an aluminum outer ring plate, using interference fit and limiting structure to enhance connection stability. Arc-shaped grooves and air ducts are provided on the outer plate to reduce weight and dissipate heat.
It improves the stability and connection strength of the balance plate, prevents rotational deviation, reduces the effects of thermal expansion and contraction, enhances heat dissipation, and extends service life.
Smart Images
Figure CN223666159U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to motor technical field, concretely relates to a cast aluminium rotor balance plate. BACKGROUND
[0002] Currently, new energy vehicles driven by electric energy or driven by a mixture of electric energy and fuel are paid more and more attention. In various new energy vehicles, one or more motors are usually installed. These motors are often integrated with a transmission in an axle.
[0003] The motor has a stator and a rotor capable of relative rotation, wherein the rotor is stacked by a plurality of rotor laminations. In order to adjust the dynamic balance of the rotor, a balance plate needs to be installed at both axial ends of the rotor. Its main function is to effectively control the centrifugal force and vibration generated during the rotation of the rotor by adjusting the mass distribution of the rotor, so as to ensure that the motor can run smoothly and efficiently.
[0004] The balance plate is usually fixed on the radial outer side of the motor shaft by interference fit. Due to the high-speed rotation of the motor, the motor shaft may experience severe temperature changes, which may cause the balance plate to expand and contract significantly, and then cause the balance plate to loosen from the motor shaft. In order to prevent this phenomenon, the balance plate in the prior art uses different materials on the radial inner side and the radial outer side. When the two materials are assembled together, the connection strength is difficult to guarantee, and the different expansion coefficients of the two different materials are easy to cause relative displacement between the structural parts of the two materials, affecting the normal operation of the motor. SUMMARY
[0005] In view of the problems and deficiencies of the prior art, the utility model provides a cast aluminium rotor balance plate, which is characterized by setting a steel annular inner plate and casting an annular outer plate outside the annular inner plate, greatly increasing the firmness of the annular inner plate and the annular outer plate. By opening an arc-shaped groove on the annular outer plate, the weight of the balance plate can be reduced, and the thickness and ring width of the annular outer plate can be reduced, so as to ensure the strength of the cast aluminium during pouring.
[0006] The utility model is implemented by the following technical solutions:
[0007] The application discloses a cast aluminum rotor balance plate for being installed on the axial end of a rotor of an electric machine, and the balance plate comprises an annular inner plate and an annular outer plate. The annular inner plate is sleeved to the radial outer side of the electric machine shaft, the annular inner plate is in interference fit with the electric machine shaft, the annular inner plate is made of steel material, and the influence of thermal expansion and cold shrinkage of the balance plate on the connection stability of the annular inner plate and the electric machine shaft can be effectively reduced. A limiting groove is formed in the middle position of the outer wall of the annular inner plate. The annular outer plate is sleeved to the radial outer side of the annular inner plate, the annular outer plate is made of aluminum material and is cast to the outer side of the annular inner plate in a cast aluminum mode, and the firmness between the annular inner plate and the annular outer plate is greatly strengthened. The inner wall of the annular outer plate protrudes a limiting protrusion which extends into the limiting groove, and the separation of the annular inner plate and the annular outer plate can be effectively prevented. The top surface of the annular outer plate is also provided with a plurality of arc-shaped grooves which are uniformly distributed along the circumferential direction of the annular outer plate, the weight of the balance plate can be reduced, the thickness and ring width of the annular outer plate can be reduced, and the strength of the cast aluminum of the balance plate in the pouring process can be ensured.
[0008] Further, the outer wall of the annular inner plate is also provided with a first limiting plane, the inner wall of the annular outer plate has a second limiting plane matched with the first limiting plane, and the rotation deviation of the annular inner plate relative to the annular outer plate can be effectively prevented.
[0009] Further, the bottom wall of the annular outer plate has an inwardly protruding bearing ring wall, the bottom wall of the annular inner plate abuts to the bearing ring wall, the contact area between the annular outer plate and the annular inner plate is increased, and the connection strength between the annular inner plate and the annular outer plate is further increased.
[0010] Further, the outer wall of the annular outer plate is in the shape of a circular truncated cone, and the corners of the outer wall of the annular outer plate are chamfered, so that the balance plate is more convenient for assembling the rotor after being matched with the rotor.
[0011] Further, the corners of the arc-shaped grooves are chamfered, so that the balance plate is more convenient for assembling the rotor after being matched with the rotor.
