Combined structure of single-phase series motor and gearbox

Abstract

The utility model discloses a combined structure of a single-phase series-excited motor and a gearbox. The combined structure comprises the single-phase series-excited motor; one end of the gear box is connected with the single-phase series motor; the gear box comprises a shell and a gear box body, wherein the shell is provided with first space; the shell cover and the shell are arranged in a split mode, a second space is formed in the shell cover, and after the shell cover is connected to the shell, the first space and the second space are combined into an inner space; one end of the shell is provided with a convex edge, four first through holes are formed in the convex edge, screws penetrate through the first through holes in a one-to-one mode to be connected with the single-phase series motor, and an output shaft on the single-phase series motor penetrates out of the convex edge to enter the inner space; the convex edge protrudes out of the first space, and after the shell cover is connected to the shell, the top of the convex edge is higher than the top of the shell cover; therefore, the technical problems that when the output shaft of the motor is meshed with the gear in the gear box, the output shaft of the motor collides with the gear in the gear box, meshing positions are inconsistent, assembling is inconvenient, and assembling precision is difficult to unify are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of household food stirring appliances, in particular to a combined structure of a single-phase series-excited motor and a gear box. Background Art

[0002] With the development of intelligent home appliances, blenders have been widely favored due to their convenience and have become one of the common tools in the kitchen.

[0003] The combination of the motor and the gearbox is an important part of the mixer, which is used to generate a rotational driving force, thereby linking the mixing paddle to rotate and achieve mixing of food.

[0004] In the traditional combination structure of a motor and a gearbox, the gearbox and the motor are usually assembled separately. After the gearbox is assembled, it is assembled with the motor. In this assembly method, since the internal structure of the gearbox cannot be seen, the output shaft of the motor will collide with the gear in the gearbox when meshing. The meshing positions are inconsistent, abnormal noises will occur, assembly is inconvenient, and it is difficult to unify the assembly accuracy. Utility Model Content

[0005] In view of the above-mentioned deficiencies existing in the related art, the purpose is to provide a combination structure of a single-phase series-excited motor and a gearbox to solve the technical problems that when the output shaft of the motor in the related art meshes with the gear in the gearbox, the two collide, the meshing position is inconsistent, the assembly is inconvenient, and the assembly accuracy is difficult to unify.

[0006] The technical solution to achieve the purpose is: a combined structure of a single-phase series-excited motor and a gear box, comprising: a single-phase series-excited motor; and a gear box, one end of which is connected to the single-phase series-excited motor;

[0007] The gearbox comprises: a housing, the housing having a first space; and a housing cover, which is separately provided from the housing, the housing cover having a second space, and after the housing cover is connected to the housing, the first space and the second space are combined into an inner space;

[0008] One end of the housing has a convex edge, and the convex edge has four first through holes, through which screws are inserted one by one to connect the single-phase series-excited motor, and the output shaft of the single-phase series-excited motor passes through the convex edge and enters the inner space;

[0009] The convex edge protrudes out of the first space, and after the shell cover is connected to the shell, the top of the convex edge is higher than the top of the shell cover.

[0010] Further: the gear box further comprises: a first gear set connected to a first hole on the housing, meshing with the output shaft in the inner space, and one end of the first gear set is plugged into the housing cover;

[0011] A second gear set is connected to a second hole on the housing, meshed with the first gear set in the inner space, and one end of the second gear set is plugged into the housing cover, and the other end passes through the second hole and protrudes outside the housing;

[0012] and a third gear set connected between the housing and the housing cover, in the inner space, meshing with the second gear set.

[0013] Further: the gear box also includes: a blind cover, connected to the first hole, spaced apart from the other end of the first gear set, blocking the first gear set.

[0014] Further: the first gear set includes: a first sleeve connected to the first hole; a first gear passed through the first sleeve, with the top passing through the first sleeve and plugged into the shell cover, and the bottom set in the first hole and blocked by the cover; a first gasket, sleeved on the first gear and in contact with the first sleeve; a second gear, sleeved on the first gear and in contact with the first gasket, for engaging with the output shaft; a first pin connecting the first gear and the second gear; and a second gasket, sleeved on the first gear and in contact with the second gear and the shell cover.

