Output shaft assembly and motor using the same

Abstract

The present invention discloses an output shaft assembly and a motor using the same, comprising: an integrally injection-molded, coaxially distributed shaft output portion and a shaft support portion, and a neck portion and a gear portion disposed on the outer periphery of the shaft support portion; the neck portion and the gear portion are sequentially arranged along the shaft output portion toward the shaft support portion; and a connecting hole is coaxially disposed at least within the shaft support portion, connecting the end of the shaft support portion facing away from the shaft output portion. The present invention can effectively reduce the production and processing costs of the output shaft assembly and extend the service life of the entire motor.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to an output shaft assembly and a motor using the output shaft assembly. Background Art

[0002] Motors are widely used in household appliances. A typical motor consists of a housing assembly, rotor assembly, stator assembly, reduction gear, and output shaft assembly. The most commonly used output shaft assembly is composed of a machined metal output shaft and an injection-molded plastic gear, joined by riveting or insert injection molding.

[0003] Through actual production and use research, it was found that the output shaft assembly commonly used in the prior art has the following problems:

[0004] There are many processing steps and high labor costs. In addition, the numerous processes will lead to a series of quality risks, such as gear falling off, output shaft riveting deformation, wrong use of parts, etc., which increases the difficulty of managing motor production.

[0005] In addition, in the motors commonly used in the prior art, the small diameter end of the output shaft is inserted into the flange hole of the fixed plate of the motor, and the two are clearance-fitted, while the large diameter end of the output shaft passes through the inner hole of the bearing in the flange hole of the motor cover plate and is placed on the outside of the motor. Before assembly, the bearing needs to be assembled in the flange hole of the cover plate to form a cover plate assembly; during the operation of the motor, the torque is rotated and output through the reduction gear and the output shaft, and the small diameter end of the output shaft rubs against the inner hole of the flange hole of the fixed plate. Due to its small contact area, the output shaft has a certain radial pressure during rotation. When the contact surface of the output shaft and the inner hole of the fixed plate is small, the radial force exerted by the output shaft on the contact surface between the two is large, which makes the friction between the output shaft and the inner hole of the fixed plate large. At the same time, due to the process errors and burrs in the flange hole of the fixed plate, the friction between the output shaft and the inner hole wall of the fixed plate is further increased. When the motor shaft rotates for a long time, the output shaft may be severely worn locally or the inner hole diameter of a certain direction of the fixed plate may become larger due to long-term wear, causing the position of the output shaft relative to the fixed plate assembly to change, and the verticality of the output shaft assembly cannot be guaranteed, thereby greatly reducing the service life of the motor. Summary of the Invention

[0006] A first object of the present invention is to provide an output shaft assembly to solve the technical problem of effectively reducing the production cost of the output shaft assembly.

[0007] A second object of the present invention is to provide a motor to solve the technical problem of extending the service life of the motor.

[0008] The output shaft assembly of the present invention is achieved as follows:

[0009] An output shaft assembly comprises: a shaft output portion and a shaft support portion, which are integrally injection-molded and coaxially distributed, and a neck portion and a gear portion provided on the outer circumference of the shaft support portion;

[0010] The neck portion and the gear portion are arranged in sequence along the direction from the shaft output portion to the shaft support portion; and

[0011] A communication hole communicating with an end portion of the shaft support portion facing away from the shaft output portion is coaxially provided at least inside the shaft support portion.

[0012] In an optional embodiment of the present invention, a limiting portion coaxially distributed with the shaft supporting portion is further formed at one end of the shaft supporting portion away from the shaft output portion; and a countersunk hole coaxial with and penetrating the communicating hole is formed inside the limiting portion; and

[0013] The inner diameter of the countersunk hole is not smaller than the inner diameter of the communicating hole.

[0014] In an optional embodiment of the present invention, the limiting portion deviates from

[0015] The end of the shaft support portion protrudes from the end of the gear portion away from the shaft output portion.

[0016] In an optional embodiment of the present invention, the communicating hole extends within the shaft supporting portion to an area corresponding to the neck.

