A motor assembly for a food processor

Abstract

The application provides a motor assembly for a food processor, comprising a motor shaft, a first driving structure connected with the motor shaft, and a second driving structure coaxially sleeved on the periphery of the first driving structure, wherein the second driving structure is connected with the motor shaft through a speed reduction mechanism, the speed reduction mechanism comprises a housing, a planetary support, a plurality of double gears, a sun gear and a movable inner ring gear are arranged in the housing and cooperate with each other, the plurality of double gears are arranged on the planetary support and are uniformly distributed in the housing, the double gear comprises a large gear and a small gear which are coaxially and integrally connected, the large gear is respectively engaged with the sun gear and a fixed inner ring gear on the housing, and the small gear is engaged with the movable inner ring gear, the first driving structure is arranged at the output end of the planetary support, and the second driving structure is arranged at the output end of the movable inner ring gear. The motor assembly of the application runs stably, realizes coaxial high-low speed output, and improves the processing adaptability of the food processor to different food materials.

Description

Technical Field

[0001] This invention relates to the field of household appliance technology, specifically to a motor assembly for a food processing machine. Background Technology

[0002] Existing food processor motor assemblies include a motor shaft, a first drive structure connected to the motor shaft, and a second drive structure coaxially sleeved around the first drive structure. The first drive structure is connected to the second drive structure via a reduction gear, enabling the motor assembly to provide coaxial dual-speed output, thus improving the food processor's adaptability to processing different ingredients. However, for applications requiring strong low-speed load capacity, such as dough kneading, the low-speed load capacity of the second drive structure, which only undergoes a single-stage reduction relative to the motor shaft speed, is insufficient to meet kneading requirements, resulting in poor dough formation or even failure to form a dough. To address these technical issues, existing technologies utilize two planetary gear mechanisms stacked vertically within the reduction gearbox for two-stage reduction of the second drive structure, thereby improving its low-speed load capacity. However, the use of multiple planetary gear mechanisms results in a complex motor assembly structure and excessive size. Furthermore, due to the spatial layout and installation space limitations of each structure within the gearbox housing, the two adjacent planetary gears in the two planetary gear mechanisms are misaligned and poorly distributed within the gearbox housing. This easily leads to unstable transmission during operation, resulting in poor running stability of the motor assembly. Especially under low-speed load driving conditions, prolonged use will cause wear on the planetary gear teeth and vibration of the drive mechanism, resulting in significant noise and reduced service life of the motor assembly. Summary of the Invention

[0003] The purpose of this invention is to provide a motor assembly for a food processing machine, so as to solve the technical problems of existing motor assemblies in food processing machines being large in size, complex in structure, and low in operational reliability.

[0004] To achieve the above objectives, the present invention provides a motor assembly for a food processing machine, comprising a motor shaft, a first drive structure connected to the motor shaft, and a second drive structure coaxially sleeved on the outer periphery of the first drive structure. The second drive structure is connected to the motor shaft via a reduction mechanism. The reduction mechanism includes a housing, within which are disposed a planetary support, a plurality of double gears, a sun gear, and a movable internal gear ring. The plurality of double gears are disposed on the planetary support and evenly distributed within the housing. Each double gear includes a large gear and a small gear coaxially and integrally connected. The large gear meshes with the sun gear and a fixed internal gear ring on the housing, respectively, and the small gear meshes with the movable internal gear ring. The first drive structure is located at the output end of the planetary support, and the second drive structure is located at the output end of the movable internal gear ring.

[0005] Optionally, the difference in the number of teeth between the fixed internal gear ring and the movable internal gear ring is an integer multiple N of the number of double gears, where N≤3.

[0006] Optionally, the tip circle diameter of the pinion is not greater than the root circle diameter of the gear.

[0007] Optionally, the tooth width of the pinion is not less than the tooth width of the gear.

[0008] Optionally, the outer wall of the first driving structure and the inner wall of the second driving structure form a wedge-shaped gap with a gradually decreasing cross-section from the inside to the outside.

[0009] Optionally, a first bearing is provided between the first drive structure and the movable internal gear ring, and a second bearing is provided between the movable internal gear ring and the housing. One end of the first bearing abuts against the planetary support, and the other end abuts against the movable internal gear ring.

