In-wheel motor shell press-fitting device

Abstract

The application discloses a wheel hub motor shell press-fitting equipment and relates to the technical field of press-fitting equipment.The application is characterized in that a plurality of negative pressure holes are uniformly arranged in a placing table, so that the wheel hub motor shell can be quickly and horizontally fixed on the placing table, the bottom surface of the wheel hub motor shell is completely attached to the placing table through negative pressure adsorption, the eccentric risk of the stator core caused by the inclination of the placing table is eliminated, the vacuum adsorption provides rigid fixing, the displacement or shaking of the wheel hub motor shell during the downward pressing of the hydraulic machine is prevented, the limiting column always keeps a stationary state to maintain a precise initial positioning reference, the moving plate freely drives the bracket and the rubber pressure head to move downward to complete the press-fitting action, the positioning precision and the press-fitting quality are improved in quality, the elastic property of the rubber pressure head ensures sufficient press-fitting force and avoids damage risk caused by excessive constraint, the stator core can be pressed into the wheel hub motor shell in an optimal state, the process requirement of interference fit is perfectly met, and the motor assembly quality and performance consistency are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of press-fitting equipment technology, specifically to a hub motor housing press-fitting device. Background Technology

[0002] With the rapid development of new energy vehicles and electric transportation tools, the manufacturing process requirements for hub motors, as the core component of direct drive systems, are becoming increasingly stringent. The press-fitting of the stator core and the motor housing is a key assembly process that directly determines the electromagnetic performance, mechanical strength, and operational reliability of the motor. Hub motor housing press-fitting equipment is an intelligent equipment specifically designed for the assembly of hub motors in new energy vehicles. It adopts a modular structure design and is mainly composed of a precision positioning system and an intelligent pressure control system core module, which realizes high-precision and high-efficiency interference fit assembly of the stator core and the motor housing.

[0003] Existing press-fitting equipment applies uneven force to the hub motor housing and stator core during placement, causing the housing to shift. This uneven force during press-fitting directly leads to inconsistent fit clearances between the stator core and the housing, resulting in localized interference or loosening. This affects the concentricity and air gap uniformity of the motor during operation, reducing electromagnetic performance. Furthermore, press-fitting at an angle subjects the stator core to lateral stress, causing interlayer deformation of the silicon steel sheets and even damage to the insulating coating, thereby increasing iron loss or posing a short-circuit risk. The assembled components deform due to residual stress, making them prone to fatigue cracks or fit failures during long-term operation, thus shortening the motor's lifespan. Summary of the Invention

[0004] To address the problem of concentricity deviation between the hub motor housing and stator core in existing press-fitting equipment, this invention provides a hub motor housing press-fitting device.

[0005] The present invention is achieved through the following technical solution: a hub motor housing pressing device, including a pressing machine, wherein a feeding component is installed inside the pressing machine, and a balancing component is installed on the top surface of the feeding component; The balancing assembly includes a placement platform and a negative pressure ring groove. The placement platform is installed on the top surface of the feeding assembly. The placement platform has a negative pressure ring groove inside and several negative pressure holes evenly distributed inside. A negative pressure connector is installed on the outer surface of the placement platform. A sealing ring groove is opened on the top surface of the placement platform. Several reset holes are evenly distributed inside the placement platform. A spring is installed on the inner wall of each of the reset holes. A ring block is installed on the top surface of each of the springs. The outer surface of the ring block is in contact with the inner wall of the sealing ring groove. Two sealing strips are installed on the top surface of the ring block. The balancing assembly quickly and stably balances and places the hub motor housing through several negative pressure holes, ensuring the concentricity of the stator core and the hub motor housing, avoiding deformation caused by unilateral force, and thus stably achieving interference fit press fitting.

[0006] Furthermore, one end surface of several of the negative pressure holes is in communication with the inner wall of the negative pressure ring groove, and one end surface of the negative pressure connector is in communication with the inner wall of the negative pressure ring groove.

[0007] Furthermore, the feeding assembly includes a stepper motor and a ball screw. The stepper motor is installed inside the press machine. A ball screw is installed on the outer surface of the output end of the stepper motor. Two screw sliders are movably installed on the outer surface of the ball screw. A connecting plate is installed on the outer surface of each of the two screw sliders.

[0008] Furthermore, a base is mounted on the top surface of both connecting plates, and the top surface of the base is fixedly connected to the bottom surface of the placement platform. Two limiting slide rails are installed inside the press machine, and two limiting sliders are movably mounted on the top surface of each of the two limiting slide rails. The top surfaces of the four limiting sliders are fixedly connected to the bottom surface of the base.