[0017] In an optional embodiment of the present invention, at least an exhaust hole extending to the communicating hole and penetrating the communicating hole is provided inside the shaft output portion;

[0018] One end of the exhaust hole away from the communicating hole extends to an end of the shaft output portion away from the shaft supporting portion.

[0019] In an optional embodiment of the present invention, the inner hole size of the end portion where the exhaust hole is connected to the communicating hole is smaller than the inner diameter of the communicating hole.

[0020] In an optional embodiment of the present invention, the exhaust hole includes a transition hole connected to the communicating hole and an exhaust hole connected to the transition hole; and

[0021] The inner hole size of the air outlet hole is larger than the inner hole size of the transition hole.

[0022] In an optional embodiment of the present invention, the outer diameter of the neck portion is larger than the outer diameter of the shaft output portion; and the outer diameter of the gear portion is larger than the outer diameter of the neck portion; and

[0023] One side end of the gear portion away from the shaft output portion is coplanar with one side end of the shaft support portion away from the shaft output portion.

[0024] In an optional embodiment of the present invention, the inner annular surfaces of the neck portion and the gear portion are directly formed on the outer peripheral side wall of the shaft support portion.

[0025] In an optional embodiment of the present invention, radial gaps exist between the inner annular surfaces of the neck portion and the gear portion and the outer peripheral side wall of the shaft support portion;

[0026] One end of the neck portion facing the shaft output portion is connected to the shaft support portion via a first annular connecting portion;

[0027] One end of the neck portion facing the gear portion is connected to the gear portion through a second annular connecting portion.

[0028] In an optional embodiment of the present invention, a plurality of reinforcing ribs are spaced and evenly distributed along the circumferential direction between the inner annular surfaces of the neck and gear portion and the outer peripheral side wall of the shaft support portion.

[0029] In an optional embodiment of the present invention, the inner annular surface of the neck portion is directly formed on the outer peripheral side wall of the shaft support portion; and

[0030] There is a radial gap between the inner annular surface of the gear portion and the outer peripheral side wall of the shaft support portion; and a plurality of reinforcing ribs are spaced and evenly distributed along the circumferential direction between the inner annular surface of the gear portion and the outer peripheral side wall of the shaft support portion.

[0031] The motor of the present invention is realized as follows:

[0032] A motor, comprising: the output shaft assembly, and a cover plate and a fixing plate assembly respectively connected to the output shaft assembly; wherein

[0033] The fixing plate of the fixing plate assembly is provided with a positioning shaft for inserting into the communicating hole; and

[0034] The cover plate is provided with a mounting hole for matching the neck.

[0035] By adopting the above technical solution, the present invention has the following beneficial effects: the output shaft assembly of the present invention and the motor using the output shaft assembly, including the shaft output part, the shaft support part and the neck and the gear part, are integrally injection-molded. Not only is the material cost low and the processing is convenient, but the coaxiality can also be effectively guaranteed, thereby effectively reducing the production and processing cost of the overall output shaft assembly.

[0036] Furthermore, by forming a connecting hole in the output shaft assembly, it is convenient to assemble and fix it with the positioning shaft of the fixed plate of the motor, thereby ensuring the verticality of the output shaft assembly and the positioning shaft during installation, ensuring the positioning between the fixed plate and the output shaft assembly, and preventing the position between the positioning column and the output shaft assembly from shifting due to long-term use, thereby extending the service life of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1Schematic diagram of the three-dimensional structure of the output shaft assembly of Example 1 of the present invention in one implementation;

[0038] Figure 2 Schematic diagram of the cross-sectional structure of the output shaft assembly of embodiment 1 of the present invention in one implementation;

[0039] Figure 3 Schematic diagram of the cross-sectional structure of the output shaft assembly of embodiment 1 of the present invention in another implementation;

[0040] Figure 4 Schematic diagram of the cross-sectional structure of the output shaft assembly of embodiment 2 of the present invention;

[0041] Figure 5 Schematic diagram of the cross-sectional structure of the output shaft assembly of embodiment 3 of the present invention;

[0042] Figure 6 for Figure 3 、 Figure 4 and Figure 5 Schematic diagram of the K-part amplified structure;

