Automobile steering motor rotor stator assembly machine and assembly method

Abstract

The application discloses an automobile steering motor rotor stator assembling machine and an assembling method. It comprises: a bottom plate, the bottom plate is provided with a stator jig, a rotor jig and a heating assembly, the stator jig is fixedly assembled on the bottom plate, and the rotor jig and the heating assembly are arranged on the front and back sides of the stator jig; a first moving plate, the first moving plate is slidably assembled on the bottom plate, the rotor jig is movably assembled on the first moving plate, and a flange plate positioning pin is fixed on the top surface of the rotor jig; a top rod, the top rod is movably assembled on the bottom plate; a movable plate, the movable plate is movably arranged above the stator jig, and the movable plate is provided with an upper jig floating plate, and a flange plate positioning column is fixed to the bottom surface of the upper jig floating plate. The application has the beneficial effects that: the rotor assembling deflection and the damage of the stator winding and the iron core are effectively prevented; the risk of extrusion deformation and damage of parts is reduced; the interference shrink fit assembling and the non-heating gap assembling two operation conditions can be adapted.

Description

Technical Field

[0001] This invention relates to the technical field of motor rotor and stator assembly, and in particular to an assembly machine and method for automotive steering motor rotor and stator. Background Technology

[0002] In the manufacturing process of electric power steering (EPS) motors, the assembly of the rotor and stator assemblies is a critical step. Depending on the motor design, the fit between the stator housing assembly and the rotor flange assembly can be categorized into two types: interference fit (thermal fit) and clearance fit. For motors with an interference fit, the stator housing assembly needs to be heated to expand its inner diameter before pressing the rotor flange assembly in. For motors with a clearance fit, no heating is required; the rotor flange assembly can be directly installed into the stator housing assembly.

[0003] Currently, in small-batch production or R&D trials, the assembly of the above two fitting methods mostly relies on manual operation. Traditional methods have the following problems: First, the insertion process of the rotor flange assembly is purely manual, resulting in high labor intensity and difficulty in ensuring assembly accuracy. Operators hold the rotor flange assembly, manually aligning it with the inner cavity of the stator housing assembly and applying insertion force. Because interference fits require overcoming significant resistance, operators experience high physical exertion and fatigue over extended periods. Simultaneously, the rotor assembly has strong magnetism during manual insertion, making it difficult to ensure coaxiality between the rotor flange assembly and the stator housing assembly. Any deviation in the insertion angle can easily cause the rotor to scratch the stator windings or damage the core, leading to motor failure (NG). Second, existing equipment or tooling typically only supports one fitting method (interference fit or clearance fit), making it impossible to accommodate both operating conditions on the same equipment. When production plans switch between interference fit and clearance fit motors, different assembly tooling or even equipment replacement is required, resulting in long changeover times, high costs, and difficulty adapting to the flexible production needs of small-batch, multi-variety production.

[0004] In summary, there is a need for an automotive steering motor rotor and stator assembly machine and method that can simultaneously adapt to both interference fit and clearance fit assembly conditions, and has high positioning accuracy and stable assembly quality. Summary of the Invention

[0005] The present invention aims to overcome the shortcomings of the prior art and provides an automotive steering motor rotor and stator assembly machine and assembly method that can simultaneously adapt to both interference fit and clearance fit assembly conditions, and has high positioning accuracy and stable assembly quality.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: An automotive steering motor rotor-stator assembly machine, comprising: The base plate is provided with a stator fixture, a rotor fixture and a heating assembly. The stator fixture is fixedly assembled to the base plate. The rotor fixture and the heating assembly are respectively arranged on the front and rear sides of the stator fixture and are both in sliding fit with the base plate. The first movable plate is slidably mounted on the base plate. The rotor fixture is movably mounted on the first movable plate and connected to the first spring. The rotor fixture has a rotor placement notch on the side facing the stator fixture. A flange positioning pin is fixed on the top surface of the rotor fixture. The flange positioning pin is distributed on both sides of the rotor placement notch. A push rod is mounted vertically on the base plate and located directly below the stator fixture. The stator fixture has a push rod clearance hole. The movable plate is movably mounted above the stator fixture. The bottom of the movable plate is provided with an upper fixture floating plate. The upper fixture floating plate is movably mounted on the movable plate and connected to the movable plate by a second spring. The bottom surface of the upper fixture floating plate is fixed with flange positioning pins that correspond one-to-one with the flange positioning pins. A top plate is provided above the movable plate. The top plate and the bottom plate are fixedly connected by several movable plate guide columns. Movable plate linear bearings that match the movable plate guide columns are fixedly mounted on the movable plate. The movable plate is fitted onto the movable plate guide columns through the movable plate linear bearings and slides up and down with them. A servo electric cylinder is fixedly mounted on the top plate. A pressure sensor is fixedly mounted on the top surface of the movable plate. The telescopic end of the servo electric cylinder is fixedly mounted on the pressure sensor.