[0010] Optionally, one end of the second bearing abuts against the movable internal gear ring, and the other end abuts against the housing.

[0011] Optionally, the outer side wall of the movable internal gear ring is provided with a flange, and the inner side wall of the housing is provided with a sliding groove that mates with the flange.

[0012] Optionally, there is a gap between the planetary support and the movable internal gear ring, and a wear-resistant pad is provided in the gap.

[0013] Optionally, the housing includes a first housing and a second housing that are detachably connected, wherein the inner sidewall of the first housing is provided with internal teeth in the circumferential direction to form a fixed internal tooth ring.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] 1. This application simplifies the two-stage reduction mechanism by mounting multiple double gears on a planetary support and distributing them evenly within the housing of the reduction structure. The larger gear on each double gear meshes with the sun gear and the fixed internal gear ring on the housing, while the smaller gear meshes with the movable internal gear ring. This achieves a compact and miniaturized motor assembly. Furthermore, because the multiple double gears are evenly distributed within the housing of the reduction mechanism, and the larger and smaller gears are coaxially connected, the coaxiality of the upper and lower reduction gears is ensured. This results in balanced forces on the upper and lower reduction gears during rotation, thereby minimizing stress during gear transmission. The offset reduces motor component vibration, especially under high low-speed load conditions, increasing transmission smoothness and efficiency, thereby ensuring smooth motor component operation and extending motor component lifespan. Simultaneously, the first drive structure is located at the output end of the planetary support, and the second drive structure is located at the output end of the movable internal gear ring, enabling the motor component to achieve coaxial high and low speed output. This improves the food processor's adaptability to processing different ingredients and enhances the operational reliability of the first and second drive structures under various processing conditions, ultimately improving the processing effect and user experience of the food processor.

[0016] 2. By making the difference in the number of teeth between the fixed internal gear ring and the movable internal gear ring an integer multiple N of the number of double gears, and N not exceeding 3, this application not only enables the second drive structure to have a sufficiently large torque to adapt to processing conditions requiring a large low-speed load capacity, such as dough kneading, thereby improving the processing effect and efficiency of the food processing machine, but also reduces the tooth surface contact stress during gear meshing, improves transmission smoothness and efficiency, reduces the risk of gear damage, and extends the service life of the motor assembly.

[0017] 3. In processing conditions requiring a large low-speed load capacity, the second drive structure is prone to wobbling due to the large load impact force, causing the double gear to move up and down. This application avoids the problem of the small gear tooth surface colliding and jamming with the fixed internal gear ring, which would damage the motor assembly, by ensuring that the tooth tip circle diameter of the small gear is not larger than the tooth root circle diameter of the large gear.

[0018] 4. This application ensures that the tooth width of the pinion is not less than that of the gear, thereby guaranteeing an effective meshing contact area between the tooth surface of the pinion and the tooth surface of the movable internal gear ring. This increases the output torque, enhances the low-speed load capacity, improves the mechanical strength of the pinion tooth surface, extends the service life of the double gear, and extends the service life of the motor assembly.

[0019] 5. In this application, the outer sidewall of the first drive structure and the inner sidewall of the second drive structure form a wedge-shaped gap with a gradually decreasing cross-section from the inside to the outside. This not only facilitates the assembly between the first drive structure and the second drive structure and improves assembly efficiency, but also enables radial limiting of the first drive structure, reduces radial sway of the first drive structure, and ensures the transmission reliability of the first drive structure.

[0020] 6. This application provides a first bearing between the first drive structure and the movable internal gear ring, and a second bearing between the movable internal gear ring and the housing. This not only ensures the smooth rotation of the first drive structure and the movable internal gear ring, but also radially limits the first drive structure and the movable internal gear ring, preventing radial wobble and improving the stability of the transmission between the first drive structure and the second drive structure. At the same time, the first bearing abuts against the planetary support at one end and against the movable internal gear ring at the other end, improving the stability of the planetary support rotation and enhancing the reliability of the motor assembly operation.