[0043] Figure 7 Schematic diagram of the three-dimensional structure of the output shaft assembly of embodiment 3 of the present invention;

[0044] Figure 8 This is a schematic diagram of the exploded structure formed by the output shaft assembly, the fixing plate assembly, and the cover plate in the motor of Example 4 of the present invention;

[0045] Figure 9 Schematic diagram of the matching structure formed by the output shaft assembly, the fixing plate assembly and the cover plate in the motor of Example 4 of the present invention;

[0046] Figure 10 This is a schematic diagram of the first process in the process of forming the cover plate in the motor according to the fourth embodiment of the present invention;

[0047] Figure 11 This is a schematic diagram of the second process in the cover plate forming process of the motor according to embodiment 4 of the present invention.

[0048] In the figure: connecting hole 1, fixing plate assembly 7, positioning shaft 72, reduction gear 8, output shaft assembly 9, cover plate 10, flanging hole 101, shaft output part 911, shaft support part 912, limiting part 913, flat surface 914, neck 92, gear part 93, countersunk hole 94, first connecting part 95, second connecting part 96, reinforcing rib 97, transition hole 99, air outlet 98. DETAILED DESCRIPTION

[0049] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments in conjunction with the accompanying drawings.

[0050] Example 1:

[0051] See also Figures 1 to 3 As shown, this embodiment provides an output shaft assembly comprising: an integrally injection-molded and coaxially distributed shaft output portion 911 and a shaft support portion 912; and a neck portion 92 and a gear portion 93 disposed on the outer periphery of the shaft support portion 912. The neck portion 92 and the gear portion 93 are sequentially arranged along the shaft output portion 911 toward the shaft support portion 912. Furthermore, a connecting hole 1 is coaxially disposed within at least the shaft support portion 912, connecting the end of the shaft support portion 912 facing away from the shaft output portion 911. The outer diameter of the neck portion 92 is greater than that of the shaft output portion 911, and the outer diameter of the gear portion 93 is greater than that of the neck portion 92.

[0052] In an optional implementation, in order to meet the requirements of the shaft output portion 911 for coordination with other structures, symmetrically distributed flat surfaces 914 are formed on the outer side wall of the shaft output portion 911 in this embodiment.

[0053] On the basis of the above structure, the following structural improvements can be made: a limiting portion 913 coaxially distributed with the shaft support portion 912 is formed at the end of the shaft support portion 912 away from the shaft output portion 911; and a countersunk hole 94 coaxial with and through the connecting hole 1 is formed inside the limiting portion 913. It should be noted that the limiting portion 913 is preferably injection molded integrally with the shaft support portion 912, which has stable dimensional consistency and can greatly ensure the consistency of the axial movement of the output shaft assembly 9 when used in a specific motor. The inner diameter of the countersunk hole 94 is not less than the inner diameter of the connecting hole 1. Preferably, the inner diameter of the countersunk hole 94 is the same as the inner diameter of the connecting hole 1, and the countersunk hole 94 and the connecting hole 1 are integrally formed during the processing process.

[0054] Regarding the aforementioned limiting portion 913, it is necessary to further explain that, first, the end of the limiting portion 913 facing away from the shaft support portion protrudes from the end of the gear portion 93 facing away from the shaft output portion 911, thereby limiting the axial movement of the output shaft assembly 9 within the motor. In one optional embodiment, the end of the gear portion 93 facing away from the shaft output portion 911 is coplanar with the end of the shaft support portion 912 facing away from the shaft output portion 911.

[0055] Furthermore, for example, the limiting portion 913 adopts a cylindrical structure. The outer diameter of the limiting portion 913 can be the same as the outer diameter of the shaft output portion 911, or the outer diameter of the limiting portion 913 can be smaller than the outer diameter of the shaft support portion 912. From the perspective of saving raw materials, the outer diameter of the limiting portion 913 is smaller than the outer diameter of the shaft support portion 912.

[0056] Regarding the extension depth of the connecting hole 1 within the shaft support portion 912, in one feasible solution, the connecting hole 1 extends from the shaft support portion 912 to the interior of the shaft output portion 911. The specific extension depth is not absolutely limited in this embodiment. In another feasible solution, the connecting hole 1 is only located within the interior of the shaft support portion 912. Both of the above scenarios meet the requirements of this embodiment and are not absolutely limited in this embodiment.