[0015] Further: the first gear includes: a first shaft, which passes through the first sleeve, connects the first gasket, the second gear, the first pin shaft and the second gasket, and is plugged into the shell cover; and a plurality of first protruding teeth, which are connected to the first shaft.

[0016] Further: the second gear set includes: a second sleeve connected to the second hole; a second shaft passed through the second sleeve, one end of which is plugged into the shell cover, and the other end passes through the second hole and protrudes from the outside of the shell; a third gasket sleeved on the second shaft and in contact with the second sleeve; a third gear sleeved on the second shaft, in contact with the third gasket, and meshed with the first convex tooth and the third gear set; and a second pin shaft inserted into the second shaft and connected to the third gear.

[0017] Further: the third gear comprises: a wheel body, the wheel body is a stepped structure, sleeved on the second shaft, and positioned by the second pin shaft;

[0018] A plurality of second convex teeth, evenly distributed on the large outer circle of the wheel body, for meshing with the first convex teeth;

[0019] And a plurality of third convex teeth are evenly distributed on the small outer circle of the wheel body, arranged at intervals from the second convex teeth, and are used to mesh with the third gear set.

[0020] Further: the middle position of the wheel body has a second through hole and two grooves;

[0021] The second through hole is used for plugging with the second shaft;

[0022] The grooves are symmetrically arranged on both sides of the second through hole, the grooves are connected to the second through hole, and the height of the grooves is smaller than the height of the second through hole;

[0023] The groove is used to accommodate the second pin.

[0024] Furthermore: the shell also has an escape space, which is connected to the first hole and accommodates a part of the wheel body and a part of the second protruding teeth.

[0025] Further: the third gear set includes: a gear body, connected to the positioning cavity formed between the shell and the shell cover, and one end of the gear body is arranged in the inner space; and a plurality of fourth convex teeth, evenly distributed on one end of the gear body, meshing with the third convex teeth.

[0026] The above technical solution has the following beneficial effects: the combined structure of the single-phase series-excited motor and the gear box is provided with a single-phase series-excited motor and a gear box compared with the related art;

[0027] The gearbox comprises: a housing, the housing having a first space; and a housing cover, which is separately provided from the housing, the housing cover having a second space, and after the housing cover is connected to the housing, the first space and the second space are combined into an inner space;

[0028] A convex edge is provided on one end of the shell, and four first through holes are provided on the convex edge. Screws are inserted one by one through the first through holes to connect the single-phase series-excited motor, and the convex edge protrudes out of the first space. After the shell cover is connected to the shell, the top of the convex edge is higher than the top of the shell cover, and the contact area between the convex edge and the single-phase series-excited motor is relatively large, so that the single-phase series-excited motor is connected by inserting screws through the convex edge. After the single-phase series-excited motor is connected to the convex edge, the output shaft on the single-phase series-excited motor passes through the convex edge and enters the inner space, so that the position of the single-phase series-excited motor is fixed, and the position of the output shaft in the inner space is also fixed. Moreover, the shell body and the shell cover are separately arranged. When assembling other parts of the gear box, the shell cover is removed, the position of the output shaft can be clearly seen, there will be no collision, the meshing position is relatively consistent, the assembly is relatively convenient, and the assembly accuracy is relatively uniform; thereby overcoming the technical problems that when the output shaft of the motor meshes with the gear in the gear box, the two collide, the meshing position is inconsistent, the assembly is inconvenient, and the assembly accuracy is difficult to unify, and the technical effect of no collision, relatively consistent meshing position, relatively convenient assembly, and relatively uniform assembly accuracy is achieved, which is practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a partial cross-sectional view of the general assembly;

[0030] Figure 2 It is a structural schematic diagram of a single-phase series-excited motor and a housing connected by screws;

