External rotor motor rotor impeller tooling

Abstract

This utility model discloses a rotor impeller pressing fixture for an external rotor motor, relating to the field of assembly fixtures. Specifically, it includes an impeller positioning component and a rotor positioning component coaxially embedded therein. A spring-loaded limiting rod passes through both components, with the spring providing elastic support to the bottom surface of the rotor positioning component. The inner diameter of the first cavity of the impeller positioning component is larger than the outer diameter of the rotor positioning component, creating a pre-reserved gap for impeller insertion. Above the rotor positioning component, a motor rotor and an upper pressing head with an adapter hole are sequentially arranged. Compared to existing technologies, the pre-reserved gap formed by the difference in outer diameter between the upper cavity of the impeller positioning component and the rotor positioning component accommodates impellers of different specifications. The rotor positioning component, in conjunction with the spring-loaded limiting rod, is compatible with motor rotors of different heights, allowing the same fixture to accommodate rotors of different heights and impellers of different specifications with the same rotor outer diameter. Furthermore, after pressing, the rotor positioning component, under the action of the spring, pushes the pressed assembly out of the fixture together, eliminating the need for manual removal and simplifying the operation.

Description

Technical Field

[0001] This utility model relates to an assembly fixture, specifically an external rotor motor rotor impeller fixture. Background Technology

[0002] In external rotor motors, the quality of the press-fitting of the rotor and impeller directly affects the motor's operational stability, vibration noise, and service life. Therefore, during the assembly process of the rotor and impeller, it is necessary to ensure the concentricity, perpendicularity, and relative press-fitting position accuracy of the two components. At the same time, the tooling must be easy to operate, highly adaptable, and have high production efficiency.

[0003] Chinese utility model patent CN221538785U discloses a rotor impeller pressing device specifically for pressing rotor housings and impeller flanges. However, it limits the pressing stroke by the relative position of the mold sleeve and the base, making it impossible to flexibly adjust the relative pressing position of the rotor and impeller. If the assembly depth needs to be changed, the tooling must be disassembled and the limiting structure readjusted, which is cumbersome and difficult to guarantee accuracy. When changing specifications, the mold calibration process is cumbersome and can easily affect assembly accuracy. Furthermore, the workpiece must be manually removed after pressing, lacking a convenient automatic part removal design, thus reducing production efficiency.

[0004] Therefore, in view of the problems of poor versatility, narrow range of application, inconvenient position adjustment and complicated mold changing of existing tooling, there is an urgent need for an external rotor motor rotor impeller pressing tooling that can adapt to various rotor heights and impeller specifications, flexibly adjust the relative pressing position and is easy to operate, so as to improve production efficiency and product quality stability. Summary of the Invention

[0005] The purpose of this invention is to provide a rotor impeller pressing fixture for an external rotor motor. A single fixture can accommodate combinations of rotors with different heights and impeller specifications for the same rotor outer diameter, without requiring replacement of fixture components. Through parameter settings and the adaptive elastic structure, it can cover multiple specification combinations for pressing, solving the problems of poor versatility and complex mold changes in existing fixtures. Another objective of this invention is that after pressing, the rotor positioning component, under the action of a spring, pushes the impeller and rotor assembly out of the fixture together, eliminating the need for manual removal, simplifying operation, and improving production efficiency.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a rotor impeller pressing fixture for an external rotor motor, comprising an impeller positioning component, a rotor positioning component coaxially embedded therein, and a limiting rod with a spring passing through both, the spring elastically supporting the bottom surface of the rotor positioning component; the inner diameter of the upper cavity of the impeller positioning component is larger than the outer diameter of the rotor positioning component, forming a reserved gap for inserting the impeller; a motor rotor and an upper pressing head with an adapter hole are sequentially arranged above the rotor positioning component. The impeller positioning component and the rotor positioning component adopt a coaxial embedded design, ensuring the radial concentricity of the impeller and the motor rotor from the structural root; the spring and the limiting rod cooperate to achieve elastic support and precise positioning of the rotor positioning component, adapting to rotors of different heights; the spring can provide energy for reset after pressing and can also buffer during the pressing process; the annular gap of the upper cavity, due to its large inner diameter, does not participate in the radial constraint of the rotor positioning component, but is only used to accommodate multiple impellers; the adapter hole adapts to different rotors; the whole assembly does not require replacement of parts, adapts to multiple specifications, is easy to operate, and improves versatility and efficiency.