[0057] In addition, this embodiment also has the following structural design: at least an exhaust hole extending to the connecting hole 1 and passing through the connecting hole 1 is provided inside the shaft output part 911; the exhaust hole extends from one end of the connecting hole 1 to the end of the shaft output part 911 away from the shaft support part 912.

[0058] Regarding the above structure, it should be noted that the inner hole size of the end portion of the exhaust hole connecting to the connecting hole 1 is smaller than the inner diameter of the connecting hole 1. The cross-sectional shape of the exhaust hole can be circular, rectangular, or other shapes. For ease of processing and forming, the exhaust hole adopts a hole structure with a circular cross-sectional shape. In this case, the inner hole diameter of the end portion of the exhaust hole connecting to the connecting hole 1 is smaller than the diameter of the connecting hole 1, thereby forming a step structure at the junction of the exhaust hole and the connecting hole 1.

[0059] In a preferred embodiment, the exhaust hole includes a transition hole 99 connected to the connecting hole 1 and an air outlet hole 98 connected to the transition hole 99 ; and the inner hole size of the air outlet hole 98 is larger than the inner hole size of the transition hole 99 .

[0060] Next, we will explain the specific structure of the neck portion 92 and gear portion 93. In this embodiment, the inner annular surfaces of the neck portion 92 and gear portion 93 are directly molded onto the outer peripheral sidewall of the shaft support portion 912. In other words, the entire neck portion 92 and gear portion 93 are a solid structure that is directly injection molded onto the outer peripheral sidewall of the shaft support portion 912. While this structure of the neck portion 92 and gear portion 93 effectively ensures the overall strength of the output shaft assembly 9, it also requires a relatively large amount of raw materials, thereby increasing material costs. Furthermore, this structure can result in undesirable phenomena such as air holes and shrinkage deformation within the output shaft assembly 9 after injection molding.

[0061] Example 2:

[0062] See also Figure 4 and Figure 6 As shown, based on the output shaft assembly of Example 1, the output shaft assembly provided in this embodiment has roughly the same structure as the output shaft assembly of Example 1, except that the structure of the neck 92 and the gear part 93 in this embodiment is different from that of Example 1.

[0063] Specifically, the inner annular surface of the neck portion 92 in this embodiment is directly molded onto the outer circumferential sidewall of the shaft support portion 912; that is, the entire neck portion 92 is a solid structure directly injection-molded onto the outer circumferential sidewall of the shaft support portion 912. A radial gap exists between the inner annular surface of the gear portion 93 and the outer circumferential sidewall of the shaft support portion 912; and a plurality of reinforcing ribs 97 are spaced and evenly distributed circumferentially between the inner annular surface of the gear portion 93 and the outer circumferential sidewall of the shaft support portion 912.

[0064] The output shaft assembly 9 under this structure requires lower material costs than the output shaft assembly 9 of Example 1, and the overall strength of the output shaft assembly 9 can be ensured by the design of the reinforcing ribs 97.

[0065] Example 3:

[0066] See also Figure 5 and Figure 6 As shown, based on the output shaft assembly of Example 1 or Example 2, the output shaft assembly provided in this embodiment has roughly the same structure as the output shaft assembly of Example 1 or Example 2, the difference being that the structure of the neck portion 92 and the gear portion 93 in this embodiment is different from that of Example 1 or Example 2.

[0067] Specifically, in this embodiment, radial gaps exist between the inner annular surfaces of the neck portion 92 and the gear portion 93 and the outer peripheral side wall of the shaft support portion 912 .

[0068] In detail, referring to the accompanying drawings, the end of the neck 92 in this embodiment facing the shaft output portion 911 is connected to the shaft support portion 912 through a first annular connecting portion 95; the end of the neck 92 facing the gear portion 93 is connected to the gear portion 93 through a second annular connecting portion 96.