[0007] During assembly, the housing stator assembly is first placed on the stator fixture, and then the rotor portion of the flange rotor assembly is placed in the rotor placement notch. Positioning is achieved by inserting the flange locating pin into the flange assembly hole on the flange rotor assembly. The heating components on both sides of the stator fixture and the rotor fixture can slide back and forth along the base plate. First, the housing stator assembly is heated by the heating components to achieve interference fit assembly (this step can be skipped in clearance assembly cases). Then, the first moving plate drives the flange rotor assembly on the rotor fixture to slide between the housing stator assembly and the upper fixture floating plate. After the flange rotor assembly is in place, the moving plate drives the upper fixture floating plate downwards. When the flange positioning pins and the lower flange positioning pins abut against each other, the first spring is compressed downwards simultaneously. Then, the push rod passes through the push rod clearance hole on the stator fixture and the shaft hole on the stator assembly of the housing in sequence, pushing the flange rotor assembly upwards. This lifts the flange rotor assembly, causing the flange assembly hole to disengage from the flange positioning pin and be completely fitted onto the flange positioning pin (the flange positioning pin and flange positioning pin are machined using the same central datum to ensure consistent coaxiality of the upper and lower positioning structures). At the same time, the second spring is also compressed upwards. After the transition is completed, the first moving plate slides back to its original position, the movable plate continues to feed downwards, and the push rod moves downwards synchronously until the flange rotor assembly is completely pressed into the interior of the stator assembly of the housing. This assembly mechanism relies on the cooperation of flange positioning pins and flange positioning columns to complete the rotor transfer positioning, which can stably ensure the coaxiality of the flange rotor assembly and the housing stator assembly, improve positioning accuracy, and effectively prevent rotor assembly misalignment from scratching the stator windings and core. A double-layer floating buffer structure is formed by the first and second springs, which, together with the synchronously moving push rod, performs pressing to buffer the assembly impact force, reduce the risk of component extrusion deformation and damage, and ensure stable assembly quality. The push rod supports the rotor throughout the process to counteract the permanent magnet attraction, which can effectively prevent the rotor from being magnetically attracted to one side of the stator and causing scratches. The equipment can adapt to both interference fit assembly and non-heated gap assembly working conditions. There is no need to change tooling when switching production models, and it is suitable for mixed production of multiple specifications of motors. The whole machine relies on the positioning structure to uniformly constrain the placement, alignment, and pressing posture of the workpiece, eliminate the assembly dimension dispersion problem caused by manual operation, improve the consistency of finished product assembly, and at the same time, the whole structure has a high degree of process integration, simplifies the assembly operation process, and reduces the intensity of manual operation. The servo electric cylinder drives the movable plate to rise and fall stably along the guide column of the movable plate, with a high degree of automation. The linear bearing of the movable plate ensures smooth sliding without jamming. The guide column of the movable plate can strictly constrain the running trajectory of the movable plate to avoid deviation during the pressing process. The servo electric cylinder, together with the pressure sensor, can monitor the pressing force in real time, accurately control the pressing pressure and stroke, and prevent excessive pressing force from squeezing and damaging the housing stator assembly, flange rotor assembly, etc., thereby improving the controllability of the pressing process and the qualification rate of the assembled product.

[0008] Preferably, a stator clamping cylinder fixing block is fixedly mounted on the base plate. The stator clamping cylinder fixing block is symmetrically arranged on the left and right sides of the stator fixture. A stator clamping cylinder is fixedly mounted on the stator clamping cylinder fixing block. The telescopic end of the stator clamping cylinder faces the stator fixture and is fixedly mounted on it. The side of the stator clamping fixture facing the stator fixture is set as an arc-shaped clamping surface with several toothed grooves. The stator clamping cylinders symmetrically arranged on both sides can evenly clamp the stator assembly from both sides of the housing stator assembly through the arc-shaped stator clamping fixture with toothed grooves. The clamping force is balanced and not easy to slip, which can effectively limit the offset and shaking of the housing stator assembly during assembly, and ensure the alignment and coaxiality of the flange rotor assembly and the housing stator assembly. The arc-shaped surface adapts to the shape of the stator housing, and the toothed grooves can increase the clamping friction, further improving the clamping stability of the housing stator assembly.

[0009] Preferably, a second movable plate is slidably mounted on the base plate, and the heating component is slidably mounted on the top surface of the second movable plate. A linear guide rail for the heating component is fixed on the base plate, and a slider for the heating component is fixed on the bottom surface of the second movable plate. The second movable plate is slidably mounted on the base plate through the cooperation of the slider and the linear guide rail. A linear motor module for the heating component to move back and forth is also fixedly mounted on the base plate. The linear motor module for the heating component to move back and forth is connected to the second movable plate and is used to drive the second movable plate to slide back and forth along the linear guide rail of the heating component. A heating coil is provided on the side of the heating component facing the stator fixture. The second moving plate slides smoothly by cooperating with the heating component slider and the heating component linear guide. The linear motor module for the front and rear movement of the heating component provides stable driving force and can accurately control the front and rear position of the heating component. The heating component is vertically slidably mounted on the top surface of the second moving plate, which can flexibly adjust the heating height. There is no need for manual movement or adjustment of the heating coil throughout the process. It automatically completes the switching between the heating position and the standby position, with a high degree of automation and high repeatability of the heating position. It significantly shortens the heating preparation time and ensures accurate alignment between the heating coil and the stator assembly of the machine housing. It effectively avoids problems such as heating position deviation, local overheating or insufficient heating of the stator caused by manual adjustment. The sliding cooperation structure moves smoothly and has high positioning repeatability, which stably ensures uniform heating of the stator.

[0010] Preferably, a heating component vertical movement cylinder mounting plate is provided above the second movable plate. The heating component vertical movement cylinder mounting plate is fixedly connected to the second movable plate by a plurality of heating component vertical movement guide columns. A heating component vertical movement cylinder is fixedly mounted on the heating component vertical movement cylinder mounting plate. The telescopic end of the heating component vertical movement cylinder faces the second movable plate and the heating component mounting plate is fixed thereon. The heating component mounting plate has guide column through holes that match the heating component vertical movement guide columns. The heating component mounting plate is fitted onto the heating component vertical movement guide columns through the guide column through holes and is slidably assembled with them vertically. The heating component is fixedly mounted on the heating component mounting plate. The heating component's vertical movement is controlled by a cylinder that works in conjunction with multiple guide columns to vertically guide and limit the heating component's mounting plate. The cylinder drives the heating component to move up and down smoothly without any deviation or wobbling during the movement. The vertical distance between the heating coil and the stator assembly of the housing can be precisely controlled without the need for manual height adjustment. It has a high degree of automation, good positioning consistency, and can stably maintain a uniform heating area on the stator, avoiding defects such as local overheating or underheating. The sliding structure of the guide columns and through holes improves the smoothness of the lifting operation and the structural rigidity, effectively ensuring the positioning accuracy of the heating process.