[0012] Further, the annular outer plate is also provided with air guide holes, and the air inlets and air outlets of the air guide holes are located on the outer wall of the annular outer plate, so that the influence of the heat of the annular outer plate on the structure of the annular outer plate can be reduced, and the heat dissipation of the annular outer plate can be facilitated.
[0013] Further, the annular outer plate is provided with a plurality of air guide holes, and the air guide holes are uniformly distributed along the circumferential direction of the annular outer plate, so that the balance of the annular outer plate during rotation can be ensured.
[0014] Further, the shortest distance from the air guide holes to the center of the annular outer plate is greater than the farthest distance from the arc-shaped grooves to the center of the annular outer plate, so that the basic structural strength of the annular outer plate can be maintained.
[0015] Further, the minimum inner diameter of the annular outer plate is greater than the minimum inner diameter of the annular inner plate, so that the annular outer plate can not directly abut to the electric machine shaft.
[0016] Further, the depth of the arc-shaped groove is less than or equal to half of the thickness of the annular outer plate, thereby ensuring the basic structural strength of the annular outer plate.
[0017] The utility model discloses the beneficial effect of:
[0018] 1. By setting up steel annular inner plate and setting up annular outer plate on the outside of annular inner plate cast aluminum, greatly increase the firm type of annular inner plate and annular outer plate,
[0019] 2. By setting up arc-shaped groove on the annular outer plate, can reduce the weight of the balance plate, can also reduce the thickness and ring width of the annular outer plate, ensure the strength of cast aluminum of balance plate in the process of pouring;
[0020] 3. The second limiting plane that the first limiting plane of annular inner plate cooperated is equipped with on the annular outer plate, effectively prevent the rotation deviation of annular outer plate relative to annular inner plate;
[0021] 4. The wind guide hole is set up in the annular outer plate, reduces the influence of the heat of balance plate operating process to the structural strength of balance plate. DRAWINGS
[0022] Figure 1 To explain the structure schematic diagram of one kind of cast aluminum rotor balance plate in the utility model discloses one kind of schematic implementation mode;
[0023] Figure 2 To explain the structure schematic diagram of one kind of cast aluminum rotor balance plate in the utility model discloses one kind of schematic implementation mode;
[0024] Figure 3 To explain Figure 2 The local amplification schematic diagram in A of in;
[0025] Figure 4 To explain the overhead sectional view of one kind of cast aluminum rotor balance plate in the utility model discloses one kind of schematic implementation mode;
[0026] Figure 5 To explain the front view sectional view of one kind of cast aluminum rotor balance plate in the utility model discloses one kind of schematic implementation mode;
[0027] Figure 6 To explain the structure schematic diagram of the annular outer plate of one kind of cast aluminum rotor balance plate in the utility model discloses one kind of schematic implementation mode;
[0028] Figure 7 To explain the structure schematic diagram of the annular inner plate of one kind of cast aluminum rotor balance plate in the utility model discloses one kind of schematic implementation mode.
[0029] Parts and figure mark list:
[0030] 1, annular inner plate; 11, limiting groove; 12, first limiting plane; 2, annular outer plate; 21, limiting protrusion; 22, arc-shaped groove; 23, second limiting plane; 24, bearing ring wall; 25, rounded corner; 26, air guide hole. DETAILED DESCRIPTION
[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work belong to the scope of protection of the present application.
[0032] It should be noted that the left, right, up, down, front, back and other orientation terms in the embodiments of the present application are only relative concepts or are referenced to the normal use state of the product, i.e., the direction of the product, and should not be considered as having limitations.
[0033] In addition, it should also be noted that the dynamic terms such as "relative motion" mentioned in the embodiments of the present application not only include positional changes, but also include movements in which the position does not change relatively, but the state changes, such as rotation and rolling.
[0034] Finally, it should be noted that when a component is referred to as "located" or "disposed" on another component, it can be on the other component or can exist simultaneously with a centering component. When a component is referred to as "connected to" another component, it can be directly connected to the other component or can exist simultaneously with a centering component.