[0009] Furthermore, the press machine is equipped with a hydraulic assembly, which includes a frame and a hydraulic press. The frame is installed inside the press machine, and the hydraulic press is mounted on the top surface of the frame. A movable plate is mounted on the outer surface of the output end of the hydraulic press, and four guide columns are installed inside the movable plate.

[0010] Furthermore, the outer surfaces of the four guide pillars are in active contact with the interior of the platform, and four brackets are installed on the bottom surface of the movable plate, with rubber pressure heads installed on the bottom surfaces of the four brackets.

[0011] Furthermore, four limiting components are installed inside the movable plate, and an electromagnet is installed inside the movable plate. Each limiting component includes a limiting slide cavity and a limiting slider II. A limiting slide cavity is formed inside the movable plate, and a limiting slider II is movably installed inside the limiting slide cavity.

[0012] Furthermore, a second spring is installed on the inner wall of the limiting slide cavity, a pressing column is installed on one end surface of the limiting slider two, one end surface of the pressing column is in movable contact with one end surface of the second spring, a fixing sleeve is installed on the top surface of the limiting slider two, and a limiting column is movably installed inside the fixing sleeve.

[0013] The present invention has the following beneficial effects: This hub motor housing pressing equipment uses several negative pressure holes evenly distributed within the placement platform to quickly and horizontally fix the hub motor housing onto the platform. The negative pressure adsorption ensures that the bottom surface of the hub motor housing is completely in contact with the placement platform, eliminating the risk of stator core eccentricity caused by tilting. Furthermore, the multiple negative pressure holes work together to avoid slight deformation of the hub motor housing caused by uneven local adsorption forces. Vacuum adsorption provides rigid fixation, preventing displacement or shaking of the hub motor housing when the hydraulic press is pressed down.

[0014] This hub motor housing press-fitting equipment uses the main pressure of the hydraulic press to be precisely transmitted to the rubber press head through the bracket to form the main pressing force. At the same time, the auxiliary positioning system with the fixed sleeve moving independently ensures that it does not interfere with the reference position of the limit post. Combined with the unique elastic deformation characteristics of the rubber press head, it achieves adaptive and balanced pressure distribution, solving the problems of pressure concentration and off-center load in traditional press-fitting.

[0015] This hub motor housing pressing equipment maintains a precise initial positioning reference by keeping the limiting column stationary, while the moving plate freely drives the bracket and rubber pressure head downward to complete the pressing action. This significantly improves positioning accuracy and pressing quality. The elasticity of the rubber pressure head ensures sufficient pressing force while avoiding the risk of damage caused by over-constraint. The independent movement of the fixed sleeve fundamentally eliminates the motion interference problem between positioning and pressing in traditional systems, allowing the stator core to be pressed into the hub motor housing in the best condition, perfectly achieving the interference fit process requirements, and significantly improving the motor assembly quality and performance consistency.

[0016] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the press-fitting machine of the present invention; Figure 2 This is a schematic diagram of the overall structure of the feeding assembly of the present invention; Figure 3 This is a schematic diagram of the internal structure of the feeding component of the present invention; Figure 4 This is a schematic diagram of the overall structure of the placement platform of the present invention; Figure 5 This is a schematic diagram of the internal structure of the balancing component of the present invention; Figure 6 This is a schematic diagram of the internal structure of the balancing component of the present invention from another perspective; Figure 7 This is a schematic diagram of the overall structure of the hydraulic assembly of the present invention; Figure 8 This is a schematic diagram of the overall structure of the limiting component of the present invention.