[0007] Preferably, the springs are distributed along the limiting rod and pass through the impeller positioning component. Cooperating with the limiting rod, the springs control the upper plane of the rotor positioning component to be higher than the upper plane of the impeller positioning component by a preset height. A pre-reserved gap is provided to accommodate the impeller's bushing, allowing the bushing to slide against the inner wall of the upper cavity. The impeller slides against the impeller positioning component via the bushing using an insertion method, facilitating the spring's ejection of the impeller from the tooling after press-fitting. The pre-reserved gap and bushing fit allow for compatibility with various impeller bushing specifications, enabling seamless adaptation to multiple combinations and improving tooling versatility and press-fitting accuracy. The springs and limiting rods work together to elastically support rotors of different heights while precisely controlling the preset height, ensuring a fixed initial assembly position for different specification combinations without manual adjustment. The annular gap, combined with the design of the rotor positioning component's upper plane being higher than the impeller positioning component's upper plane by a preset height, allows the bushing to be pre-positioned outside the rotor positioning component without radial interference.

[0008] Preferably, the central cavity of the impeller positioning component forms a clearance fit with the rotor body of the motor rotor, while the inner diameter of the lower cavity matches the outer diameter of the rotor positioning component, forming a sliding fit. The clearance fit between the central cavity and the rotor body prevents radial interference between the motor rotor and the impeller positioning component. Simultaneously, the inner wall of the central cavity still provides radial restraint to the rotor body, ensuring coaxiality between the rotor and the tooling, avoiding misalignment due to height differences, and guaranteeing stable press-fit concentricity. The sliding fit between the lower cavity and the rotor positioning component provides precise guidance and sliding support, ensuring accurate axial sliding without misalignment, and guaranteeing press-fit concentricity. The combination of these two features allows for adaptation to rotors of various heights without component replacement, while maintaining stable press-fit accuracy and improving the tooling's versatility and reliability.

[0009] Preferably, the impeller positioning support at the lower end of the impeller positioning component has three axially through holes evenly distributed along its circumference to accommodate the limiting rod and the spring. The three axially through holes evenly distributed along the circumference of the impeller positioning support can precisely accommodate the limiting rod and the spring. This symmetrical distribution ensures balanced support force, preventing the rotor positioning component from tilting, and, in conjunction with the limiting rod, limits the radial deformation of the spring during compression and reset, preventing lateral bending of the spring due to uneven force distribution. This ensures stable axial transmission of the spring force and guarantees the force balance of the rotor positioning component.

[0010] Preferably, the upper end of the rotor positioning component has a top cavity for accommodating the rotor heads of different types of motor rotors. The peripheral wall of the top cavity fits with the main body of the motor rotor to form a support. The top cavity at the upper end of the rotor positioning component can not only accommodate the rotor heads of different types of motor rotors and adapt to various rotor structures, but also form a stable support through the fit between the peripheral wall and the rotor body, ensuring that the rotor is subjected to balanced force and does not skew during press-fitting. This improves the versatility of the tooling while ensuring press-fitting stability and accuracy.