[0011] Preferably, a rotor assembly linear guide rail is fixed on the base plate, and a rotor assembly slider is fixed on the bottom surface of the first moving plate. The first moving plate is slidably mounted on the base plate through the cooperation of the rotor assembly slider and the rotor assembly linear guide rail. A rotor assembly forward and backward movement linear motor module is also fixedly mounted on the base plate. The rotor assembly forward and backward movement linear motor module is connected to the first moving plate and is used to drive the first moving plate to slide forward and backward along the rotor assembly linear guide rail. The cooperation between the rotor assembly slider and the rotor assembly linear guide rail allows the first moving plate to slide smoothly and run stably. Combined with the forward and backward movement linear motor module, the rotor fixture can be automatically fed and reset, achieving a high degree of automation. There is no need for manual movement of the rotor assembly. The transfer and positioning accuracy is high, and it can stably and accurately transport the flange rotor assembly to the coaxial position of the stator center. This avoids the problem of rotor scratching the stator core and windings caused by manual alignment deviation from the source. The sliding guide structure has good rigidity and can maintain stable transfer accuracy even during long-term operation, ensuring assembly coaxiality and finished product yield.

[0012] Preferably, the rotor fixture is fixedly equipped with several rotor fixture linear bearings. A rotor assembly guide post, matching the rotor fixture linear bearings, is fixed on the top surface of the first moving plate. The rotor fixture linear bearings are fitted onto the rotor assembly guide posts and slide vertically with them. A first spring is sleeved on the outside of the rotor assembly guide post, with its two ends abutting against the lower end of the rotor fixture linear bearing and the top surface of the first moving plate, respectively. A rotor fixture limiting shim for positioning is fixedly fitted to the top of the rotor assembly guide post. The rotor fixture linear bearings and rotor assembly guide posts cooperate to achieve smooth vertical sliding of the rotor fixture. The first spring sleeved on the rotor assembly guide post provides buffering force when the rotor fixture is pressed down. The rotor fixture limiting shim limits the maximum upward sliding stroke of the rotor fixture, preventing it from dislodging from the rotor assembly guide post. The overall sliding guide structure moves smoothly and provides uniform buffering force, effectively mitigating the impact during assembly and docking, avoiding hard collisions between the flange rotor assembly and the positioning structure that could cause damage to components, and ensuring stable rotor transfer alignment accuracy.

[0013] Preferably, a push rod cylinder mounting plate is provided below the base plate. The push rod cylinder mounting plate is fixedly connected to the base plate by several push rod guide columns. A push rod floating plate is also provided between the push rod cylinder mounting plate and the base plate. A push rod linear bearing matching the push rod guide column is fixedly mounted on the push rod floating plate. The push rod floating plate is fitted onto the push rod guide column through the push rod linear bearing and slides up and down with it. A push rod cylinder is fixedly mounted on the push rod cylinder mounting plate. The telescopic end of the push rod cylinder abuts against the bottom surface of the push rod floating plate. A push rod mounting fixture is fixedly mounted on the top surface of the push rod floating plate. The push rod is fixedly mounted on the push rod mounting fixture. A push rod clearance hole is provided on the base plate. The push rod cylinder drives the push rod floating plate to rise and fall smoothly along the push rod guide column, with a high degree of automation. The push rod linear bearing ensures smooth vertical sliding of the push rod floating plate without jamming. The push rod mounting fixture can stably fix the push rod. The cylinder power output is uniform and stable, and can synchronously complete the lifting and following pressing actions of the flange rotor assembly. The push rod guide column constrains the push rod running trajectory to avoid deviation during the push rod pushing process, prevent the flange rotor assembly from being tilted by force, and reduce the risk of damage to parts by collision and squeezing. The overall pushing structure has strong support rigidity and can maintain stable pushing and positioning accuracy even during long-term operation.

[0014] Preferably, an upper fixture mounting base is fixed on the bottom surface of the movable plate, an upper fixture mounting plate is fixedly mounted on the upper fixture mounting base, an upper fixture floating plate is movably mounted below the upper fixture mounting plate, a plurality of upper fixture linear bearings are fixed on the upper fixture mounting plate, an upper fixture guide post matching the upper fixture linear bearing is fixed on the top surface of the upper fixture floating plate, the upper fixture guide post passes through the upper fixture linear bearing and slides vertically with it, a second spring is sleeved on the outside of the upper fixture guide post, the two ends of the second spring abut against the lower end of the upper fixture linear bearing and the top surface of the upper fixture floating plate respectively, and an upper fixture limiting washer for limiting is fixedly mounted on the top end of the upper fixture guide post. The upper fixture guide post and the upper fixture linear bearing work together to ensure smooth vertical sliding of the upper fixture floating plate. The second spring on the outside of the guide post provides elastic buffering during press fitting and avoids damage to the workpiece from hard impacts. The upper fixture limiting shim at the top of the guide post can prevent the upper fixture guide post from coming out of the upper fixture linear bearing, preventing the floating structure from separating and failing. The entire floating buffer structure is evenly stressed, effectively absorbs the impact of press fitting, stably maintains the rotor alignment accuracy, and improves the overall assembly reliability.

[0015] This invention also provides an assembly method for an automotive steering motor rotor-stator assembly machine, comprising the following steps: Step 1: Pre-assembly and pre-treatment of workpieces: The housing stator assembly and the flange rotor assembly are placed in the stator fixture and rotor placement notch, respectively, and positioned by the flange positioning pins; the housing stator assembly is selectively heated according to the assembly mode; the flange rotor assembly is transferred to the assembly station, and the stator clamping fixture clamps the housing stator assembly. Step 2, Rotor Transfer: The upper fixture floating plate moves downward, the flange positioning pin aligns with the flange positioning pin and compresses the first spring; the push rod lifts the flange rotor assembly, transferring it to the flange positioning pin and compressing the second spring, and the first moving plate slides back to its original position. Step 3, Synchronous Follow-up Pressing: The floating plate of the upper fixture continues to press down, and the push rod moves down synchronously to press the flange rotor assembly into the machine housing stator assembly; Step 4: Reset and Unload: After pressing is completed, reset each mechanism, loosen the stator assembly of the housing, and take out the assembled motor assembly.