[0069] To enhance the overall strength of the output shaft assembly 9, this embodiment features multiple reinforcing ribs 97 spaced and evenly distributed along the circumference between the inner annular surfaces of the neck portion 92 and gear portion 93 and the outer circumferential sidewall of the shaft support portion 912. These ribs 97 are of uniform size and thickness. This structure allows the first connecting portion 95, the second connecting portion 96, and the multiple reinforcing ribs 97 to integrally connect the neck portion 92, the gear, and the shaft support portion 912, thereby enhancing the connection strength between these three components.

[0070] During the injection molding process of the composite shaft structure, the molten resin flows along the shape of the reinforcing ribs 97 in the output shaft assembly 9 of this embodiment. This allows the molten resin to flow smoothly within the injection mold, allowing the molten resin to fill the entire cavity of the injection mold, thereby reducing the possibility of molding defects. After injection molding, the multiple reinforcing ribs 97, which are evenly spaced and distributed along the circumference of the shaft support portion 912, have equal shrinkage rates and uniform internal stress distribution around the circumference of the shaft support portion 912. This ensures a high degree of coaxiality between the shaft support portion 912, the neck portion 92, and the gear portion 93.

[0071] Example 4:

[0072] See also Figure 7 and Figure 11 As shown, based on the output shaft assembly of Example 1 or Example 2 or Example 3, this embodiment provides a motor, including: the output shaft assembly 9 of Example 1 or Example 2 or Example 3 and the cover plate 10 and the fixed plate assembly 7 respectively matched with the output shaft assembly 9; wherein the fixed plate in the fixed plate assembly 7 is provided with a positioning shaft 72 for inserting into the connecting hole 1; and the cover plate 10 is provided with a mounting hole for matching the neck 92.

[0073] First of all, when the cover 10 is assembled and placed on the motor housing, the prefabricated flange hole 101 on the cover 10 can be accurately positioned at the neck 92 of the output shaft assembly 9, so that the flange hole 101 of the cover 10 can be easily fitted onto the neck 92 of the output shaft assembly 9, which can fully meet the requirements of automated assembly of the process of assembling the cover 10 in the motor housing.

[0074] The outer circumference of the neck portion 92 of the output shaft assembly 9 is loosely fitted with the inner circumference of the flanged hole 101 of the cover plate 10. Lubricant may be applied to the gap. The clearance between the outer diameter of the neck portion 92 and the diameter of the flanged hole 101 of the cover plate 10 is approximately 0.02 to 0.05 mm.

[0075] To facilitate installation of the cover plate 10 and the neck portion 92 of the output shaft assembly 9, the flanged hole 101 of the cover plate 10 in this embodiment is provided with angles r2 and r3 at both axial ends. The flanged hole 101 of the cover plate 10 is formed in two steps: a first step, namely, pre-hole punching, and a second step, namely, hole punching. The punch punching direction in the first step is the same as the punch punching direction in the second step, resulting in angles r2 and r3 at both ends of the flanged hole 101 of the cover plate 10.

[0076] More specifically, the cover plate 10 in this embodiment is formed by stamping a metal plate 106 using a stamping die:

[0077] The first process (prefabricated hole punching process) is realized by a punching die; the punching die is composed of a punch 102 placed on the A side of the metal plate 106 and a die 103 placed on the B side of the metal plate 106, the A side is the opposite side of the surface where the flanging hole 101 is located in the cover plate 1010, and the B side is the surface where the flanging hole 101 is located in the cover plate 1010; the punch 102 is moved from the A side of the metal plate 106 to the B side of the metal plate 106, and a prefabricated hole 107 is punched out on the metal plate 106, forming a collapsed angle r2 on the A side of the metal plate 106, and forming a burr 108 on the B side of the metal plate.

[0078] The second process (flanging process) is realized by a flanging die; the flanging die is composed of a punch 104 placed on the A side of the metal plate 106 and a die 105 placed on the B side of the metal plate 106. The punch 104 is extruded from the A side of the metal plate 106 to the B side of the metal plate 106, along the center line direction of the prefabricated hole 107 in the first process, to form a flanging hole 101; a collapsed angle r3 is formed on the A side of the metal plate 106, and the collapsed angle r2 is placed on the inner circumference of the flanging hole 101.