[0011] Preferably, the lower end of the top cavity has a central hollow cylinder; several guide holes are evenly distributed around the lower end in a circular pattern, and the bottom of the guide holes has a limiting step that cooperates with the limiting rod. The central hollow cylinder at the lower end of the top cavity can reduce the weight of the rotor positioning component, reduce material consumption and processing costs, and improve the flexibility of the tooling operation; the evenly distributed guide holes provide a precise guiding channel for the limiting rod, and the bottom limiting step cooperates with the limiting rod to stably limit the stroke of the positioning component. The combination of these three features not only ensures sliding accuracy, but also improves the reliability and versatility of the tooling through standardized fitting and multi-specification press-fitting.

[0012] Preferably, the limiting rod has a limiting head at the top and a reduced-diameter section at the bottom, with an internally threaded hole machined inside the reduced-diameter section. The limiting head at the top of the limiting rod can precisely engage with the limiting step of the rotor positioning component, stably limiting the positioning stroke and preventing the rotor positioning component from dislodging from the fixture when it resets under the action of the spring, thus improving the safety of the fixture. The reduced-diameter section at the bottom of the limiting rod is specially designed for insertion into the base plate, enabling quick positioning and assembly with the base plate and ensuring the coaxiality of the limiting rod installation. The internally threaded hole inside the reduced-diameter section further rigidly fixes it to the base plate, strengthening the connection stability. Simultaneously, the reduced-diameter section reduces the bottom size, decreasing the mating area with the base plate, facilitating quick insertion and removal, reducing assembly tolerance requirements, and improving the assembly efficiency and structural reliability of the fixture.

[0013] Preferably, the upper pressure head contains a hollow cylinder connected to the hydraulic press. The outer radial end wall of the hollow cylinder has a through bolt groove perpendicular to its radial direction. The adapter hole diameter is larger than that of the hollow cylinder, allowing for the adaptation of different types of motor rotors. The hollow cylinder connected to the hydraulic press provides a stable structure for power transmission and reduces weight and energy consumption through its hollow design. The through bolt groove on the outer radial end wall of the hollow cylinder is perpendicular to the radial direction, facilitating quick bolt fixing of the hollow cylinder to external components. The bolt connection position is flexible, allowing adjustment of the fixing point according to assembly requirements, enhancing the adaptability of the connection. The adapter hole diameter is larger than that of the hollow cylinder, enabling compatibility with motor rotors of different diameters, eliminating the need for frequent pressure head replacements and significantly improving versatility for various rotor types.

[0014] Preferably, the base plate is provided with mounting holes for mates with the impeller positioning component and positioning holes for mates with the limiting rod. The mounting holes for the impeller positioning component enable rapid alignment and installation, ensuring its fixed position accuracy on the base plate and laying the foundation for stable impeller positioning. The positioning holes for the limiting rod allow precise insertion into the reduced-diameter section at the bottom of the limiting rod, ensuring the perpendicularity and coaxiality of the limiting rod installation and preventing press-fit deviations caused by the limiting rod's misalignment. These two types of holes correspond to the impeller positioning component and the limiting rod, respectively, enabling zoned positioning of each component on the base plate, reducing assembly interference, ensuring the positioning accuracy and assembly coordination of each component, and improving tooling assembly efficiency and press-fit stability.

[0015] Preferably, the impeller positioning component is fixed to the base plate via evenly distributed mounting through holes on the bottom widening ring. The widening ring increases the contact area between the impeller positioning component and the base plate, improving installation stability; the evenly distributed through holes allow for symmetrical force fixation via bolts or other connectors, preventing the positioning component from tilting due to uneven force and ensuring impeller positioning accuracy; simultaneously, the standardized through hole design facilitates quick alignment and installation, adapts to corresponding mounting holes on the base plate, and improves assembly efficiency and structural reliability.

[0016] The beneficial effects of this utility model are as follows:

[0017] It is highly versatile. For rotors with different heights and the same outer diameter, the height difference is compensated by the adaptive deformation of the spring and the adjustable stroke of the hydraulic press, so that the pressing can be completed without changing the tooling.