[0016] This assembly method involves first pre-assembling the workpiece, selectively heating and clamping it at the workstation, and then using the flange positioning pins and flange positioning columns to achieve a smooth rotor transfer. The assembly is completed by relying on the upper and lower double-layer spring floating structure and the push rod synchronously following the press fitting. The process is compact and orderly, and it can be compatible with both interference fit assembly and room temperature assembly. It effectively improves the alignment accuracy of the rotor and stator, reduces the risk of assembly collisions, and improves assembly stability and production efficiency.

[0017] The beneficial effects of this invention are: improved positioning accuracy, effectively preventing rotor assembly misalignment and scratching of stator windings and core; buffering assembly impact force, reducing the risk of component extrusion deformation and damage, and ensuring stable assembly quality; adaptable to both interference fit assembly and no-heating gap assembly conditions; improved finished product assembly consistency, simplified assembly operation process, and reduced manual operation intensity; improved clamping stability of the housing and stator assembly; effectively avoided heating position deviation, stator local overheating or insufficient heating caused by manual adjustment, smooth sliding fit structure movement, and high positioning repeatability; ensured assembly coaxiality and finished product yield; stably guaranteed rotor transfer alignment accuracy; the overall jacking structure has strong support rigidity and can maintain stable jacking positioning accuracy even during long-term operation; improved controllability of the pressing process and finished product qualification rate; effectively absorbed pressing impact, stably maintained rotor alignment accuracy, and improved overall assembly reliability. Attached Figure Description

[0018] Figure 1 This is a perspective view of the invention from a top view in the front direction; Figure 2 This is a perspective view of the invention from a top view from the rear side. Figure 3 yes Figure 2 A schematic diagram of the structure without the housing stator assembly and flange rotor assembly placed in the middle; Figure 4 This is a perspective view of the invention from a rearward position; Figure 5 This is a front view of the present invention; Figure 6 This is a left view of the present invention; Figure 7 This is a rear view of the present invention; Figure 8 yes Figure 6 Sectional view at point AA; Figure 9 yes Figure 6 Sectional view at point BB; Figure 10 It is a three-dimensional view of the stator assembly of the machine casing; Figure 11 This is a three-dimensional view of a flange rotor assembly; Figure 12 This is a picture of the finished product after the housing stator assembly and flange rotor assembly are assembled.

[0019] In the diagram: 1. Base plate, 2. Stator fixture, 3. Rotor fixture, 4. Heating assembly, 5. Heating coil, 6. Rotor placement notch, 7. Flange positioning pin, 8. First moving plate, 9. First spring, 10. Top rod, 11. Movable plate, 12. Upper fixture mounting plate, 13. Upper fixture floating plate, 14. Second spring, 15. Flange positioning post, 16. Stator clamping cylinder, 17. Stator clamping fixture, 18. Second moving plate, 19. Heating assembly linear guide rail, 20. Heating assembly slider, 21. Heating assembly forward and backward linear motor module, 22. Heating assembly up and down moving cylinder mounting plate, 23. Heating assembly up and down moving guide post, 24. Heating assembly up and down moving cylinder, 25. Heating assembly mounting plate, 26. Rotor assembly linear guide rail, 27. Rotor assembly slider, 28. Rotor assembly forward and backward linear motor module, 29. 30. Rotor jig linear bearing, 31. Rotor assembly guide post, 32. Rotor jig limiting gasket, 33. Push rod cylinder mounting plate, 34. Push rod guide post, 35. Push rod floating plate, 36. Push rod linear bearing, 37. Push rod cylinder, 38. Push rod mounting jig, 39. Top plate, 40. Movable plate guide post, 41. Movable plate linear bearing, 42. Servo electric cylinder, 43. Pressure sensor, 44. Upper jig mounting seat, 45. Upper jig linear bearing, 46. Upper jig guide post, 47. Upper jig limiting gasket, 48. Housing stator assembly, 49. Flange rotor assembly, 50. Photoelectric sensor, 61. Housing temperature detection sensor. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0021] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0022] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of components illustrated in these embodiments do not limit the scope of this application. For ease of illustration, spatial relative terms such as “upper,” “lower,” “left,” and “right” are used in the embodiments to describe the relationship of one element or feature shown in the figures relative to another element or feature. It should be understood that, in addition to the orientations shown in the figures, spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figures is inverted, an element described as being “below” other elements or features would be fixed “upper” to other elements or features. Thus, the exemplary term “lower” can include both upper and lower orientations. The device can be fixed in other ways (rotated 90 degrees or located in other orientations), and the spatial relative descriptions used herein can be interpreted accordingly. It should also be understood that, for ease of description, the dimensions of the various parts shown in the figures are not drawn to actual scale. Techniques, processes, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, processes, and equipment are part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be discussed further in subsequent figures.