[0021] 7. This application uses a second bearing to abut one end against the movable internal gear ring and the other end against the housing to axially limit the movable internal gear ring, reduce the axial wobble of the movable internal gear ring, improve the rotational smoothness of the movable internal gear ring, and improve the transmission smoothness of the second drive structure.

[0022] 8. This application provides a flange on the outer side wall of the movable internal gear ring and a groove on the inner side wall of the housing that mates with the flange. This further limits the radial movement of the movable internal gear ring, reduces its radial wobble, improves its rotational smoothness, and enhances the transmission smoothness of the second drive structure.

[0023] 9. During long-term use of the motor assembly, wear will occur on the contact surface between the planetary support and the first bearing, resulting in a gap between them. This causes the first bearing to come into contact with the planetary support, leading to axial wobble and interference between the planetary support and the movable internal gear ring. This application addresses this by providing a wear-resistant pad in the gap between the planetary support and the movable internal gear ring to reduce the rotational interference of the planetary support on the movable internal gear ring, ensuring the operational reliability of the motor assembly and extending its service life.

[0024] 10. The housing of this application includes a first housing and a second housing that are detachably connected. The inner sidewall of the first housing is provided with internal teeth along the circumferential direction to form a fixed internal gear ring, which not only ensures the transmission reliability between the large gear and the fixed internal gear ring, but also further simplifies the structure of the motor assembly and realizes the miniaturization of the motor assembly. Attached Figure Description

[0025] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings:

[0026] Figure 1 This is a schematic diagram of the overall structure of the food processing machine of the present invention;

[0027] Figure 2 This is a three-dimensional structural diagram of the body of the present invention;

[0028] Figure 3 This is a schematic diagram of the structure of the motor assembly of the present invention;

[0029] Figure 4 This is an exploded structural diagram of the motor assembly of the present invention;

[0030] Figure 5 This is a cross-sectional view of the motor assembly of the present invention;

[0031] Figure 6 This is a schematic diagram showing the distribution of the double gears in the housing of the present invention;

[0032] Figure 7 This is a schematic diagram of the structure of the double gear of the present invention;

[0033] Figure 8 This is a bottom view of the double gear of the present invention;

[0034] Figure 9 This is a front view of the double gear of the present invention;

[0035] Figure 10 This is a schematic diagram of the structure of the movable internal gear ring of the present invention;

[0036] Figure 11 This is a schematic diagram of the structure of the lower housing of the present invention.

[0037] Explanation of reference numerals in the attached figures:

[0038] 100 Body; 1 Motor assembly; 10 Reduction mechanism; 11 Sun gear; 121 Planetary shaft, 122 First planetary support, 123 Second planetary support, 1231 Output end, 1232 Support rib, 1233 First drive structure; 13 Double gear, 131 Large gear, 132 Small gear; 14 Movable internal gear ring, 141 Flange, 142 Support rib, 143 Second drive structure; 15 Housing, 151 First housing, 1511 Fixed internal gear ring, 152 Second housing, 1521 Slide groove; 16 First bearing; 17 Second bearing; 18 Wear-resistant pad; 19 Wedge gap; 20 Motor, 21 Motor shaft; 200 Cup lid; 300 Machined parts; 400 Stirring cup. Detailed Implementation

[0039] To more clearly illustrate the overall concept of the present invention, a detailed description will be provided below with reference to the accompanying drawings and examples.

[0040] It should be noted that many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0041] In the embodiments provided in this application, such as Figures 1 to 3 As shown, a food processing machine includes a body 100, a mixing cup 400 and a processing component 300 disposed in the mixing cup 400, a cup lid 200 covering the mixing cup 400, a motor assembly 1 for driving the processing component 300 and a housing for accommodating the motor assembly 1 inside the body 100. Figures 1 to 3 The schematic diagrams of the food processing machine, its body, and motor assembly shown are provided for ease of explanation and understanding. The following content is based on the illustrated product structure. It is understood by those skilled in the art that the above structures are merely specific examples and illustrative illustrations and do not constitute a specific limitation on the technical solutions provided in this application.

[0042] It should be noted that, Figure 1 The main body 1 can be placed on top of the mixing cup 400, or it can be placed below the mixing cup, depending on the design structure and shape of the product.