[0018] It is easy to operate and does not require structural adjustments due to changes in rotor height or impeller specifications. Pressing can be completed simply by adjusting the parameters of the hydraulic press, reducing mold changing and calibration time, lowering operational complexity, and improving batch production efficiency.

[0019] The relative position of the rotor and impeller is flexibly adjustable to meet the personalized requirements of different products for assembly depth and axial clearance, thereby improving the compatibility of product design.

[0020] With stable precision, the coaxial constraint design ensures the concentricity and perpendicularity of the press-fitting while adapting to multiple specifications, thus guaranteeing the consistency of product assembly quality.

[0021] Through the coordinated design of impeller positioning components, rotor positioning components, limit rods and springs, it can adapt to multiple specifications while integrating the function of spring return and push-out, eliminating the need for an additional part picking mechanism and saving costs. Attached Figure Description

[0022] Figure 1 This is an overall structural diagram of the present invention;

[0023] Figure 2 This is a schematic diagram of the impeller positioning component of this utility model;

[0024] Figure 3 This is a schematic diagram of the rotor positioning component of this utility model;

[0025] Figure 4 This is a schematic diagram of the limiting rod structure of this utility model;

[0026] Figure 5 This is a schematic diagram of the upper pressure head structure of this utility model;

[0027] Figure 6 This is a schematic diagram of the base plate structure of this utility model;

[0028] Figure 7 This is a schematic diagram of the working process of this utility model;

[0029] Figure 8 This is a partially enlarged view of the working process of this utility model;

[0030] In the diagram: 1. Impeller positioning component; 11. Impeller positioning support; 12. Through hole; 13. Upper cavity; 14. Middle cavity; 15. Lower cavity; 16. Widening ring; 17. Mounting through hole; 2. Rotor positioning component; 21. Top cavity; 22. Central hollow cylinder; 23. Guide through hole; 24. Limiting step; 3. Limiting rod; 31. Limiting head; 32. Reduced diameter section; 33. Internal threaded hole; 4. Spring; 5. Upper pressure head; 51. Hollow cylinder; 52. Adapter hole; 53. Bolt groove; 6. Motor rotor; 7. Base plate; 71. Mounting hole; 72. Positioning hole; 8. Impeller; 81. Shaft sleeve. Detailed Implementation

[0031] like Figure 1The diagram shows the overall structure of the impeller pressing fixture for an external rotor motor. The impeller positioning component 1 is fixed to the base 7 with fasteners, forming a rigid reference. Inside, the rotor positioning component 2 is coaxially nested, maintaining concentricity. A pre-reserved gap at the top accommodates the impeller's bushing 81, providing space for the impeller and rotor to press together. A limiting rod 3 passes through the impeller positioning component 1 and the rotor positioning component 2. Its lower end is fixed to the base 7 with bolts, and its upper end is limited by a limiting head 31. A spring 4 is fitted onto the limiting rod 3, working with the limiting head to constrain the rotor positioning component 2, ensuring its upper surface is higher than the preset height of the impeller positioning component 1. This preset height is controlled by the length of the limiting rod 3 and the spring preload, achieving both elastic support and ensuring initial position accuracy. The impeller 8 is fitted onto the top of the impeller positioning component 1 via the bushing 81. The rotor head of the motor rotor 6 is embedded in the top of the rotor positioning component 2, with the rotor body located at the upper end of the rotor positioning component 2. The impeller 8 and the motor rotor 6 are initially coaxially aligned. The upper pressure head 5 is located above the motor rotor 6 and is controlled by the hydraulic press.