[0023] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0024] like Figure 1 , Figure 2 , Figure 3 and Figure 4 In the embodiments described above, an automotive steering motor rotor-stator assembly machine includes: The base plate 1 is provided with a stator fixture 2, a rotor fixture 3 and a high-frequency heating assembly 4. The stator fixture 2 is fixedly assembled on the base plate 1 and is used to support and place the housing stator assembly 47. The rotor fixture 3 and the high-frequency heating assembly 4 are respectively arranged on the front and rear sides of the stator fixture 2 and are both in sliding cooperation with the base plate 1. The first movable plate 8 is slidably mounted on the base plate 1. The rotor fixture 3 is movably mounted on the first movable plate 8 and the two are connected by a first spring 9. The rotor fixture 3 has a rotor placement notch 6 on the side facing the stator fixture 2. A flange positioning pin 7 is fixed on the top surface of the rotor fixture 3. The flange positioning pin 7 is distributed on both sides of the rotor placement notch 6. The flange positioning pin 7 is adapted to the flange mounting hole on the flange rotor assembly 48 to position the flange rotor assembly 48. The rotor placement notch 6 is used to accommodate the rotor part on the flange rotor assembly 48. like Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9 As shown, the push rod 10 is mounted vertically on the base plate 1 and located directly below the stator fixture 2. The stator fixture 2 has a push rod clearance hole for the push rod 10 to pass through vertically and make clearance. Movable plate 11 is movably mounted above stator fixture 2. The bottom of movable plate 11 is provided with upper fixture floating plate 13. Upper fixture floating plate 13 is movably mounted on movable plate 11 and connected between the two by a second spring 14. The bottom surface of upper fixture floating plate 13 is fixed with flange positioning pins 15 corresponding to flange positioning pins 7. Flange positioning pins 15 are adapted to be inserted into flange mounting holes on flange rotor assembly 48. like Figure 6 As shown, a top plate 38 is provided above the movable plate 11. The top plate 38 and the bottom plate 1 are fixedly connected by several movable plate guide columns 39. Movable plate linear bearings 40 that match the movable plate guide columns 39 are fixedly mounted on the movable plate 11. The movable plate 11 is fitted onto the movable plate guide columns 39 through the movable plate linear bearings 40 and slides up and down with them. A servo electric cylinder 41 is fixedly mounted on the top plate 38. A pressure sensor 42 is fixedly mounted on the top surface of the movable plate 11. The telescopic end of the servo electric cylinder 41 is fixedly mounted on the pressure sensor 42.

[0025] like Figure 2 As shown, a photoelectric sensor 49 for real-time detection of whether there are workpieces in the fixture is fixedly mounted on the base plate 1. The equipment can only be started and operated after both types of workpieces are in place.

[0026] like Figure 2As shown, a stator clamping cylinder fixing block is fixedly mounted on the base plate 1. The stator clamping cylinder fixing blocks are symmetrically arranged on the left and right sides of the stator fixture 2. A stator clamping cylinder 16 is fixedly mounted on the stator clamping cylinder fixing block. The telescopic end of the stator clamping cylinder 16 faces the stator fixture 2 and a stator clamping fixture 17 is fixed on it for clamping the stator assembly 47 of the machine housing. The side of the stator clamping fixture 17 facing the stator fixture 2 is set as an arc-shaped clamping surface and has several toothed grooves.

[0027] like Figure 1 As shown, a second movable plate 18 is slidably mounted on the base plate 1, and a high-frequency heating component 4 is slidably mounted on the top surface of the second movable plate 18. A heating component linear guide rail 19 is fixed on the base plate 1, and a heating component slider 20 is fixed on the bottom surface of the second movable plate 18. The second movable plate 18 is slidably mounted on the base plate 1 through the cooperation of the heating component slider 20 and the heating component linear guide rail 19. A heating component forward and backward moving linear motor module 21 is also fixedly mounted on the base plate 1. The heating component forward and backward moving linear motor module 21 is connected to the second movable plate 18 for driving the second movable plate 18 to slide forward and backward along the heating component linear guide rail 19.

[0028] like Figure 1 As shown, a heating component vertical movement cylinder mounting plate 22 is provided above the second movable plate 18. The heating component vertical movement cylinder mounting plate 22 and the second movable plate 18 are fixedly connected by several heating component vertical movement guide columns 23. A heating component vertical movement cylinder 24 is fixedly mounted on the heating component vertical movement cylinder mounting plate 22. The telescopic end of the heating component vertical movement cylinder 24 faces the second movable plate 18 and a heating component mounting plate 25 is fixed on it. The heating component mounting plate 25 has guide column through holes that match the heating component vertical movement guide columns 23. The heating component mounting plate 25 is fitted onto the heating component vertical movement guide columns 23 through the guide column through holes and is slidably assembled with them. A high-frequency heating component 4 is fixedly mounted on the heating component mounting plate 25. A high-frequency heating coil 5 is provided on the side of the high-frequency heating component 4 facing the stator fixture 2 for heating the stator assembly 47 of the machine housing.

[0029] like Figure 2 As shown, a housing temperature detection sensor 50 for real-time detection of the temperature of the housing stator assembly 47 is fixedly mounted on the base plate 1. After heating to the set temperature, the high-frequency heating assembly 4 automatically returns to the standby position.

[0030] like Figure 2As shown, a rotor assembly linear guide rail 26 is fixed on the base plate 1, and a rotor assembly slider 27 is fixed on the bottom surface of the first moving plate 8. The first moving plate 8 is slidably assembled on the base plate 1 through the cooperation of the rotor assembly slider 27 and the rotor assembly linear guide rail 26. A rotor assembly forward and backward movement linear motor module 28 is also fixedly assembled on the base plate 1. The rotor assembly forward and backward movement linear motor module 28 is connected to the first moving plate 8 for driving the first moving plate 8 to slide forward and backward along the rotor assembly linear guide rail 26.

[0031] like Figure 6 As shown, a plurality of rotor fixture linear bearings 29 are fixedly mounted on the rotor fixture 3. A rotor assembly guide post 30 matching the rotor fixture linear bearings 29 is fixed on the top surface of the first moving plate 8. The rotor fixture linear bearings 29 are fitted on the rotor assembly guide post 30 and slide up and down with it. A first spring 9 is sleeved on the outside of the rotor assembly guide post 30. The two ends of the first spring 9 abut against the lower end of the rotor fixture linear bearings 29 and the top surface of the first moving plate 8, respectively. A rotor fixture limiting shim 31 for limiting is fixedly mounted on the top end of the rotor assembly guide post 30.

