Gear motor
By tilting the gear box with respect to the motor body, the problem of interference between the motor output shaft and the gear box during the operation of the reduction motor is solved, and noise reduction and system stability are achieved.
Patent Information
- Application Number
- CN202311264579.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-09-27
- Publication Date
- 2025-03-28
AI Technical Summary
During the assembly and operation of the reduction motor, the motor output shaft may interfere with the gear box, resulting in noise.
By presetting the gear box to incline to one side with respect to the motor body, the inclination direction is approximately the same as the reaction force direction received by the load load of the output gear, so that the concentricity between the motor output shaft and the gear box is maintained when the load is driven.
It effectively avoids interference between the motor output shaft and the gear box, reduces motor noise, and improves the stability of the system.
Smart Images
Figure CN119712811A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of electromechanics, and in particular to a reduction motor. Background Art
[0002] A reduction motor is a combination of a gear part (transmission part) and a motor body. Usually, the motor output shaft of the motor body engages with the gear contained in the gear box to transmit the motor power to the output gear to drive the load. Since reduction motors have the advantages of serialization and modularization, they can widely meet customer needs, and more and more industries and enterprises choose to use reduction motors.
[0003] In order to avoid interference between the motor output shaft and the gearbox, the concentricity of the motor body and the gearbox needs to be ensured when assembling the reduction motor. The prior art is to set the abutment surface of the gearbox and the motor body to be perpendicular to the motor output shaft, or to support the gearbox by multiple supporting surfaces perpendicular to the motor output shaft, and the multiple supporting surfaces are evenly distributed in the circumferential direction of the motor output shaft.
[0004] It should be noted that the above introduction to the technical background is only for the convenience of providing a clear and complete description of the technical solutions of the present application and for the convenience of understanding by those skilled in the art. It cannot be considered that the above technical solutions are well known to those skilled in the art simply because they are described in the background technology section of the present application. Summary of the invention
[0005] The inventor discovered that while the concentricity of the motor body and the gearbox was ensured during assembly, when the reduction motor was installed in an actual system for operation, the output gear was subjected to a reaction force applied by the load when driving the load. This reaction force would act on the motor output shaft through the gears in the gearbox, causing the motor output shaft to tilt to one side and interfere with the gearbox, generating motor noise.
[0006] In response to at least one of the above problems or other similar problems, an embodiment of the present application provides a reduction motor to avoid noise generated by interference between the motor output shaft and the gear box when the motor is running.
[0007] According to an embodiment of the present application, a reduction motor is provided, the reduction motor comprising a motor body and a transmission part, the motor body comprising a motor output shaft, and the transmission part comprising:
[0008] a transmission gear meshing with the motor output shaft,
[0009] an output gear, which is supported by the transmission shaft and drives an external load,
[0010] a gear box that accommodates the transmission gear, and at least a portion of the gear box abuts against one axial side of the motor body,
[0011] The gear box is arranged on the motor body at an angle relative to the motor output shaft, and the gear box has an opposing surface opposite to one axial side of the motor body. When the gear box is parallel to the motor output shaft, the position of the lowest point of the opposing surface satisfies: in a plane perpendicular to the motor output shaft, in a coordinate system with the center point of the motor output shaft as the origin and the line connecting the origin and the center point of the transmission gear as the X-coordinate axis, when a straight line passing through the origin and parallel to the inclination direction of the teeth of the output gear passes through the quadrant where the output gear is located, the lowest point is located in the quadrant opposite to the quadrant where the output gear is located with respect to the X-axis; when a straight line passing through the origin and parallel to the inclination direction of the teeth of the output gear does not pass through the quadrant where the output gear is located, the lowest point is located in the quadrant where the output gear is located, wherein the lowest point is the position on the opposing surface closest to the motor body when the gear box is parallel to the motor output shaft.
[0012] One beneficial effect of the embodiments of the present application is that by pre-setting the gearbox to be tilted toward one side relative to the motor body, the tilting direction is roughly the same as the direction in which the motor output shaft is tilted by the reaction force from the load applied to the output gear when carrying the load. Therefore, when the output gear is carrying the load, the motor output shaft is tilted by the reaction force applied by the load and can maintain concentricity with the gearbox, thereby avoiding interference between the motor output shaft and the gearbox and reducing motor noise.