[0031] Figure 3 This is a schematic diagram of the general assembly structure;

[0032] Figure 4 for Figure 3 Schematic diagram of the structure after removing the shell cover;

[0033] Figure 5 for Figure 1 or Figure 3 Exploded diagram of

[0034] Figure 6 for Figure 3 Schematic diagram of the structure after removing the housing cover and the third gear set;

[0035] Figure 7 is a partial cross-sectional view of the first gear set;

[0036] Figure 8 is a partial cross-sectional view of the second gear set;

[0037] In the figure: 10. single-phase series motor, 20. gear box, 21. housing, 21-1. convex edge, 21-2. first hole, 21-3. second hole, 21-4. avoidance space, 21-5. positioning cavity, 21-11. first through hole, 22. housing cover, 23. first gear set, 23-1. first bushing, 23-2. first gear, 23-21. first shaft, 23-22. first convex tooth, 23-3. first gasket, 23-4. second gear, 23-5. first Pin, 23-6. Second gasket, 24. Second gear set, 24-1. Second bushing, 24-2. Second shaft, 24-3. Third gasket, 24-4. Third gear, 24-41. Wheel body, 24-41-1. Second through hole, 24-41-2. Groove, 24-42. Second convex tooth, 24-43. Third convex tooth, 24-5. Second pin, 25. Third gear set, 25-1. Gear body, 25-2. Fourth convex tooth, 26. Cover, 30. Screw. DETAILED DESCRIPTION

[0038] In order to make the content easier to understand, the following is a further detailed description based on specific embodiments and in conjunction with the accompanying drawings;

[0039] The combined structure of the single-phase series-excited motor and the gearbox solves the technical problems in the related art that when the output shaft of the motor meshes with the gear in the gearbox, the two collide, the meshing position is inconsistent, the assembly is inconvenient, and the assembly precision is difficult to unify. It can be manufactured and used, and achieves the positive effects of no collision, relatively consistent meshing position, relatively convenient assembly, and relatively uniform assembly precision. The overall idea is as follows:

[0040] One implementation method:

[0041] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 As shown; the combined structure of a single-phase series-excited motor and a gear box comprises: a single-phase series-excited motor 10; and a gear box 20, one end of which is connected to the single-phase series-excited motor 10;

[0042] The gearbox 20 comprises: a housing 21, the housing 21 having a first space; and a housing cover 22, which is disposed separately from the housing 21 and has a second space. After the housing cover 22 is connected to the housing 21, the first space and the second space are combined into an inner space.

[0043] The housing 21 has a convex edge 21-1 at one end, and the convex edge 21-1 has four first through holes 21-11, through which screws 30 are inserted one by one to connect the single-phase series-excited motor 10, and the output shaft 11 on the single-phase series-excited motor 10 passes through the convex edge 21-1 and enters the inner space;

[0044] The convex edge 21 - 1 protrudes out of the first space, and after the shell cover 22 is connected to the housing 21 , the top of the convex edge 21 - 1 is higher than the top of the shell cover 22;

[0045] Specifically, during implementation, the contact area between the convex edge 21-1 and the single-phase series-excited motor 10 is relatively large, and the single-phase series-excited motor 10 is connected by inserting the screw 30 through the convex edge 21-1. After the single-phase series-excited motor 10 is connected to the convex edge 21-1, the output shaft 11 on the single-phase series-excited motor 10 passes through the convex edge 21-1 and enters the inner space. The position of the single-phase series-excited motor 10 is fixed, and the position of the output shaft 11 in the inner space is also fixed. Moreover, the housing 21 and the housing cover 22 are separately arranged. When assembling other components of the gear box 20, the housing cover 22 is removed, and the position of the output shaft 11 can be clearly seen, and there will be no collision. The meshing position is relatively consistent, the assembly is relatively convenient, and the assembly accuracy is relatively uniform.