[0032] like Figure 6 As shown, a push rod cylinder mounting plate 32 is provided below the base plate 1. The push rod cylinder mounting plate 32 is fixedly connected to the base plate 1 by several push rod guide columns 33. A push rod floating plate 34 is also provided between the push rod cylinder mounting plate 32 and the base plate 1. A push rod linear bearing 35 matching the push rod guide column 33 is fixedly mounted on the push rod floating plate 34. The push rod floating plate 34 is fitted on the push rod guide column 33 through the push rod linear bearing 35 and slides up and down with it. A push rod cylinder 36 is fixedly mounted on the push rod cylinder mounting plate 32. The telescopic end of the push rod cylinder 36 abuts against the bottom surface of the push rod floating plate 34. A push rod mounting fixture 37 is fixedly mounted on the top surface of the push rod floating plate 34. The push rod 10 is fixedly mounted on the push rod mounting fixture 37. A push rod clearance hole is provided on the base plate 1 for the push rod 10 to pass through vertically and avoid interference.

[0033] like Figure 6 As shown, an upper fixture mounting base 43 is fixed on the bottom surface of the movable plate 11. An upper fixture mounting plate 12 is fixedly mounted on the upper fixture mounting base 43. An upper fixture floating plate 13 is movably mounted below the upper fixture mounting plate 12. Several upper fixture linear bearings 44 are fixed on the upper fixture mounting plate 12. An upper fixture guide post 45 matching the upper fixture linear bearings 44 is fixed on the top surface of the upper fixture floating plate 13. The upper fixture guide post 45 passes through the upper fixture linear bearings 44 and slides vertically with them. A second spring 14 is sleeved on the outside of the upper fixture guide post 45. The two ends of the second spring 14 abut against the lower end of the upper fixture linear bearings 44 and the top surface of the upper fixture floating plate 13, respectively. An upper fixture limiting gasket 46 for limiting is fixedly mounted on the top end of the upper fixture guide post 45.

[0034] This invention also provides an assembly method for an automotive steering motor rotor-stator assembly machine, comprising the following steps: Step 1, Workpiece Pre-assembly and Pre-treatment: Machine Housing Stator Assembly 47 (e.g.) Figure 10 As shown), flange rotor assembly 48 (as shown) Figure 11 (As shown) are placed in stator fixture 2 and rotor placement notch 6 respectively, and positioned by flange positioning pin 7; the housing stator assembly 47 is selectively heated according to the assembly mode; the flange rotor assembly 48 is transferred to the assembly station, and the stator clamping fixture 17 clamps the housing stator assembly 47. Step 2, Rotor Transfer: The upper fixture floating plate 13 moves downward, the flange positioning pin 15 aligns with the flange positioning pin 7 and compresses the first spring 9; the push rod 10 lifts the flange rotor assembly 48, transferring it to the flange positioning pin 15 and compressing the second spring 14, and the first moving plate 8 slides back to its original position. Step 3, Synchronous follow-up pressing: The upper jig floating plate 13 continues to press down, and the push rod 10 moves down synchronously to press the flange rotor assembly 48 into the machine housing stator assembly 47. Step 4: Reset and Unload: After pressing, reset all mechanisms, loosen the stator assembly 47 of the housing, and remove the assembled motor assembly (e.g., Figure 12 (As shown).

[0035] Specific workflow: During assembly, the operator places the housing stator assembly 47 on the stator fixture 2, and then places the rotor part of the flange rotor assembly 48 into the rotor placement notch 6. The pre-installation positioning is completed by relying on the flange positioning pin 7 and the flange assembly hole. The equipment is only allowed to start after the photoelectric sensor 49 detects that both workpieces are in place.

[0036] The operator selects the assembly mode according to the production requirements. If the interference heating assembly process is performed, the linear motor module 21 of the heating component moves back and forth, driving the second moving plate 18 to slide forward, delivering the high-frequency heating component 4 to the top of the housing stator assembly 47. The heating component moving cylinder 24 pushes the heating component mounting plate 25 downward, adjusting the heating coil 5 to a suitable heating height, and then the heating operation is started. The housing temperature detection sensor 50 collects the temperature value in real time. When the temperature reaches the set value, the high-frequency heating component 4 first rises and then moves back to the standby position. If it is a gap assembly process, all heating steps are skipped directly.

[0037] After the workpiece heating process is completed, the linear motor module 28 of the rotor assembly moves back and forth, driving the first moving plate 8 to slide forward and transport the flange rotor assembly to the position between the housing stator assembly 47 and the upper fixture floating plate. The stator clamping cylinders 16 on the left and right sides extend synchronously, driving the stator clamping fixture 17 to firmly clamp the housing stator assembly 47, locking the position of the housing stator assembly 47, and ensuring that the assembly reference will not shake or shift.

[0038] Servo cylinder 41 begins to push the movable plate 11 downwards. The movable plate 11 descends vertically along the movable plate guide post 39, causing the upper fixture floating plate to move downwards as well. When the flange positioning post 15 at the bottom of the upper fixture floating plate 13 and the flange positioning pin 7 below are in contact and connected, continued downward pressure will compress the first spring 9, forming a lower end buffer. Immediately afterwards, the push rod cylinder 36 pushes the push rod floating plate 34 upwards, and the push rod 10 lifts the flange rotor assembly 48 upwards, allowing the flange mounting hole to disengage from the flange positioning pin 7 and be fully fitted onto the flange positioning post 15. During the upward movement of the upper fixture floating plate 13, the second spring 14 is compressed simultaneously, constructing a double-layer buffer structure. After the flange rotor assembly 48 completes the position transfer, the first moving plate 8 retracts to the standby position, making room for pressing.

[0039] After the rotor fixture 3 retracts, the servo cylinder 41 continues to feed downwards, the pressure sensor 42 collects the pressing load in real time, the push rod cylinder 36 retracts slowly and synchronously, and the push rod 10 follows the pressing stroke downwards, always supporting the flange rotor assembly 48 to maintain a coaxial posture, smoothly pressing the flange rotor assembly 48 into the stator assembly 47 of the machine housing, avoiding hard impacts that could cause scratches to the parts. After the entire pressing process is completed, the servo cylinder 41 drives the movable plate 11 to rise and reset, the push rod cylinder 36 drives the push rod 10 to descend and return to its original position, the stator clamping cylinder 16 retracts the stator clamping fixture 17, the assembled motor assembly is released, the operator removes the finished product, and the whole machine returns to its initial standby state, waiting for the next round of workpiece assembly operations.