[0032] The impeller positioning component 1 and the rotor positioning component 2 are coaxially nested, and with the rigid guidance of the limiting rod 3, the concentricity of the impeller 8 and the motor rotor 6 in initial alignment is ensured, guaranteeing pressing accuracy. The combination of the spring 4 and the limiting rod 3 can stably support the rotor positioning component 2 at a preset height, and also provide elastic buffering during pressing to avoid damage to the components from hard impacts, while adapting to the pressing requirements of rotors of different heights. The base 7 and the impeller positioning component 1 are rigidly fixed, and the limiting rod 3 is fixed through it, making the overall frame stable and preventing shaking during pressing, thus improving the consistency and stability of mass production. This combination not only provides stable support for the tooling, preventing shaking or displacement during operation, but also establishes a precise axial positioning reference for other components to be installed subsequently. The impeller 8 and the motor rotor 6 are pre-installed through nesting and sleeve connection, and the upper pressure head 5 can directly apply pressure to complete the pressing without complex adjustments.

[0033] like Figure 2The diagram shows the structure of the impeller positioning component 1. The impeller positioning component 1 is a one-piece, multi-layered, stepped hollow cylindrical structure with a centrally symmetrical layout. The upper part consists of three coaxially arranged cavities: an upper cavity 13, a middle cavity 14, and a lower cavity 15, with their diameters decreasing progressively. The inner diameter of the lower cavity 15 matches the outer diameter of the rotor positioning component 2, forming a sliding fit that allows the rotor positioning component 2 to slide smoothly along the axial direction. The inner diameters of the upper cavity 13 and the middle cavity 14 are larger than the outer diameter of the rotor positioning component 2, forming an annular pre-reserved gap with the outer wall of the rotor positioning component 2 to accommodate the impeller's bushing 81. The lower part is provided with an impeller positioning support 11, which has three axially distributed through holes 12 evenly distributed along its circumference. Each through hole 12 contains a limiting rod 3 fitted with a spring 4. The bottom of the impeller positioning component 1 is provided with a radially outwardly extending widening ring 16. The impeller positioning component 1 is rigidly fixed to the base 7 by bolts through the evenly distributed mounting through holes 17 on the widening ring 16.

[0034] The impeller positioning component 1 is integrally molded in one piece, eliminating the cumulative errors of split assembly, ensuring the coaxiality of the three-stage cavities in the upper part, and improving the overall resistance to deformation. This prevents cavity displacement due to stress during press-fitting and ensures the concentricity of the rotor and impeller during press-fitting. The lower cavity 15, with the smallest diameter, constrains the rotor positioning component 2 through a sliding fit, ensuring its sliding trajectory is strictly axial, and is the core guiding structure. The reserved gaps formed by the upper cavity 13, the middle cavity 14, and the rotor positioning component 2 provide installation space for the impeller bushing 8 and limit the radial wobble of the impeller 8 through the cavity walls, achieving pre-alignment of the impeller and rotor. The large-tolerance design of the stepped cavities with redundant diameters in the upper cavity 13 and the middle cavity 14 can accommodate impeller bushings of different outer diameters without replacing the positioning component. The middle cavity 14 forms a clearance fit with the outer wall of the main body of the motor rotor 6, preventing direct contact between the motor rotor 6 and the inner wall of the cavity from causing jamming during press-fitting.

[0035] Three through holes 12 are evenly distributed along the circumference at a 120° angle, ensuring a symmetrical distribution of the forces exerted by the limiting rod 3 and spring 4. This uniform force distribution ensures that the rotor positioning component 2 experiences balanced forces during sliding, preventing jamming or skew. The through holes 12 provide a pre-positioning channel for the installation of the limiting rod 3, facilitating quick alignment of the limiting rod 3 with the fixing holes of the base 7 during assembly. Since the spring 4 is fitted onto the limiting rod 3, the inner wall of the through holes 12 helps limit the radial deformation of the spring 4 during compression and reset, preventing lateral bending due to uneven force distribution and ensuring stable axial transmission of spring force, thus guaranteeing the force balance of the rotor positioning component 2. Simultaneously, the through holes 12 serve as a machining reference, helping to ensure the perpendicularity of the three-stage cavity to the base mounting surface.