[0046] Another embodiment:

[0047] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 As shown; during implementation, the single-phase series-excited motor 10 is a common structure in the prior art, and is connected to the convex edge 21-1 by a screw 30, so that the position of the single-phase series-excited motor 10 is fixed, the position of the output shaft 11 in the inner space is also fixed, and the contact area between the convex edge 21-1 and the single-phase series-excited motor 10 is relatively large, and the reliability of the connection is good;

[0048] Another embodiment:

[0049] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 As shown; when implemented, the gear box 20 further includes: a first gear set 23, connected to the first hole 21-2 on the housing 21, meshing with the output shaft 11 in the inner space, and one end of the first gear set 23 is plugged into the housing cover 22;

[0050] The second gear set 24 is connected to the second hole 21-3 on the housing 21, meshing with the first gear set 23 in the inner space, and one end of the second gear set 24 is plugged into the housing cover 22, and the other end passes through the second hole 21-3 and protrudes outside the housing 21;

[0051] and a third gear set 25 connected between the housing 21 and the housing cover 22 and meshing with the second gear set 24 in the inner space;

[0052] Wherein, the first gear set 23 includes: a first sleeve 23-1, connected to the first hole 21-2; a first gear 23-2, which is inserted into the first sleeve 23-1, with the top passing through the first sleeve 23-1 and plugged into the shell cover 22, and the bottom is set in the first hole 21-2 and blocked by the cover 26; a first gasket 23-3, which is sleeved on the first gear 23-2 and contacts the first sleeve 23-1; a second gear 23-4, which is sleeved on the first gear 23-2 and contacts the first gasket 23-3, and is used to mesh with the output shaft 11; a first pin 23-5, which connects the first gear 23-2 and the second gear 23-4; and a second gasket 23-6, which is sleeved on the first gear 23-2 and contacts the second gear 23-4 and the shell cover 22;

[0053] The first sleeve 23 - 1 is in a “T” shape and is crimped at the first hole 21 - 2 ;

[0054] The first gear 23-2 includes: a first shaft 23-21, which is inserted into the first sleeve 23-1, connected to the first gasket 23-3, the second gear 23-4, the first pin shaft 23-5 and the second gasket 23-6, and plugged into the shell cover 22; and a plurality of first convex teeth 23-22, which are connected to the first shaft 23-21; the first shaft 23-21 and the first convex teeth 23-22 are integrally formed, plugged into the first sleeve 23-1 at the first shaft 23-21, and the first gear 23-2 can rotate freely; the first convex teeth 23-22 are helical teeth;

[0055] The first gasket 23-3 is a circular ring-shaped plate, which is placed between the second gear 23-4 and the first sleeve 23-1 to prevent the second gear 23-4 from directly contacting and wearing the first sleeve 23-1, and the reliability of the structure is good;

[0056] The second gear 23 - 4 has a helical tooth shape and meshes with the output shaft 11 and is rotated in conjunction with the output shaft 11;

[0057] The first pin shaft 23-5 is plugged into the first shaft 23-21 and the second gear 23-4 to connect the first shaft 23-21 and the second gear 23-4, and the assembly is relatively convenient;

[0058] The second gasket 23-6 is a circular ring-shaped piece, which is placed between the second gear 23-4 and the shell cover 22 to prevent the second gear 23-4 from directly contacting and wearing the shell cover 22, and the reliability of the structure is good;

[0059] The second gear set 24 includes: a second sleeve 24-1, connected to the second hole 21-3; a second shaft 24-2, inserted into the second sleeve 24-1, one end of which is plugged into the shell cover 22, and the other end of which passes through the second hole 21-3 and protrudes from the outside of the shell 21; a third gasket 24-3, sleeved on the second shaft 24-2, in contact with the second sleeve 24-1; a third gear 24-4, sleeved on the second shaft 24-2, in contact with the third gasket 24-3, and meshed with the first convex teeth 23-22 and the third gear set 25; and a second pin 24-5, inserted into the second shaft 24-2, connected to the third gear 24-4;

[0060] The second sleeve 24 - 1 has a “T”-shaped structure and is crimped at the second hole 21 - 3 ;