[0079] In the second process, the gap between the punch 105 and the die 105 is reduced, so that the inner circumference of the flanging hole 101 can be formed with better smoothness; in addition, the two ends of the inner circumference of the flanging hole 101 are respectively collapsed angles r2 and r3, which can reduce the friction between the inner circumference of the flanging hole 101 and the outer circumference of the neck 92 of the output shaft assembly 9; and the gap between the inner circumference of the flanging hole 101 and the outer circumference of the neck 92 of the output shaft assembly 9 is set to 0.02~0.05mm, and lubricating grease is applied in the gap, so that the purpose of extending the service life can be achieved.

[0080] Compared with the prior art structure in which a bearing is installed inside the flange hole 101 of the cover plate 10, and the bearing and the output shaft assembly 9 cooperate and rub against each other, the cooperation structure between the cover plate 10 and the output shaft assembly 9 of this embodiment directly eliminates the bearing, that is, the use of one bearing is reduced, which not only reduces the cost of parts, but also simultaneously reduces the cost of manual production.

[0081] Furthermore, in this embodiment, the positioning shaft 72 and the communicating hole 1 are clearance-fitted, with the clearance being 0.01 to 0.04 mm, so that the output shaft assembly 9 and the positioning shaft 72 of the fixing plate assembly 7 can rotate relative to each other.

[0082] Since the positioning shaft 72 is inserted into the connecting hole 1 after passing through the countersunk hole 94, in order to facilitate the assembly of the countersunk hole 94 and the positioning shaft 72, the countersunk hole 94 used in this embodiment is provided with a rounded corner r, the optimal value of which is 0.1 mm.

[0083] Combined with the structure of transition hole 99 and air outlet hole 98 in output shaft assembly 9, when output shaft assembly 9 is fitted onto positioning shaft 72 along counterbore 94 and the connecting hole, air within counterbore 94 and the connecting hole can be discharged through transition hole 99 and air outlet hole 98. This prevents air within counterbore 94 and the connecting hole from accumulating due to being unable to escape through the gap between the inner circumference of counterbore 94 and the outer circumference of positioning shaft 72, thereby preventing the output assembly from mating properly with positioning shaft 72 of fixed plate assembly 7 and causing the output shaft assembly 9 to float. Furthermore, this prevents the cover plate 10 from being completely assembled onto the motor housing due to being obstructed by the suspended output shaft assembly 9, thereby preventing the subsequent sealing process from being carried out.

[0084] Combined with the step structure formed at the junction of the exhaust hole and the connecting hole 1, the positioning shaft 72 of the fixed plate assembly 7 can be supported, reducing the probability of the positioning shaft 72 of the fixed plate assembly 7 falling off from the fixed plate of the fixed plate assembly 7. At the same time, the aperture of the transition hole 99 is smaller than the aperture of the connecting hole, which plays a positioning role for the positioning shaft 72; fillets will be formed on the two end faces of the positioning shaft 72 of the fixed plate assembly 7, and the radius of the fillets is generally 0.1 to 0.15 mm; therefore, the aperture of the transition hole 99 is at least about 0.4 mm smaller than the shaft diameter of the positioning shaft 72.

[0085] The larger diameter of the vent hole 98 than the transition hole 99 allows the structure of the connecting hole 1, transition hole 99, and vent hole 98 to be molded using a two-section mold core. Both sections of the mold core have a relatively short length, significantly increasing the mold core's service life. Furthermore, while ensuring the structural strength and injection molded wall thickness of the output shaft portion 911 of the output shaft assembly 9, the larger the diameter of the vent hole 98, the better. A larger diameter of the vent hole 98 allows the output shaft portion 911 of the output shaft assembly 9 to have a thinner wall thickness, thereby reducing the amount of injection molding material used and reducing the generation of bubbles within the structure of the output shaft assembly 9 during the cooling process of the injection molding process.

[0086] In addition, it should be noted that when a limiting portion 913 is designed on the output shaft assembly 9, the setting of the limiting portion 913 can increase the axial contact area between the countersunk hole 94 and the positioning shaft 72, which can not only reduce the wear between the countersunk hole 94 and the positioning shaft 72, but also ensure the positioning accuracy of the output shaft assembly 9 and the positioning shaft 72.