[0036] like Figure 3The diagram shows the structure of the rotor positioning component 2. The rotor positioning component 2 is a cylindrical hollow cylinder. Its outer wall is adapted to the lower cavity 15 of the impeller positioning component 1 to ensure coaxiality with the impeller positioning component. The top cavity 21 provides radial coaxial constraint and pressing force surface for the motor rotor 6, guiding the rotor to slide along the axis during pressing. The design of the central hollow cylinder 22 can reduce the weight of the rotor positioning component 2. There are 6 guide holes 23 evenly distributed around the circumference. They can serve as channels for the limiting rod 3 and also reduce the weight of the positioning component, facilitating the elastic sliding of the positioning component. The bottom edge of the guide hole 23 is provided with a limiting step 24, which is an annular stepped surface. It cooperates with the limiting head 31 at the top of the limiting rod 3. When the rotor positioning component 2 slides up along the limiting rod 3, the limiting step 24 abuts against the limiting head 31, limiting the maximum upward stroke of the rotor positioning component 2.

[0037] The outer wall of rotor positioning component 2 slides with impeller positioning component 1, constraining rotor positioning component 2 itself to be radially coaxial with the impeller. Furthermore, the top cavity 21 constrains the radial position of the motor rotor head, achieving double coaxial constraint and ensuring the concentricity accuracy of the motor rotor 6 and impeller 8 after press-fitting. The limiting head 31 of the limiting rod 3 rigidly contacts the limiting step 24, precisely limiting the upper limit position of rotor positioning component 2. That is, the upper plane of rotor positioning component 2 is higher than the preset height of impeller positioning component 1. Compared with pure spring force control, mechanical limiting is more stable, avoiding drift of the preset height due to spring fatigue. Simultaneously, if the spring fails or breaks, the cooperation between the limiting step 24 and the limiting head 31 prevents rotor positioning component 2 from detaching from the fixture, improving fixture safety and avoiding the risk of component splashing during press-fitting. During assembly, rotor positioning component 2 moves upward to the initial working position where the limiting step 24 abuts against the limiting head 31, eliminating the need for manual calibration and simplifying the assembly and adjustment process.

[0038] like Figure 4 The diagram shows the structure of the limiting rod 3. The limiting rod 3 has a limiting head 31 at the top, which is used to cooperate with the limiting step 24. The middle part is a long cylindrical rod with a uniform diameter, which passes through the through hole 12 of the impeller positioning component 1 and the guide through hole 23 of the rotor positioning component 2. The bottom has a reduced diameter section 32, and the internal threaded hole 33 is machined inside the reduced diameter section 32. The reduced diameter design makes it easy for the limiting rod 3 to be quickly inserted into the mounting hole of the base 7 to achieve pre-positioning. The bolt is screwed into the internal threaded hole 33 of the limiting rod 3 from the bottom of the base 7, so that the base 7 and the limiting rod 3 are rigidly connected, and the limiting rod 3 is axially locked, providing a stable reference for the elastic support system.

[0039] like Figure 5The diagram shows the structure of the upper pressure head 5. A hollow cylinder 51 is used for coaxial connection with the output end of the hydraulic press. A bolt groove 53, penetrating the outer radial end wall of the hollow cylinder 51, is provided. The bolt groove 53 is radially perpendicular to the hollow cylinder 51. Bolts are inserted into the bolt groove 53 to rigidly lock the hollow cylinder 51 to the hydraulic press, preventing relative sliding between the hollow cylinder 51 and the hydraulic press during pressing, ensuring stable axial pressure transmission, and preventing rotor skew during pressing. An adapter hole 52 is provided below the hollow cylinder 51. The adapter hole 52 is a circular hole with a diameter larger than that of the hollow cylinder 51, allowing for the adaptation of different types of motor rotors 6. The large diameter design of the adapter hole 52 allows for adaptation to motor rotors with different top structures without changing the pressure head, improving the tooling versatility. Simultaneously, the "large diameter containment" of the adapter hole allows for slight eccentricity of the rotor top, automatically aligning it during pressing and reducing the stringent requirements for tooling coaxiality.