[0040] This equipment achieves multiple technological advantages through overall structural matching and automated process optimization: Firstly, relying on the automated moving mechanism composed of the linear motor module 21 for forward and backward movement of the heating component and the cylinder 24 for up and down movement of the heating component, the heating coil 5 can be automatically moved to the preset heating position of the stator assembly 47 according to the program. After heating, it automatically returns to the standby position, effectively ensuring uniform heating position and uniform stator heating each time, avoiding problems such as uneven heating and local overheating caused by manual adjustment deviations, greatly simplifying the heating preparation process, and improving the overall efficiency and process stability of heat fitting assembly; Secondly, relying on the linear motor module 28 for forward and backward movement of the rotor assembly to complete the rotor workpiece transportation, it can ensure precise coaxial alignment of the flange rotor assembly 48 and the stator assembly 47 before assembly, effectively avoiding the defects of manual assembly alignment deviations that can easily scratch the stator windings and core; at the same time, the servo cylinder 41 and the pressure sensor 42 cooperate to achieve closed-loop control of pressing pressure and pressing stroke, which can identify abnormal assembly resistance in real time and protect and stop the machine in time, effectively To prevent quality problems such as workpiece extrusion deformation and breakage during the pressing process, the equipment significantly improves assembly safety and finished product yield. Thirdly, it can switch between different operating modes. In heat-fitting mode, the high-frequency heating component 4 automatically starts to perform the stator heating process. In gap assembly mode, the high-frequency heating component 4 can be automatically shielded from related actions, while the remaining positioning, transfer, and pressing processes operate normally. Process switching does not require tooling changes or mechanical structure adjustments. The equipment has strong flexible production capabilities and can adapt to multi-specification motor mixed-line production, R&D trial production, and small-batch multi-variety production scenarios, greatly improving its versatility and adaptability. Fourthly, operators only need to place the workpiece and select the mode; the equipment can automatically complete the entire process of heating, stator clamping cylinder 16 clamping the workpiece, rotor transfer, flexible pressing, and automatic reset unloading. This eliminates the drawbacks of traditional assembly relying on manual experience, cumbersome operation, and large human error. Simultaneously, the equipment can automatically store assembly process data, enabling traceability of product assembly quality, facilitating subsequent process iteration and optimization, and further stabilizing and improving overall assembly quality.

[0041] It should be noted that the high-frequency heating component 4, stator clamping cylinder 16, heating component forward and backward linear motor module 21, heating component up and down linear motor module 24, rotor component forward and backward linear motor module 28, push rod cylinder 36, servo electric cylinder 41, pressure sensor 42, photoelectric sensor 49, and housing temperature detection sensor 50 in this equipment are all mature existing technology devices in the field. Their structural principles, electrical wiring, control methods, and installation and debugging methods are all conventional technical means in the field and are not the focus of improvement in this application. Therefore, they will not be elaborated here. The innovation of this application lies in combining each standard device with a self-designed fixture structure, floating buffer structure, and follow-up pressing process, and bringing the above advantages through overall structural matching and automated process optimization.

[0042] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A rotor-stator assembly machine for an automotive steering motor, characterized in that, include: The base plate (1) is provided with a stator fixture (2), a rotor fixture (3) and a heating assembly (4). The stator fixture (2) is fixedly assembled on the base plate (1). The rotor fixture (3) and the heating assembly (4) are respectively arranged on the front and rear sides of the stator fixture (2) and both slide in a front-to-back manner with the base plate (1). The first movable plate (8) is slidably mounted on the base plate (1). The rotor fixture (3) is movably mounted on the first movable plate (8) and a first spring (9) is connected between them. The rotor fixture (3) has a rotor placement notch (6) on the side facing the stator fixture (2). A flange positioning pin (7) is fixed on the top surface of the rotor fixture (3). The flange positioning pin (7) is distributed on both sides of the rotor placement notch (6). Top rod (10), the top rod (10) is movably mounted on the base plate (1) and located directly below the stator fixture (2), the stator fixture (2) is provided with a top rod clearance hole; Movable plate (11), which is movably disposed above the stator fixture (2), and the bottom of the movable plate (11) is provided with an upper fixture floating plate (13), which is movably assembled on the movable plate (11) and connected to the two by a second spring (14), and the bottom surface of the upper fixture floating plate (13) is fixed with a flange positioning pin (15) corresponding to the flange positioning pin (7). A top plate (38) is provided above the movable plate (11). The top plate (38) and the bottom plate (1) are fixedly connected by several movable plate guide columns (39). A movable plate linear bearing (40) matching the movable plate guide column (39) is fixedly mounted on the movable plate (11). The movable plate (11) is fitted on the movable plate guide column (39) through the movable plate linear bearing (40) and slides up and down with it. A servo electric cylinder (41) is fixedly mounted on the top plate (38). A pressure sensor (42) is fixedly mounted on the top surface of the movable plate (11). The telescopic end of the servo electric cylinder (41) is fixedly mounted on the pressure sensor (42).

2. The automotive steering motor rotor-stator assembly machine according to claim 1, characterized in that, A stator clamping cylinder fixing block is fixedly mounted on the base plate (1). The stator clamping cylinder fixing block is symmetrically arranged on the left and right sides of the stator fixture (2). A stator clamping cylinder (16) is fixedly mounted on the stator clamping cylinder fixing block. The telescopic end of the stator clamping cylinder (16) faces the stator fixture (2) and a stator clamping fixture (17) is fixed on it. The side of the stator clamping fixture (17) facing the stator fixture (2) is set as an arc-shaped clamping surface and has several toothed grooves.