[0043] Specifically, such as Figures 3 to 7 As shown, this application provides a motor assembly 1 for a food processing machine, including a motor shaft 111, a first drive structure 1233 connected to the motor shaft 111, and a second drive structure 143 coaxially sleeved on the outer periphery of the first drive structure 1233. The second drive structure 143 is connected to the motor shaft 21 through a reduction mechanism 10. The reduction mechanism includes a housing 15, and the housing 15 is provided with a planetary support, a plurality of double gears 13, a sun gear 11, and a movable internal gear ring 14 that cooperate with each other. The plurality of double gears 13 are disposed on the planetary support and are evenly distributed in the housing 15. The double gears 13 include a large gear 131 and a small gear 132 coaxially and integrally connected. The large gear 131 meshes with the sun gear 11 and the fixed internal gear ring 1511 on the housing 15, respectively. The small gear 132 meshes with the movable internal gear ring 14. The first drive structure 1233 is disposed at the output end 1231 of the planetary support, and the second drive structure 143 is disposed at the output end of the movable internal gear ring 14.

[0044] This application simplifies the two-stage reduction structure of the reduction mechanism 10 by mounting multiple double gears 13 on a planetary support and distributing them evenly within the housing 15 of the reduction structure 10. The large gear 131 on each double gear 13 meshes with the sun gear 11 and the fixed internal gear ring 1511 on the housing 15, while the small gear 132 meshes with the movable internal gear ring 14. This achieves a compact and miniaturized structure for the motor assembly 1. Furthermore, because the multiple double gears 13 are evenly distributed within the housing 15 of the reduction mechanism 10, and the large gear 131 and small gear 132 of the double gears are coaxially connected, the coaxiality of the upper and lower reduction gears is ensured. This results in balanced force distribution during rotation, minimizing gear shift and reducing motor assembly vibration, especially under high low-speed load conditions. This increases transmission smoothness and efficiency, ensuring stable operation of the motor assembly and improving motor performance. The lifespan of the components is extended; meanwhile, the first drive structure 1233 is located at the output end 1231 of the planetary support. The output speed of the first drive structure 1233 is reduced by one level relative to the output speed of the motor shaft 21. It is used for functions such as mincing meat and chopping vegetables, and will not grind the ingredients too finely, thus affecting the taste. It can also reduce the splashing of ingredients caused by excessive speed, improving the user experience. The second drive structure 143 is located at the output end of the movable internal gear ring 14. The output speed of the second drive structure 143 is reduced by two levels relative to the output speed of the motor shaft 21. It can meet the working scenarios of low speed and high torque output, such as kneading dough. This enables the motor components to achieve coaxial high and low speed output, improves the adaptability of the food processor to the processing of different ingredients, and improves the operational reliability of the first drive structure 1233 and the second drive structure 143 in different processing conditions, thereby improving the processing effect of the food processor and the user experience.

[0045] like Figure 4 and 5 As shown, the planetary support includes a planetary shaft 121, a first planetary support 122, and a second planetary support 123. The planetary shaft 121 passes through a double gear 13 and is mounted on the planetary support. The first planetary support 122 and the second planetary support 123 clamp and fix the double gear 13. The first drive structure 1233 and the output end 1231 of the second planetary support 123 are integrally injection molded and located on the output end 1231.

[0046] It should be noted that the first drive structure 1233 can also be mounted on the output end 1231 of the second planetary support 123 by means of a fixing member.

[0047] It should be noted that the second drive structure 143 can be integrally formed with the output end of the movable internal gear ring 14, or it can be fixedly connected to the output end of the movable internal gear ring 14 through a fastener.

[0048] As a preferred embodiment of this application, such as Figure 5 As shown, the outer sidewall of the first driving structure 1233 and the inner sidewall of the second driving structure 143 form a wedge-shaped gap 19 with a gradually decreasing cross-section from the inside to the outside.