[0018] In the diagram: 1. Press fitting machine; 2. Feeding assembly; 201. Stepper motor; 202. Ball screw; 203. Screw slider; 204. Connecting plate; 205. Limit slider one; 206. Limit slide rail; 207. Base; 3. Balancing assembly; 301. Placement platform; 302. Negative pressure ring groove; 303. Negative pressure connector; 304. Negative pressure hole; 305. Sealing ring groove; 306. Reset hole; 307. 1. Spring 1; 308. Ring block; 309. Sealing strip; 4. Hydraulic assembly; 401. Stand; 402. Hydraulic press; 403. Moving plate; 404. Guide column; 405. Bracket; 406. Rubber pressure head; 5. Limiting assembly; 501. Limiting slide cavity; 502. Limiting slider 2; 503. Fixing sleeve; 504. Limiting column; 505. Spring 2; 506. Extrusion column; 6. Electromagnet. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] In the description of this invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around", etc., which indicate orientation or positional relationship, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0021] Please see Figures 1-8 The present invention provides a technical solution: a hub motor housing pressing device, including a pressing machine 1, a feeding component 2 installed inside the pressing machine 1, and a balancing component 3 installed on the top surface of the feeding component 2; The balancing assembly 3 includes a placement platform 301 and a negative pressure ring groove 302. The placement platform 301 is mounted on the top surface of the feeding assembly 2. The negative pressure ring groove 302 is formed inside the placement platform 301. Several negative pressure holes 304 are evenly distributed inside the placement platform 301. A negative pressure connector 303 is installed on the outer surface of the placement platform 301. A sealing ring groove 305 is formed on the top surface of the placement platform 301. Several reset holes 306 are evenly distributed inside the placement platform 301. A spring 307 is installed on the inner wall of each reset hole 306. A ring block 308 is installed on the top surface of each spring 307. The outer surface of the ring block 308 is in contact with the inner wall of the sealing ring groove 305. Two sealing strips 309 are installed on the top surface of the ring block 308. The balancing assembly 3 uses the several negative pressure holes 304 to press the hub motor housing. The system ensures rapid, balanced, and stable placement, guaranteeing the concentricity of the stator core and the hub motor housing. This prevents deformation caused by unilateral force, thus achieving stable interference fit press-fitting. One end surface of several negative pressure holes 304 is connected to the inner wall of the negative pressure ring groove 302, and one end surface of the negative pressure connector 303 is also connected to the inner wall of the negative pressure ring groove 302. The several negative pressure holes 304 are evenly distributed within the placement platform 301, allowing the hub motor housing to be quickly and horizontally fixed on the placement platform 301. Negative pressure adsorption ensures that the bottom surface of the hub motor housing is completely in contact with the placement platform 301, eliminating the risk of stator core eccentricity caused by placement tilt. Furthermore, the multiple negative pressure holes 304 work together to avoid slight deformation of the hub motor housing caused by uneven local adsorption forces. Vacuum adsorption provides rigid fixation, preventing displacement or shaking of the hub motor housing when the hydraulic press 402 is pressed down, thus placing the stator core above the hub motor housing.

[0022] The feeding assembly 2 includes a stepper motor 201 and a ball screw 202. The stepper motor 201 is installed inside the press machine 1. The ball screw 202 is installed on the outer surface of the output end of the stepper motor 201. Two screw sliders 203 are movably installed on the outer surface of the ball screw 202. A connecting plate 204 is installed on the outer surface of each of the two screw sliders 203. A base 207 is installed on the top surface of the two connecting plates 204. The top surface of the base 207 is fixedly connected to the bottom surface of the placement table 301. Two limit slide rails 206 are installed inside the press machine 1. Two limit sliders 205 are movably installed on the top surface of each of the two limit slide rails 206. The top surfaces of the four limit sliders 205 are fixedly connected to the bottom surface of the base 207, so that the base 207 stably drives the placement table 301 to move. The base 207 stably drives the placement table 301 to move directly below the frame 401.

[0023] The press machine 1 is internally equipped with a hydraulic assembly 4, which includes a frame 401 and a hydraulic press 402. The frame 401 is mounted inside the press machine 1, and the hydraulic press 402 is mounted on the top surface of the frame 401. A movable plate 403 is mounted on the outer surface of the output end of the hydraulic press 402. Four guide columns 404 are installed inside the movable plate 403, and the outer surfaces of the four guide columns 404 are in contact with the interior of the frame 401. Four supports 405 are mounted on the bottom surface of the movable plate 403, and rubber pressure heads 406 are mounted on the bottom surface of each of the four supports 405. The hydraulic press 402 then operates. This causes the moving plate 403 to drive the four supports 405 and the four rubber pressure heads 406 to continue pressing downwards, while the fixed sleeve 503 moves downwards and the limiting post 504 remains stationary. This does not affect the pressing of the stator core by the four rubber pressure heads 406. The main pressure of the hydraulic press 402 is accurately transmitted to the rubber pressure heads 406 through the supports 405 to form the main pressing force. At the same time, the auxiliary positioning system of the fixed sleeve 503 moving downwards independently ensures that it does not interfere with the reference position of the limiting post 504. Combined with the unique elastic deformation characteristics of the rubber pressure head 406, the pressure is adaptively and evenly distributed, which solves the problems of pressure concentration and off-center load in traditional pressing.