[0061] The second shaft 24-2 is a circular shaft, plugged into the second shaft sleeve 24-1, and the second shaft 24-2 can rotate freely;

[0062] The third gasket 24-3 is a circular ring-shaped plate, which is placed between the second sleeve 24-1 and the third gear 24-4 to prevent the second sleeve 24-1 and the third gear 24-4 from direct contact and wear, and the reliability of the structure is good;

[0063] The third gear 24-4 includes: a wheel body 24-41, which is a stepped structure, sleeved on the second shaft 24-2, and positioned by the second pin 24-5; a plurality of second convex teeth 24-42, evenly distributed on the large outer circle of the wheel body 24-41, for meshing with the first convex teeth 23-22; and a plurality of third convex teeth 24-43, evenly distributed on the small outer circle of the wheel body 24-41, spaced apart from the second convex teeth 24-42, for meshing with the third gear set 25;

[0064] The wheel body 24-41 has a second through hole 24-41-1 and two grooves 24-41-2 in the middle; the second through hole 24-41-1 is used to be plugged with the second shaft 24-2; the grooves 24-41-2 are symmetrically arranged on both sides of the second through hole 24-41-1, the grooves 24-41-2 are connected to the second through hole 24-41-1, and the height dimension of the grooves 24-41-2 is smaller than the height dimension of the second through hole 24-41-1; the grooves 24-41-2 are used to accommodate the second pin shaft 24-5;

[0065] The wheel body 24-41 is sleeved on the second shaft 24-2 through the second through hole 24-41-1, and the second pin shaft 24-5 is inserted on the second shaft 24-2. When the wheel body 24-41 is sleeved on the second shaft 24-2, the second pin shaft 24-5 enters the groove 24-41-2, and the third gear 24-4 is connected with the second shaft 24-2 and the second pin shaft 24-5. When the third gear 24-4 is linked to rotate by the first gear 23-2, the third gear 24-4 links the second shaft 24-2 and the second pin shaft 24-5 to rotate together;

[0066] The second convex teeth 24-42 are helical teeth, meshing with the first convex teeth 23-22, so that the first gear 23-2 can be linked with the third gear 24-4 to rotate;

[0067] The third convex tooth 24-43 is an umbrella-shaped tooth, meshing with the fourth convex tooth 25-2, linking the third gear set 25 to rotate;

[0068] The housing 21 also has an escape space 21-4, which is connected to the first hole 21-2 and accommodates a portion of the wheel body 24-41 and a portion of the second protruding teeth 24-42. The escape space 21-4 is provided so that the third gear 24-4 can mesh with the first gear 23-2, and the space is fully utilized, making the structure relatively compact.

[0069] The third gear set 25 comprises: a gear body 25-1, connected to the positioning cavity 21-5 formed between the housing 21 and the housing cover 22, and one end of the gear body 25-1 is arranged in the inner space; and a plurality of fourth convex teeth 25-2, evenly distributed on one end of the gear body 25-1, meshing with the third convex teeth 24-43; the gear body 25-1 is positioned at the positioning cavity 21-5, and the assembly is convenient; the fourth convex teeth 25-2 are umbrella-shaped teeth, meshing with the third convex teeth 24-43;

[0070] The gear box 20 further includes: a cover 26 connected to the first hole 21-2, spaced apart from the other end of the first gear set 23, and blocking the first gear set 23; the cover 26 is provided, such as a rubber cover, to form a barrier to prevent dust from entering, and is relatively beautiful;

[0071] The working principle is as follows: During assembly: first, connect the housing 21 to the single-phase series-excited motor 10 by inserting the screw 30 through the first through hole 21-11 on the convex edge 21-1;

[0072] The first sleeve 23-1 is crimped at the first hole 21-2, the first gear 23-2 is connected to the first sleeve 23-1, the first washer 23-3, the second gear 23-4, the first pin 23-5 and the second washer 23-6 are sequentially connected to the first shaft 23-21 on the first gear 23-2, and the second gear 23-4 is meshed with the output shaft 11 on the single-phase series motor 10;