[0035] For example, Figures 1 to 7The illustrated cast aluminum rotor balance plate is used for installation on the axial end of the rotor of an electric machine, and the balance plate comprises an annular inner plate 1 and an annular outer plate 2. The annular inner plate 1 is sleeved to the radial outer side of the electric machine shaft, the annular inner plate 1 is in interference fit with the electric machine shaft, the annular inner plate 1 is made of steel material, and the influence of thermal expansion and contraction of the balance plate on the connection stability of the annular inner plate 1 and the electric machine shaft can be effectively reduced. A limiting groove 11 is formed in the middle position of the outer wall of the annular inner plate 1. The annular outer plate 2 is sleeved to the radial outer side of the annular inner plate 1, the annular outer plate 2 is made of aluminum material and is cast to the outer side of the annular inner plate 2 by cast aluminum, and the firmness between the annular inner plate 1 and the annular outer plate 2 is greatly strengthened. The inner wall of the annular outer plate 2 protrudes a limiting protrusion 21 which extends into the limiting groove 11, and the separation of the annular inner plate 1 and the annular outer plate 2 is effectively prevented. The top surface of the annular outer plate 2 is also provided with a plurality of arc-shaped grooves 22, which are uniformly distributed along the circumferential direction of the annular outer plate 2, which can not only reduce the weight of the balance plate, but also reduce the thickness and ring width of the annular outer plate 2, and ensure the strength of the cast aluminum of the balance plate during the pouring process.
[0036] In an embodiment, when the balance plate is prepared, first, the annular inner plate 1 made of steel structure is prepared, then the annular inner plate 1 is placed in the mold, and the aluminum liquid is poured into the mold to cast the annular outer plate 2 on the outer side of the annular inner plate 1, thereby forming the preparation of the balance plate. By casting aluminum on the outer side of the annular inner plate 1, the fastening type of the connection of the two materials is greatly improved. A plurality of arc-shaped grooves 22 are formed on the annular outer plate 2 to reduce the weight of the annular outer plate 2 and reduce the production cost of the balance plate. By setting the arc-shaped grooves 22, the anti-deformation ability of the annular outer plate 2 when heated and deformed is increased.
[0037] In an embodiment, the outer side of the prepared annular inner plate 1 has a limiting groove 11 in the form of a ring, the inner wall of the annular outer plate 2 has a limiting protrusion 21 matched with the limiting groove 11, and the limiting protrusion 21 is inserted into the limiting groove 11, so that the annular inner plate 1 and the annular outer plate 2 form an integral whole, avoiding the separation of the annular inner plate 1 and the annular outer plate 2.
[0038] Preferably, the outer wall of the annular inner plate 1 is also provided with a first limiting plane 12, and the inner wall of the annular outer plate 2 has a second limiting plane 23 matched with the first limiting plane 12, which effectively prevents the annular inner plate 1 from rotating and deviating relative to the annular outer plate 2.
[0039] Preferably, the bottom wall of the annular outer plate 2 has a bearing ring wall 24 protruding inward, and the bottom wall of the annular inner plate 1 abuts against the bearing ring wall 24, thereby increasing the contact area between the annular outer plate 2 and the annular inner plate 1, and further increasing the connection strength between the annular inner plate 1 and the annular outer plate 2.
[0040] In an embodiment, in order to prevent the rotation deviation of the annular outer plate 2 relative to the annular inner plate 1 when the motor is running at high speed, an inwardly protruding bearing ring wall 24 is arranged at the bottom of the annular outer plate 2, and the bearing ring wall 24 is in abutment with the bottom wall of the annular inner plate 1, thereby greatly increasing the total contact area of the annular inner plate 1 and the annular outer plate 2, and further increasing the stability of the connection between the two.
[0041] Preferably, the outer wall of the annular outer plate 2 is in the shape of a circular truncated cone, and a rounded corner 25 is arranged at the corner of the outer wall of the annular outer plate 2, so that after the balancing plate is matched with the rotor, the assembly of the rotor is more convenient.
[0042] Preferably, a rounded corner 25 is arranged at the corner of the arc-shaped groove 22, so that after the balancing plate is matched with the rotor, the assembly of the rotor is more convenient.
[0043] In an embodiment, the rounded corners 25 are arranged at the corner of the outer wall of the annular outer plate 2 and the corner of the arc-shaped groove 22, which can also avoid stress concentration of the balancing plate and improve the service life of the balancing plate.
[0044] Preferably, the annular outer plate 2 is further provided with air guide holes 26, and the air inlet and air outlet of the air guide holes 26 are located on the outer wall of the annular outer plate 2, which can not only reduce the influence of the heat of the annular outer plate 2 on the structure of the annular outer plate 2, but also facilitate the heat dissipation of the annular outer plate 2.