[0024] Four limiting components 5 are installed inside the movable plate 403. An electromagnet 6 is also installed inside the movable plate 403. Each limiting component 5 includes a limiting slide cavity 501 and a limiting slider 502. The limiting slide cavity 501 is formed inside the movable plate 403, and the limiting slider 502 is movably installed inside the limiting slide cavity 501. A spring 505 is installed on the inner wall of the limiting slide cavity 501. A pressing post 506 is installed on one end surface of the limiting slider 502, and one end surface of the pressing post 506 is in movable contact with one end surface of the spring 505. A fixing sleeve 503 is installed on the top surface of the limiting slider 502, and the fixing sleeve 503 is movable inside. The installation of the limiting post 504 ensures that the limiting post 504 remains stationary, maintaining a precise initial positioning reference. Meanwhile, the moving plate 403 freely drives the bracket 405 and the rubber pressure head 406 downward to complete the pressing action, thereby significantly improving the positioning accuracy and pressing quality. The elastic characteristics of the rubber pressure head 406 ensure sufficient pressing force while avoiding the risk of damage caused by over-constraint. The independent movement of the fixed sleeve 503 fundamentally eliminates the motion interference problem between positioning and pressing in the traditional system, allowing the stator core to be pressed into the hub motor housing in the best condition, perfectly achieving the interference fit process requirements, and significantly improving the motor assembly quality and performance consistency.

[0025] The specific workflow of this invention is as follows: When it is necessary to press-fit the hub motor housing and the stator core, the hub motor housing is placed on the placement platform 301. The hub motor housing compresses the two sealing strips 309, thereby causing the two sealing strips 309 to synchronously drive the ring block 308 to move within the sealing ring groove 305. The ring block 308 compresses several springs 307, causing the springs 307 to undergo elastic deformation. The springs 307 also press the two sealing strips 309 against the bottom surface of the hub motor housing, thereby sealing and wrapping several negative pressure holes 304. The flexible hose extending from the vacuum machine pipe is connected to the negative pressure connector 303, passing through the negative pressure ring groove 305. Vacuuming is performed using 02 and several negative pressure holes 304. The hub motor housing is quickly adsorbed through the several negative pressure holes 304. The several negative pressure holes 304 are evenly distributed in the placement platform 301, so that the hub motor housing is quickly and horizontally fixed on the placement platform 301. The negative pressure adsorption makes the bottom surface of the hub motor housing completely fit the placement platform 301, eliminating the risk of stator core eccentricity caused by placement tilt. Moreover, the multiple negative pressure holes 304 work together to avoid slight deformation of the hub motor housing caused by uneven local adsorption force. Vacuum adsorption provides rigid fixation to prevent the hub motor housing from shifting or shaking when the hydraulic press 402 is pressed down, and the stator core is placed above the hub motor housing.

[0026] The stepper motor 201 is controlled by the controller to work, thereby driving the ball screw 202 to rotate. The ball screw 202 synchronously drives two screw sliders 203 to move synchronously. The two screw sliders 203 drive the base 207 to move through the connecting plate 204. The base 207 drives four limit sliders 205 to move stably on the limit slide rail 206, thereby stably driving the placement platform 301 to move to directly below the frame 401.

[0027] The hydraulic press 402 is controlled by a controller to operate, which drives the moving plate 403 to move downwards. After the moving plate 403 moves downwards a certain distance, the controller controls the electromagnet 6 to be energized. The electromagnet 6 is magnetic. The limit sliders 502 are made of ferrous material, causing the four limit sliders 502 to move in the limit slide cavity 501 towards the electromagnet 6. The four limit sliders 502 synchronously drive the fixed sleeve 503 and the extrusion column 506 to move. The extrusion column 506 extrudes the spring 505, and the fixed sleeve 503 synchronously drives the spring 505 to move. The four limit posts 504 move, limiting and fixing the stator core. Made of rubber, the limit posts 504 allow for manual rotation of the stator core. The bottom surfaces of the four limit posts 504 are in contact with the top surface of the hub motor housing. After the stator core is positioned, the hydraulic press 402 continues to operate, causing the moving plate 403 to drive the four supports 405 and the four rubber pressure points. The head 406 continues to press downwards, and the fixed sleeve 503 moves downwards while the limiting post 504 remains stationary. This does not affect the pressing of the stator core by the four rubber pressure heads 406. The main pressure of the hydraulic press 402 is precisely transmitted to the rubber pressure heads 406 through the bracket 405 to form the main pressing force. At the same time, the auxiliary positioning system of the independently descending fixed sleeve 503 ensures that it does not interfere with the reference position of the limiting post 504. Combined with the unique elastic deformation characteristics of the rubber pressure head 406, it achieves adaptive and balanced pressure distribution, solving the problems of pressure concentration and uneven load in traditional pressing. The limiting post 504 remains stationary throughout. The initial positioning reference is maintained with precision, while the moving plate 403 freely drives the bracket 405 and the rubber pressure head 406 to move downward to complete the pressing action, which improves the positioning accuracy and pressing quality. The elasticity of the rubber pressure head 406 ensures sufficient pressing force and avoids the risk of damage caused by over-constraint. The independent movement of the fixed sleeve 503 fundamentally eliminates the motion interference problem between positioning and pressing in the traditional system, so that the stator core can be pressed into the hub motor housing in the best condition, perfectly achieving the process requirements of interference fit, and significantly improving the motor assembly quality and performance consistency.