[0040] like Figure 6 The diagram shows the structure of the base plate 7. The base plate 7 is a square with a side length much larger than the diameter of the impeller positioning component 1, providing a stable support surface and dispersing the impact force during press-fitting. A mounting hole 71 is provided at the position corresponding to the mounting through hole 17, used to rigidly fix the impeller positioning component to the base plate 7; a positioning hole 72 is provided at the position corresponding to the through hole 12. The positioning hole 72 has a rectangular groove. The upper part of the rectangular groove is used to insert the limiting rod 3, which cooperates with the reduced diameter section 32, serving as a radial anti-rotation and pre-positioning function. The lower part is used to accommodate the bolt head, assisting in the rigid connection between the limiting rod 3 and the base 7. When the bolt is inserted from below the base plate, the rectangular groove guides the bolt head to align with the internal threaded hole 33 of the limiting rod 3.

[0041] like Figure 7 and Figure 8 As shown, the working process of this device is as follows:

[0042] First, assemble impeller 8 as follows Figure 8As shown in Figure A, the bushing 81 is inserted into the impeller positioning component 1, located in the gap between the upper cavity 13 of the impeller positioning component 1 and the motor rotor positioning component 2, forming a sliding fit. Utilizing the adaptable structure of the bushing 81 and the impeller positioning component 1, the circumferential and axial positions of the impeller 8 are initially guaranteed, preparing for subsequent alignment with the motor rotor 6. The rotor head 61 of the motor rotor 6 is then installed in the top cavity 21 above the motor rotor positioning component 2. The top cavity 21 positions the motor rotor 6, ensuring that the motor rotor 6, impeller positioning component 1, and bushing 81 are initially coaxial, achieving initial alignment of the motor rotor 6 and impeller 8. The upper pressure head 5 is placed above the motor rotor 6, making it contact the upper surface of the motor rotor 6. At this time, the spring 4 naturally extends, and the rotor positioning component 2 is supported by the elastic force, with its upper surface higher than the upper surface of the impeller positioning component 1. This preset height is controlled by the limiting rod and the initial compression of the spring 4, ensuring the consistency and accuracy of the initial press-fit position. Based on the desired relative position of the motor rotor 6 and impeller 8, the stroke, pressure and other parameters of the hydraulic press are set to provide a control basis for precise pressing.

[0043] When the hydraulic press is started, the upper pressure head 5 presses down the motor rotor 6 under the action of the hydraulic press. At this time, the pressure is greater than the sum of the preload of the spring 4 and the sliding friction. Under the action of the pressure, the motor rotor 6 and the rotor positioning part 2 slide downward along the limit rod 3, the spring is compressed, and elastic potential energy is stored. Since the diameter of the motor rotor 6 is larger than that of the rotor positioning part 2, during the pressing process, the outer wall of the motor rotor 6 will contact the inner wall of the bushing 81. As the pressing stroke advances, the two are pressed together with an interference fit. Figure 8 As shown in Figure B. (As per...) Figure 7 As shown, spring 4 is compressed, providing reverse support force and buffering the pressing process. Combined with stroke control, this achieves precise pressing. When the hydraulic press pressure reaches the preset value, or the downward stroke reaches the set stroke, it is determined that the motor rotor 6 and impeller 8 are properly pressed together. At this time, the motor rotor 6 and impeller 8 form a coaxial rigid connection through an interference fit.

[0044] Once the pressing is complete and the pressing requirements are met, the external pressure source is removed. Spring 4 releases its stored elastic potential energy, restores its deformation, and generates an upward elastic force, pushing the rotor positioning component 2 to reset upward. Since the motor rotor 6 and impeller 8 have formed a rigid connection, the rotor positioning component 2 will move upward along with the impeller 8 and motor rotor 6 assembly during the upward reset process. Finally, the assembly can be pushed out of the tooling for subsequent removal, inspection, or transfer, thus completing the entire pressing process.