[0073] The second sleeve 24-1 is pressed at the second hole 21-3, the second sleeve 24-1 is connected to the second shaft 24-2, and the third gasket 24-3, the third gear 24-4 and the second pin 24-5 are sequentially connected to the second shaft 24-2, so that the third gear 24-4 is meshed with the first gear 23-2;

[0074] The third gear set 25 is connected to the positioning cavity 21 - 5 , and the third gear set 25 is meshed with the third gear 24 - 4 ;

[0075] Put on the shell cover 22, and the shell cover 22 is connected to the shell body 21 by bolts;

[0076] It is realized that there will be no collision during assembly, the meshing position is relatively consistent, the assembly is relatively convenient, and the assembly accuracy is relatively uniform;

[0077] When in use: the single-phase series motor 10 is powered on, the output shaft 11 rotates, and the second gear 23-4 rotates, thereby the first gear 23-2 rotates, and the first gear 23-2 rotates in conjunction with the third gear 24-4, thereby the second shaft 24-2 and the third gear set 25 rotate;

[0078] In the description, it should be understood that the terms "upper", "lower", "left", "right", "front", "back" and the like indicating directions or positional relationships are based on the positional relationships described in the drawings and are only for the convenience of description or simplified description, rather than indicating specific directions that must be possessed; the operation process described in the embodiments is not an absolute usage procedure and corresponding adjustments may be made in actual use;

[0079] Unless otherwise defined, the technical or scientific terms used herein shall have the usual meanings understood by persons with ordinary skills in the relevant field; the words "first", "second" and similar words used in the specification and claims do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "a" do not necessarily indicate a quantity limitation, but indicate the existence of at least one, which needs to be determined according to the content of the embodiment;

[0080] The above is only a preferred specific implementation method, but the protection scope is not limited to it. Any technician familiar with this technical field can make equivalent substitutions or changes based on the technical solutions and inventive concepts within the disclosed technical scope, which should be covered by the protection scope.

Claims

1. The combined structure of a single-phase series-excited motor and a gearbox includes: Single-phase series-excited motor (10); and a gear box (20), one end of which is connected to the single-phase series-excited motor (10); characterized in that: The gear box (20) comprises: a housing (21), the housing (21) having a first space; and a housing cover (22), which is arranged separately from the housing (21), the housing cover (22) having a second space, and after the housing cover (22) is connected to the housing (21), the first space and the second space are combined into an inner space; One end of the housing (21) has a convex edge (21-1), and the convex edge (21-1) has four first through holes (21-11), through which screws (30) are inserted one by one to connect the single-phase series-excited motor (10), and the output shaft (11) on the single-phase series-excited motor (10) passes through the convex edge (21-1) to enter the inner space; The convex edge (21-1) protrudes out of the first space, and after the shell cover (22) is connected to the shell body (21), the top of the convex edge (21-1) is higher than the top of the shell cover (22).

2. The combined structure of a single-phase series-excited motor and a gearbox according to claim 1, characterized in that: The gear box (20) further comprises: a first gear set (23), connected to a first hole (21-2) on the housing (21), meshing with the output shaft (11) in the inner space, and one end of the first gear set (23) is plugged into the housing cover (22); A second gear set (24) is connected to a second hole (21-3) on the housing (21) and meshes with the first gear set (23) in the inner space; one end of the second gear set (24) is plugged into the housing cover (22), and the other end passes through the second hole (21-3) and protrudes outside the housing (21); and a third gear set (25) connected between the housing (21) and the housing cover (22) and meshing with the second gear set (24) in the inner space.

3. The combined structure of a single-phase series-excited motor and a gearbox according to claim 2, characterized in that: The gear box (20) further comprises: a cover (26) connected to the first hole (21-2) and spaced apart from the other end of the first gear set (23) to block the first gear set (23).