[0045] In an embodiment, when the balancing plate rotates at high speed with the rotor, external airflow flows into the air guide holes 26 through the air inlets, and then flows out of the external environment through the air outlets of the air guide holes 26. Thus, an airflow channel is formed in the inside of the balancing plate, which can effectively cool the balancing plate and improve the service life of the balancing plate.
[0046] Preferably, a plurality of air guide holes 26 are arranged in the inside of the annular outer plate 2, and the air guide holes 26 are uniformly distributed along the circumferential direction of the annular outer plate 2, so as to ensure the balance of the annular outer plate 2 when rotating.
[0047] Preferably, the shortest distance from the air guide holes 26 to the center of the annular outer plate 2 is greater than the farthest distance from the arc-shaped groove 22 to the center of the annular outer plate 2, so as to maintain the basic structural strength of the annular outer plate 2 and avoid the air guide holes 26 and the arc-shaped groove 22 being communicated, which affects the structural strength of the annular outer plate 2.
[0048] Preferably, the minimum inner diameter of the annular outer plate 2 is greater than the minimum inner diameter of the annular inner plate 1, so as to avoid the annular outer plate 2 directly abutting against the motor shaft.
[0049] Preferably, the depth of the arc-shaped groove 22 is less than or equal to half of the thickness of the annular outer plate 2, so as to ensure the basic structural strength of the annular outer plate 2.
[0050] When the above-mentioned cast aluminum rotor balance plate is used, the firmness of the annular inner plate 1 and the annular outer plate 2 is greatly increased by arranging the annular inner plate 1 made of steel and the annular outer plate 2 made of cast aluminum outside the annular inner plate 1. By arranging the arc-shaped grooves 22 on the annular outer plate 2, the weight of the balance plate can be reduced, and the thickness and the ring width of the annular outer plate 2 can be reduced, so that the strength of the cast aluminum during the pouring process can be ensured.
[0051] The above only describes the embodiments of the present application and is not intended to limit the present application. Various modifications and changes can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the scope of the claims of the present application.
Claims
1. A cast aluminum rotor balance plate for mounting on the axial end of a motor rotor, characterized in that, The balance plate includes: An annular inner plate is fitted onto the radial outer side of the motor shaft. The annular inner plate is interference-fitted with the motor shaft. The annular inner plate is made of steel. A limit groove is formed in the middle of the outer wall of the annular inner plate. An annular outer plate is fitted onto the radially outer side of the annular inner plate. The annular outer plate is made of aluminum and is cast onto the outer side of the annular inner plate by aluminum casting. The inner wall of the annular outer plate has a limiting protrusion that extends into the limiting groove. The top surface of the annular outer plate is also provided with several arc-shaped grooves, which are evenly distributed along the circumferential direction of the annular outer plate.
2. The cast aluminum rotor balance plate according to claim 1, characterized in that, The outer wall of the annular inner plate is further provided with a first limiting plane, and the inner wall of the annular outer plate has a second limiting plane that cooperates with the first limiting plane.
3. The cast aluminum rotor balance plate according to claim 1, characterized in that, The bottom wall of the annular outer plate has an inwardly protruding bearing ring wall, and the bottom wall of the annular inner plate abuts against the bearing ring wall.
4. The cast aluminum rotor balance plate according to claim 1, characterized in that, The outer wall of the annular outer plate is shaped like a frustum, and the corners of the outer wall of the annular outer plate are rounded.
5. A cast aluminum rotor balance plate according to claim 1, characterized in that, The corners of the arc-shaped groove are rounded.
6. A cast aluminum rotor balance plate according to claim 1, characterized in that, The annular outer plate is also provided with air guide holes, and the air inlet and outlet of the air guide holes are both located on the outer wall of the annular outer plate.
7. A cast aluminum rotor balance plate according to claim 6, characterized in that, The annular outer plate has multiple air guide holes inside, and each air guide hole is evenly distributed along the circumferential direction of the annular outer plate.
8. A cast aluminum rotor balance plate according to claim 7, characterized in that, The shortest distance from the air guide hole to the center of the annular outer plate is greater than the farthest distance from the arc-shaped groove to the center of the annular outer plate.
9. A cast aluminum rotor balance plate according to claim 1, characterized in that, The minimum inner diameter of the outer annular plate is greater than the minimum inner diameter of the inner annular plate.
10. A cast aluminum rotor balance plate according to claim 1, characterized in that, The depth of the arc-shaped groove is less than or equal to half the thickness of the annular outer plate.