3. The automotive steering motor rotor-stator assembly machine according to claim 1, characterized in that, The base plate (1) is slidably mounted with a second moving plate (18) in the front and back. The heating component (4) is slidably mounted on the top surface of the second moving plate (18). The base plate (1) is fixed with a heating component linear guide rail (19). The bottom surface of the second moving plate (18) is fixed with a heating component slider (20). The second moving plate (18) is slidably mounted on the base plate (1) through the cooperation of the heating component slider (20) and the heating component linear guide rail (19). The base plate (1) is also fixedly mounted with a heating component front and back moving linear motor module (21). The heating component front and back moving linear motor module (21) is connected to the second moving plate (18) for driving the second moving plate (18) to slide back and forth along the heating component linear guide rail (19). The heating component (4) is provided with a heating coil (5) on the side facing the stator fixture (2).

4. The automotive steering motor rotor-stator assembly machine according to claim 3, characterized in that, A heating component vertical movement cylinder mounting plate (22) is provided above the second movable plate (18). The heating component vertical movement cylinder mounting plate (22) and the second movable plate (18) are fixedly connected by several heating component vertical movement guide columns (23). A heating component vertical movement cylinder (24) is fixedly mounted on the heating component vertical movement cylinder mounting plate (22). The telescopic end of the heating component vertical movement cylinder (24) faces the second movable plate (18) and a heating component mounting plate (25) is fixed on it. The heating component mounting plate (25) has a guide column through hole that matches the heating component vertical movement guide column (23). The heating component mounting plate (25) is fitted onto the heating component vertical movement guide column (23) through the guide column through hole and slides vertically with it. The heating component (4) is fixedly mounted on the heating component mounting plate (25).

5. The automotive steering motor rotor-stator assembly machine according to claim 1, characterized in that, The base plate (1) is fixed with a rotor assembly linear guide rail (26), and the bottom surface of the first moving plate (8) is fixed with a rotor assembly slider (27). The first moving plate (8) is slidably mounted on the base plate (1) through the cooperation of the rotor assembly slider (27) and the rotor assembly linear guide rail (26). The base plate (1) is also fixedly mounted with a rotor assembly forward and backward moving linear motor module (28). The rotor assembly forward and backward moving linear motor module (28) is connected to the first moving plate (8) for driving the first moving plate (8) to slide forward and backward along the rotor assembly linear guide rail (26).

6. The automotive steering motor rotor-stator assembly machine according to claim 5, characterized in that, A plurality of rotor fixture linear bearings (29) are fixedly mounted on the rotor fixture (3). A rotor assembly guide post (30) matching the rotor fixture linear bearings (29) is fixed on the top surface of the first moving plate (8). The rotor fixture linear bearings (29) are fitted on the rotor assembly guide post (30) and slide up and down with it. The first spring (9) is fitted on the outside of the rotor assembly guide post (30). The two ends of the first spring (9) respectively abut against the lower end of the rotor fixture linear bearings (29) and the top surface of the first moving plate (8). A rotor fixture limiting shim (31) for limiting is fixedly mounted on the top end of the rotor assembly guide post (30).

7. The automotive steering motor rotor-stator assembly machine according to claim 2, characterized in that, A push rod cylinder mounting plate (32) is provided below the base plate (1). The push rod cylinder mounting plate (32) is fixedly connected to the base plate (1) by a number of push rod guide columns (33). A push rod floating plate (34) is also provided between the push rod cylinder mounting plate (32) and the base plate (1). A push rod linear bearing (35) matching the push rod guide column (33) is fixedly mounted on the push rod floating plate (34). The push rod floating plate (34) is connected to the push rod linear shaft. The support (35) is fitted onto the push rod guide column (33) and slides up and down with it. The push rod cylinder (36) is fixedly mounted on the push rod cylinder mounting plate (32). The telescopic end of the push rod cylinder (36) abuts against the bottom surface of the push rod floating plate (34). The push rod mounting fixture (37) is fixedly mounted on the top surface of the push rod floating plate (34). The push rod (10) is fixedly mounted on the push rod mounting fixture (37). The bottom plate (1) has a push rod clearance hole.

8. The automotive steering motor rotor-stator assembly machine according to claim 1, characterized in that, An upper fixture mounting base (43) is fixed on the bottom surface of the movable plate (11). An upper fixture mounting plate (12) is fixedly mounted on the upper fixture mounting base (43). An upper fixture floating plate (13) is movably mounted below the upper fixture mounting plate (12). A plurality of upper fixture linear bearings (44) are fixed on the upper fixture mounting plate (12). An upper fixture floating plate (13) with matching upper fixture linear bearings (44) is fixed on the top surface of the upper fixture floating plate (13). The upper fixture has a guide post (45), which passes through the upper fixture linear bearing (44) and slides up and down with it. The second spring (14) is sleeved on the outside of the upper fixture guide post (45). The two ends of the second spring (14) abut against the lower end of the upper fixture linear bearing (44) and the top surface of the upper fixture floating plate (13), respectively. The top end of the upper fixture guide post (45) is fixedly equipped with an upper fixture limiting gasket (46) for limiting.

9. An assembly method using the automotive steering motor rotor-stator assembly machine as described in claim 2, characterized in that, Includes the following steps: Step 1: Pre-assembly and pre-treatment of workpieces: The housing stator assembly (47) and the flange rotor assembly (48) are placed in the stator fixture (2) and the rotor placement notch (6) respectively, and positioned by the flange positioning pin (7); the housing stator assembly (47) is selectively heated according to the assembly mode; the flange rotor assembly (48) is transferred to the assembly station, and the stator clamping fixture (17) clamps the housing stator assembly (47); Step 2, Rotor transfer: The upper fixture floating plate (13) moves down, the flange positioning pin (15) connects with the flange positioning pin (7) and compresses the first spring (9); the push rod (10) lifts the flange rotor assembly (48) so that it is transferred to the flange positioning pin (15) and compresses the second spring (14), and the first moving plate (8) slides back to its original position; Step 3, Synchronous follow-up pressing: The upper jig floating plate (13) continues to press down, and the push rod (10) moves down synchronously to press the flange rotor assembly (48) into the machine housing stator assembly (47); Step 4, Reset and Unload: After pressing is completed, reset each mechanism, loosen the stator assembly (47) of the housing, and take out the assembled motor assembly.

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