4. The combined structure of a single-phase series-excited motor and a gearbox according to claim 3, characterized in that: The first gear set (23) comprises: a first shaft sleeve (23-1) connected to the first hole (21-2); a first gear (23-2) inserted into the first shaft sleeve (23-1), with the top of the first shaft sleeve (23-1) inserted into the shell cover (22), and the bottom of the first shaft sleeve (23-2) blocked by the cover (26); a first gasket (23-3) sleeved on the first gear (23-2) and in contact with the first shaft sleeve (23-1); a second gear (23-4) sleeved on the first gear (23-2) and in contact with the first gasket (23-3) for meshing with the output shaft (11); a first pin shaft (23-5) connecting the first gear (23-2) and the second gear (23-4); and a second gasket (23-6) sleeved on the first gear (23-2) and in contact with the second gear (23-4) and the shell cover (22).

5. The combined structure of a single-phase series-excited motor and a gearbox according to claim 4, characterized in that: The first gear (23-2) comprises: a first shaft (23-21) which passes through the first shaft sleeve (23-1), connects the first gasket (23-3), the second gear (23-4), the first pin shaft (23-5) and the second gasket (23-6), and is plugged into the shell cover (22); and a plurality of first protruding teeth (23-22) which are connected to the first shaft (23-21).

6. The combined structure of a single-phase series-excited motor and a gearbox according to claim 5, characterized in that: The second gear set (24) comprises: a second shaft sleeve (24-1) connected to the second hole (21-3); a second shaft (24-2) inserted into the second shaft sleeve (24-1), one end of which is plugged into the shell cover (22), and the other end of which passes through the second hole (21-3) and protrudes outside the shell (21); a third gasket (24-3) sleeved on the second shaft (24-2) and in contact with the second shaft sleeve (24-1); a third gear (24-4) sleeved on the second shaft (24-2), in contact with the third gasket (24-3), and meshed with the first convex teeth (23-22) and the third gear set (25); and a second pin shaft (24-5) inserted into the second shaft (24-2) and connected to the third gear (24-4).

7. The combined structure of a single-phase series-excited motor and a gearbox according to claim 6, characterized in that: The third gear (24-4) comprises: a wheel body (24-41), the wheel body (24-41) being a stepped structure, sleeved on the second shaft (24-2), and positioned by the second pin shaft (24-5); A plurality of second convex teeth (24-42) are evenly distributed on the large outer circle of the wheel body (24-41) and are used to mesh with the first convex teeth (23-22); and a plurality of third convex teeth (24-43), which are evenly distributed on the small outer circle of the wheel body (24-41), are arranged at intervals from the second convex teeth (24-42), and are used to mesh with the third gear set (25).

8. The combined structure of a single-phase series-excited motor and a gearbox according to claim 7, characterized in that: The wheel body (24-41) has a second through hole (24-41-1) and two grooves (24-41-2) at a middle position; The second through hole (24-41-1) is used for plugging with the second shaft (24-2); The groove (24-41-2) is symmetrically arranged on both sides of the second through hole (24-41-1), the groove (24-41-2) is connected to the second through hole (24-41-1), and the height dimension of the groove (24-41-2) is smaller than the height dimension of the second through hole (24-41-1); The groove (24-41-2) is used to accommodate the second pin shaft (24-5).

9. The combined structure of a single-phase series-excited motor and a gearbox according to claim 8, characterized in that: The housing (21) also has an escape space (21-4), the escape space (21-4) being in communication with the first hole (21-2) and accommodating a portion of the wheel body (24-41) and a portion of the second protruding teeth (24-42).

10. The combined structure of a single-phase series-excited motor and a gear box according to claim 9, characterized in that: The third gear set (25) comprises: a gear body (25-1) connected to a positioning cavity (21-5) formed between the housing (21) and the housing cover (22), with one end of the gear body (25-1) disposed in the inner space; and a plurality of fourth convex teeth (25-2) evenly distributed on one end of the gear body (25-1) and meshing with the third convex teeth (24-43).

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