[0087] The limiting portion 913 of the output shaft assembly 9 can also leave space between the gear portion 93 of the output shaft assembly 9 and the fixed plate of the fixed plate assembly 7 for the wheel of the reduction gear 8 that is engaged with the gear portion 93 of the output shaft assembly 9 to rotate, thereby preventing interference between the gear portion 93 of the output shaft assembly 9 and the wheel of the reduction gear 8.

[0088] In addition, the design of the limiting portion 913 increases the total depth of the countersunk hole 94 and the connecting hole 1, so that the total depth of the countersunk hole 94 and the connecting hole 1 of the output shaft assembly 9 can be equal to the riveting height of the positioning shaft 72 of the fixed plate assembly 7, thereby increasing the fitting length between the countersunk hole 94 and the connecting hole 1 of the output shaft assembly 9 and the positioning shaft 72, reducing their wear and extending the service life of the motor.

[0089] In a preferred embodiment, the connecting hole 1 extends within the shaft support portion 912 to the area corresponding to the neck 92. The significance of this design is:

[0090] During motor operation, the final gear of the gear train meshes with the gear portion 93 of the output shaft assembly 9. The positioning shaft 72 of the fixed plate assembly 7 is subjected to radial thrust and circumferential torque generated by the gear meshing. Because the inner surfaces of the counterbore 94 and the connecting hole 1, as well as the outer circumferential surface of the positioning shaft 72, are well-finished and grease is applied therebetween, the circumferential torque generated by friction on the positioning shaft 72 is small and nearly negligible. The depth of the connecting hole 1 is extended to the area corresponding to the neck 92 of the shaft support portion 912. That is, in the motor, the end of the connecting hole 1 of the output shaft assembly 9, away from the counterbore 94, is at the height of the flanged hole 101 of the cover plate 10. Because the riveted length of the positioning shaft 72 is equal to the combined depth of the counterbore 94 and the connecting hole 1, the upper end of the positioning shaft 72 of the fixed plate assembly 7 is positioned between the flanged hole 101 of the cover plate 10 in the motor. After receiving the radial thrust generated by the gear meshing, the positioning shaft 72 of the fixed plate assembly 7 evenly distributes the radial thrust to both ends of the positioning shaft 72. The axial hole on the fixed plate for fixing the positioning shaft 72 and the flange hole 101 of the cover plate 10 respectively apply a counter-support force to both ends of the positioning shaft 72 in the radial direction, thereby reducing the possibility of the positioning shaft 72 falling off due to the unbalanced force at its two ends. In other words, the structure of this embodiment can maintain the balanced force on the positioning shaft 72, reduce the probability of the positioning shaft 72 of the fixed plate assembly 7 falling off or deforming due to the unbalanced force at both ends, and thus effectively ensure the normal operation of the motor.

[0091] It should also be noted that the fixing plate assembly 7 in this embodiment can be manufactured using any well-established method in the prior art, and this embodiment is not strictly limited to this. This embodiment merely incorporates a positioning shaft 72 on the fixing plate of the fixing plate assembly 7 used in the prior art. For structural strength considerations, this positioning shaft 72 is made of metal and undergoes cutting, heat treatment, and polishing processes during the production process. This results in high dimensional accuracy, material strength, and surface finish, as well as simple processing and low cost.

[0092] The positioning shaft 72 and the fixed plate in this embodiment can be riveted and fixed by riveting dies. The positioning shaft 72 has good verticality relative to the fixed plate, and the riveting height of the positioning shaft 72 and the fixed plate is equal to the total depth of the countersunk hole 94 of the output shaft and the connecting hole 1.

[0093] The following structure can also be designed for the cooperation between the connecting hole 1, the counterbore 94 and the positioning shaft 72:

[0094] The outer surface of the positioning shaft 72 is coated with grease and then inserted into the countersunk hole 94 and the connecting hole 1. Under this structure, there is a smaller friction coefficient and smaller friction force between the positioning shaft 72 and the countersunk hole 94 and the connecting hole 1, thereby greatly improving the service life of the entire motor.