[0049] In the assembly process of the first drive structure 1233 and the second drive structure 143, the first drive structure 1233 is inserted into the second drive structure 143, and the outer side wall of the first drive structure 1233 and the inner side wall of the second drive structure 143 form a wedge-shaped gap 19 with a gradually decreasing cross-section from the inside to the outside. This not only facilitates the assembly between the first drive structure 1233 and the second drive structure 143 and improves the assembly efficiency, but also enables radial limiting of the first drive structure 1233, reduces the radial sway of the first drive structure 1233, and ensures the transmission reliability of the first drive structure 1233.

[0050] In the embodiments of this application, such as Figures 3 to 5 As shown, the housing 15 of the reduction mechanism 10 includes a first housing 151 and a second housing 152 that are detachably connected. The inner sidewall of the first housing 151 is provided with internal teeth along the circumferential direction to form a fixed internal gear ring 1511, which not only ensures the transmission reliability between the large gear 131 and the fixed internal gear ring 1511, but also further simplifies the structure of the motor assembly and realizes the miniaturization of the motor assembly.

[0051] It should be noted that a separate fixed internal gear ring 1511 may be provided inside the housing 15, and the fixed internal gear ring 1511 is fixedly connected to the inner wall of the housing 15 through a fastener.

[0052] In a preferred embodiment of this application, the difference in the number of teeth between the fixed internal gear ring and the movable internal gear ring 14 is an integer multiple N of the number of double gears 13, and N does not exceed 3. This not only enables the second drive structure 143 to have a sufficiently large torque to adapt to processing conditions that require a large low-speed load capacity, such as kneading dough, thereby improving the processing effect and efficiency of the food processing machine, but also reduces the contact stress on the tooth surface during gear meshing, improves transmission smoothness and efficiency, reduces the risk of gear damage, and extends the service life of the motor assembly 1.

[0053] As a preferred embodiment of this application, such as Figure 7 and 8 As shown, the tip circle diameter D1 of the pinion 132 is not greater than the root circle diameter D2 of the gear 131.

[0054] In processing conditions requiring a large low-speed load capacity, the second drive structure may wobble due to the large load impact force, causing the double gear to move up and down. This application avoids the problem of the tooth surface of the pinion 132 colliding and jamming with the fixed internal gear ring 1511, which would cause damage to the motor assembly 1, by ensuring that the tooth tip circle diameter D1 of the pinion 132 is not greater than the tooth root circle diameter D2 of the gear 131.

[0055] As a preferred embodiment of this application, such as Figure 9 As shown, the tooth width L1 of the pinion 132 is not less than the tooth width L2 of the gear 131, so as to ensure the effective meshing contact surface between the tooth surface of the pinion 132 and the tooth surface of the movable internal gear ring, increase the output torque, improve the low-speed load capacity, improve the mechanical strength of the tooth surface of the pinion 132, extend the service life of the double gear 13, and extend the service life of the motor assembly.

[0056] As a preferred embodiment of this application, such as Figure 5 As shown, a first bearing 16 is provided between the first drive structure 1233 and the movable internal gear ring 14, and a second bearing 17 is provided between the movable internal gear ring 14 and the housing 15. This not only ensures the smooth rotation of the first drive structure 1233 and the movable internal gear ring 14, but also radially limits the first drive structure 1233 and the movable internal gear ring 14, preventing radial wobble of the first drive structure 1233 and the movable internal gear ring 14, and improving the smoothness of the transmission between the first drive structure 1233 and the second drive structure 143.

[0057] Furthermore, one end of the first bearing 16 abuts against the second planetary support 123, and the other end abuts against the movable internal gear ring 14, thereby improving the smoothness of the rotation of the second planetary support 132 and enhancing the operational reliability of the motor assembly 1.

[0058] Furthermore, one end of the second bearing 17 abuts against the movable internal gear ring 14, and the other end abuts against the housing 15, so as to axially limit the movable internal gear ring 14, reduce the axial wobble of the movable internal gear ring 14, improve the rotational smoothness of the movable internal gear ring 14, and improve the transmission smoothness of the second drive structure 143.

[0059] As a preferred embodiment of the present invention, such as Figure 10 and Figure 11 As shown, the outer side wall of the movable internal gear ring 14 is provided with a flange 141, and the inner side wall of the lower housing 152 is provided with a sliding groove 1521 that mates with the flange 141. Furthermore, the movable internal gear ring 14 is radially limited to reduce the radial wobble of the movable internal gear ring 14, improve the rotational stability of the movable internal gear ring 14, and improve the transmission stability of the second drive structure 143.