[0028] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0029] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A hub motor housing press-fitting device, comprising a press-fitting machine (1), characterized in that: The press machine (1) is equipped with a feeding assembly (2) inside, and a balancing assembly (3) is installed on the top surface of the feeding assembly (2). The balancing component (3) includes a placement platform (301) and a negative pressure ring groove (302). The placement platform (301) is installed on the top surface of the feeding component (2). The negative pressure ring groove (302) is provided inside the placement platform (301). Several negative pressure holes (304) are evenly distributed inside the placement platform (301). A negative pressure connector (303) is installed on the outer surface of the placement platform (301). A sealing ring groove (305) is provided on the top surface of the placement platform (301). Several reset holes (306) are evenly distributed inside the placement platform (301). A spring (307) is installed on the inner wall of each of the reset holes (306), and a ring block (308) is installed on the top surface of each of the springs (307). The outer surface of the ring block (308) is in contact with the inner wall of the sealing ring groove (305). Two sealing strips (309) are installed on the top surface of the ring block (308). The balance assembly (3) quickly and stably balances and places the hub motor housing through a number of negative pressure holes (304) to ensure the concentricity of the stator core and the hub motor housing, avoid deformation caused by unilateral force, and thus stably achieve interference fit press fitting. The press machine (1) is equipped with a hydraulic assembly (4), which includes a frame (401) and a hydraulic press (402). The press machine (1) is equipped with a frame (401), and the top surface of the frame (401) is equipped with a hydraulic press (402). The outer surface of the output end of the hydraulic press (402) is equipped with a moving plate (403). The moving plate (403) is equipped with four guide columns (404). The outer surfaces of the four guide columns (404) are in contact with the interior of the frame (401). The bottom surface of the moving plate (403) is equipped with four supports (405), and the bottom surfaces of the four supports (405) are all equipped with rubber pressure heads (406). The movable plate (403) is equipped with four limiting components (5) and an electromagnet (6). The limiting components (5) include a limiting slide cavity (501) and a limiting slider (502). The movable plate (403) has a limiting slide cavity (501) inside. The limiting slider (502) is movably installed inside the limiting slide cavity (501). A spring (505) is installed on the inner wall of the limiting slide cavity (501). A pressing column (506) is installed on one end surface of the limiting slider (502). One end surface of the pressing column (506) is in movable contact with one end surface of the spring (505). A fixing sleeve (503) is installed on the top surface of the limiting slider (502). A limiting column (504) is movably installed inside the fixing sleeve (503).

2. The hub motor housing press-fitting equipment according to claim 1, characterized in that: One end surface of several of the negative pressure holes (304) is in communication with the inner wall of the negative pressure ring groove (302), and one end surface of the negative pressure connector (303) is in communication with the inner wall of the negative pressure ring groove (302).

3. The hub motor housing press-fitting equipment according to claim 1, characterized in that: The feeding assembly (2) includes a stepper motor (201) and a ball screw (202). The stepper motor (201) is installed inside the press machine (1). A ball screw (202) is installed on the outer surface of the output end of the stepper motor (201). Two screw sliders (203) are movably installed on the outer surface of the ball screw (202). A connecting plate (204) is installed on the outer surface of each of the two screw sliders (203).

4. The hub motor housing press-fitting equipment according to claim 3, characterized in that: The top surfaces of the two connecting plates (204) are jointly mounted with a base (207). The top surface of the base (207) is fixedly connected to the bottom surface of the placement platform (301). The press machine (1) is equipped with two limiting slide rails (206). The top surfaces of the two limiting slide rails (206) are movably mounted with two limiting sliders (205). The top surfaces of the four limiting sliders (205) are fixedly connected to the bottom surface of the base (207).

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