[0095] The above specific embodiments further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0096] In the description of the present invention, it should be understood that the terms indicating orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are only used to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they cannot be understood as limiting the present invention.

[0097] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0098] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like indicate positions or locations based on the positions shown in the accompanying drawings, or the positions or locations in which the inventive product is typically placed when in use. These terms are intended solely to facilitate the description of the present invention and to simplify the description, and are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0099] Furthermore, terms such as "horizontal," "vertical," and "overhanging" do not necessarily imply that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0100] In the present invention, unless otherwise expressly specified or limited, a first feature being above or below a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being above, above, and above the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being below, below, and below the second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

Claims

1. An output shaft assembly, characterized in that: include: An integrally injection-molded and coaxially distributed shaft output portion, a shaft support portion, and a neck portion and a gear portion provided on the outer circumference of the shaft support portion; The neck portion and the gear portion are arranged in sequence along the direction from the shaft output portion to the shaft support portion; A communication hole is coaxially provided at least inside the shaft support portion, communicating with the end portion of the shaft support portion facing away from the shaft output portion; At least one exhaust hole is provided inside the shaft output portion, extending to the communicating hole and penetrating the communicating hole; one end of the exhaust hole away from the communicating hole extends to the end of the shaft output portion away from the shaft support portion; the inner hole size of the end of the exhaust hole connected to the communicating hole is smaller than the inner diameter of the communicating hole; the exhaust hole includes a transition hole connecting the communicating hole and an exhaust hole penetrating and connected to the transition hole; the inner hole size of the exhaust hole is larger than the inner hole size of the transition hole; The inner annular surfaces of the neck portion and the gear portion are directly formed on the outer peripheral side wall of the shaft support portion; There is a radial gap between the inner annular surface of the neck and the gear portion and the outer peripheral side wall of the shaft support portion; the end of the neck facing the shaft output portion is connected to the shaft support portion through a first annular connecting portion; the end of the neck facing the gear portion is connected to the gear portion through a second annular connecting portion; A plurality of reinforcing ribs are spaced and evenly distributed along the circumferential direction between the inner annular surfaces of the neck portion and the gear portion and the outer peripheral side wall of the shaft support portion.

2. The output shaft assembly according to claim 1, characterized in that A limiting portion coaxially distributed with the shaft supporting portion is formed at one end of the shaft supporting portion away from the shaft output portion; and a countersunk hole coaxial with and penetrating the communicating hole is formed inside the limiting portion; and The inner diameter of the countersunk hole is not smaller than the inner diameter of the communicating hole.

3. The output shaft assembly according to claim 2, characterized in that: The end of the limiting portion away from the shaft supporting portion protrudes from the end of the gear portion away from the shaft output portion.

4. The output shaft assembly according to any one of claims 1 to 3, characterized in that: The communicating hole extends in the shaft supporting portion to a region corresponding to the neck portion.

5. The output shaft assembly according to any one of claims 1 to 3, characterized in that: The outer diameter of the neck portion is larger than the outer diameter of the shaft output portion; and the outer diameter of the gear portion is larger than the outer diameter of the neck portion; and One side end of the gear portion away from the shaft output portion is coplanar with one side end of the shaft support portion away from the shaft output portion.

6. The output shaft assembly according to any one of claims 1 to 3, characterized in that: The inner annular surface of the neck portion is directly formed on the outer peripheral side wall of the shaft support portion; and There is a radial gap between the inner annular surface of the gear portion and the outer peripheral side wall of the shaft support portion; and a plurality of reinforcing ribs are spaced and evenly distributed along the circumferential direction between the inner annular surface of the gear portion and the outer peripheral side wall of the shaft support portion.

7. A motor, characterized in that: The output shaft assembly comprises the output shaft assembly according to any one of claims 1 to 6, and a cover plate and a fixing plate assembly respectively matched with the output shaft assembly; in The fixing plate of the fixing plate assembly is provided with a positioning shaft for inserting into the communicating hole; and The cover plate is provided with a mounting hole for matching the neck.

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