[0045] The entire pressing process, through the structural design of the tooling and the coordinated operation of the hydraulic press, achieves precise and stable pressing of the motor rotor and impeller, ensuring the assembly quality and consistency of the product, and is applicable to and adaptable to the process requirements for rotor and impeller assembly in motor production.

Claims

1. A tooling for an external rotor motor rotor impeller, characterized in that: It includes an impeller positioning component (1) and a rotor positioning component (2) coaxially embedded. A limiting rod (3) fitted with a spring (4) passes through both, and the spring (4) elastically supports the bottom surface of the rotor positioning component (2); The inner diameter of the upper cavity (13) of the impeller positioning component (1) is larger than the outer diameter of the rotor positioning component (2), forming a reserved gap for insertion. Impeller (8); The rotor positioning component (2) is provided with a motor rotor (6) and an upper pressure head (5) with an adapter hole (52) in sequence above it.

2. The external rotor motor rotor impeller tooling according to claim 1, characterized in that: The reserved gap accommodates the The impeller (8) has a bushing (81) that allows the bushing (81) to slide against the inner wall of the upper cavity (13); The spring (4) is distributed along the limiting rod (3) and passes through the impeller positioning member (1), cooperating with the limiting rod (3) to control the impeller positioning member (1). The upper plane of the rotor positioning component (2) is set to be higher than the upper plane of the impeller positioning component (1) by a predetermined height.

3. The external rotor motor rotor impeller tooling according to claim 1, characterized in that: The impeller positioning component (1) The middle cavity (14) forms a clearance fit with the rotor body of the motor rotor (6), and the inner diameter of the lower cavity (15) is... The outer diameter of the rotor positioning component (2) is adapted.

4. The external rotor motor rotor impeller tooling according to claim 1 or 2, characterized in that: The impeller positioning component (1) The impeller positioning support (11) at the lower end has three axially through holes (12) evenly distributed along the circumference to accommodate the limiting rod. (3) with the spring (4).

5. The external rotor motor rotor impeller tooling according to claim 1, characterized in that: The rotor positioning component (2) The upper end is provided with a top cavity (21), which accommodates rotors of different types of motor rotors (6). The peripheral wall of the top cavity (21) is fitted with the main body of the motor rotor (6).

6. The external rotor motor rotor impeller tooling according to claim 5, characterized in that: The top cavity (21) The lower end is provided with a central hollow cylinder (22); several guide holes (23) are evenly distributed around the lower end in a circular pattern, the guide holes (23) has a limiting step (24) at the bottom that cooperates with the limiting rod (3).

7. The external rotor motor rotor impeller tooling according to claim 1 or 2, characterized in that: The limiting rod (3) The top is provided with a limiting head (31) and the bottom is provided with a reduced diameter section (32), and the reduced diameter section (32) is machined with an internal thread hole (33).

8. The external rotor motor rotor impeller tooling according to claim 1, characterized in that: The upper pressure head (5) is internally equipped with A hollow cylinder (51) is connected to a hydraulic press, and the outer radial end wall of the hollow cylinder (51) is provided with a connection to the hollow cylinder (51). A radially vertical through bolt groove (53); the diameter of the adapter hole (52) is larger than that of the hollow cylinder (51).

9. The external rotor motor rotor impeller tooling according to claim 1 or 2, characterized in that: The base plate (7) is provided with Mounting hole (71) that mates with the impeller positioning member (1) and positioning hole (72) that mates with the limiting rod (3).

10. The external rotor motor rotor impeller tooling according to claim 9, characterized in that: The impeller positioning component (1) The bottom plate (7) is fixed by the mounting through holes (17) evenly distributed on the bottom widening ring (16).

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