[0060] It should be noted that lubricating oil may be provided in the slide groove 1521 to improve the smoothness of the rotation of the flange 141 in the slide groove 1521, thereby improving the stability of the transmission of the movable internal gear ring 14.

[0061] During long-term use of the motor assembly, wear will occur on the contact surface between the second planetary support 123 and the first bearing 16, resulting in a gap between them. This causes the first bearing 16 to come into contact with the second planetary support 123, and the second planetary support 123 to experience some axial wobble, which will interfere with the movable internal gear ring 14. This application provides a wear-resistant pad 18 in the gap between the second planetary support 123 and the movable internal gear ring 14 to reduce the rotational interference of the second planetary support 123 on the movable internal gear ring 14, thereby ensuring the operational reliability of the motor assembly 1 and extending its service life.

[0062] Preferably, the second planetary support 123 is provided with a support rib 142 on the side near the wear-resistant pad 18, so that when the second planetary support 123 contacts the wear-resistant pad 18, the support rib 142 contacts the wear-resistant pad 18, thereby reducing the sliding friction area and ensuring the transmission stability of the second planetary support 123.

[0063] The technical solutions protected by this invention are not limited to the above embodiments. It should be noted that any combination of the technical solutions of any embodiment with one or more other embodiments is within the protection scope of this invention. Although the invention has been described in detail above with general descriptions and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of this invention are within the scope of protection claimed by this invention.

Claims

1. A motor assembly for a food processing machine, comprising a motor shaft, a first drive structure connected to the motor shaft, and a second drive structure coaxially sleeved on the outer periphery of the first drive structure, wherein the second drive structure is connected to the motor shaft via a reduction mechanism, characterized in that, The reduction mechanism includes a housing, within which are a planetary support, multiple double gears, a sun gear, and a movable internal gear ring. The multiple double gears are mounted on the planetary support and evenly distributed within the housing. Each double gear includes a large gear and a small gear coaxially and integrally connected. The large gear meshes with the sun gear and a fixed internal gear ring on the housing, respectively, while the small gear meshes with the movable internal gear ring. A first drive structure is located at the output end of the planetary support, and a second drive structure is located at the output end of the movable internal gear ring. The outer sidewall of the first drive structure and the inner sidewall of the second drive structure form a wedge-shaped gap with a gradually decreasing cross-section from the inside to the outside.

2. The motor assembly for a food processing machine as described in claim 1, characterized in that, The difference in the number of teeth between the fixed internal gear ring and the movable internal gear ring is an integer multiple N of the number of double gears, where N≤3.

3. The motor assembly for a food processing machine as described in claim 2, characterized in that, The tip circle diameter of the pinion is not greater than the root circle diameter of the gear.

4. The motor assembly for a food processing machine as described in claim 1, characterized in that, The tooth width of the pinion is not less than the tooth width of the gear.

5. A motor assembly for a food processing machine as described in claim 1, characterized in that, A first bearing is provided between the first drive structure and the movable internal gear ring, and a second bearing is provided between the movable internal gear ring and the housing. One end of the first bearing abuts against the planetary support, and the other end abuts against the movable internal gear ring.

6. A motor assembly for a food processing machine as described in claim 5, characterized in that, One end of the second bearing abuts against the movable internal gear ring, and the other end abuts against the housing.

7. A motor assembly for a food processing machine as described in claim 6, characterized in that, The outer side wall of the movable internal gear ring is provided with a flange, and the inner side wall of the housing is provided with a sliding groove that mates with the flange.

8. A motor assembly for a food processing machine as described in claim 5, characterized in that, There is a gap between the planetary support and the movable internal gear ring, and a wear-resistant pad is provided in the gap.

9. A motor assembly for a food processing machine as described in claim 1, characterized in that, The housing includes a first housing and a second housing that are detachably connected. The inner sidewall of the first housing is provided with internal teeth along the circumferential direction to form a fixed internal tooth ring.

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