[0013] With reference to the following description and accompanying drawings, the specific embodiments of the present application are disclosed in detail, indicating the way in which the principles of the present application can be adopted. It should be understood that the embodiments of the present application are not limited in scope. Within the scope of the spirit and clauses of the appended claims, the embodiments of the present application include many changes, modifications and equivalents. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] The included drawings are used to provide a further understanding of the embodiments of the present application, which constitute a part of the specification, are used to illustrate the implementation methods of the present application, and together with the text description, explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:
[0015] Figure 1 is a top view of the reduction motor of an embodiment of the present application;
[0016] Figure 2 yes Figure 1 A cross-sectional view of the reduction motor shown along the BB direction;
[0017] Figure 3 yes Figure 1 A cross-sectional view of the reduction motor shown along the CC direction;
[0018] Figure 4 is a schematic diagram for explaining that the gear box of the embodiment of the present application is tilted relative to the motor body;
[0019] Figure 5 is a schematic diagram of a gearbox according to an embodiment of the present application viewed from one direction;
[0020] Figure 6 is a schematic diagram for explaining the setting position of the first protrusion in the embodiment of the present application;
[0021] Figure 7 is another schematic diagram for explaining the setting position of the first protrusion in the embodiment of the present application;
[0022] Figure 8 Yes Figure 7 A schematic diagram for explaining the situation shown;
[0023] Fig. 9 is another schematic diagram for explaining the setting position of the first protrusion in the embodiment of the present application;
[0024] Fig.10 Yes Fig. 9 A schematic diagram for explaining the situation shown;
[0025] Fig.11 It is a schematic diagram of an implementation of a protrusion in an embodiment of the present application. DETAILED DESCRIPTION
[0026] With reference to the accompanying drawings, the above and other features of the present application will become apparent through the following description. In the description and the accompanying drawings, specific embodiments of the present application are specifically disclosed, which show some embodiments in which the principles of the present application can be adopted. It should be understood that the present application is not limited to the described embodiments. On the contrary, the present application includes all modifications, variations and equivalents falling within the scope of the attached claims.
[0027] In the embodiments of the present application, the terms "first", "second", "upper", "lower", etc. are used to distinguish different elements in terms of title, but do not indicate the spatial arrangement or time order of these elements, etc., and these elements should not be limited by these terms. The term "and / or" includes any one and all combinations of one or more of the associated listed terms. The terms "comprising", "including", "having", etc. refer to the presence of the stated features, elements, components or components, but do not exclude the presence or addition of one or more other features, elements, components or components.
[0028] In the embodiments of the present application, the singular forms "a", "the", etc. include plural forms and should be broadly understood as "a kind" or "a type" rather than being limited to the meaning of "one"; in addition, the term "said" should be understood to include both singular and plural forms, unless the context clearly indicates otherwise. In addition, the term "according to" should be understood as "at least in part according to...", and the term "based on" should be understood as "at least in part based on...", unless the context clearly indicates otherwise.
[0029] In addition, in the following description of the present application, for the convenience of explanation, the direction along the central axis OO of the motor output shaft or the direction parallel to it is referred to as "axial" or "axial extension direction", the radial direction centered on the central axis is referred to as "radial", the side away from the central axis OO along the radial direction is referred to as "radial outer side", the side close to the central axis OO along the radial direction is referred to as "radial inner side", and the direction around the central axis is referred to as "circumferential".
[0030] The embodiments of the present application are described below with reference to the accompanying drawings.
[0031] An embodiment of the present application provides a reduction motor, which can be applied to an automobile. For example, the reduction motor can be a sunroof motor of an automobile, but the embodiment of the present application does not limit the application scope of the reduction motor. Figure 1 is a top view of the reduction motor of the embodiment of the present application, Figure 2 yes Figure 1 A cross-sectional view of the reduction motor along the BB direction is shown. Figure 3 yes Figure 1 A cross-sectional view of the reduction motor along the CC direction is shown.
[0032] like Figure 1 As shown, the reduction motor 1 includes a motor body 10 and a transmission part 20 , and the motor power in the motor body 10 is transmitted to the load to be driven through the transmission part 20 .
[0033] like Figure 2 As shown, the motor body 10 includes a motor output shaft 110. In addition, the motor body 10 may also include a housing, a cover or flange covering an opening of the housing, a stator and a rotor accommodated by the housing, and other unidentified components. The specific structure of the motor body 10 may refer to the relevant technology, and the embodiment of the present application is not limited to this.
[0034] like Figure 2 As shown, the transmission unit 20 includes a transmission gear 210, an output gear 220 and a gear box 230. The transmission gear 210 is engaged with the motor output shaft 110. The transmission gear 210 has a transmission shaft 211. The output gear 220 is supported by the transmission shaft 211 and is used to drive an external load, such as Figure 3 As shown, the gear box 230 houses the transmission gear 210 .
[0035] like Figure 3 As shown, at least a portion of the gear box 230 abuts against one axial side of the motor body 10. For example, the gear box 230 accommodates the motor output shaft 110 extending from the motor body 10, and the portion located radially outside the motor output shaft 110 abuts against the motor body 10, for example, abuts against the upper surface of the cover or flange (not shown in the figure). In addition, the components of the motor body 10 that abut against the gear box 230 can be set according to actual needs, and can also refer to related technologies, and the embodiments of the present application are not limited to this.
[0036] In the embodiments of the present application, without causing ambiguity, for the convenience of explanation, the side close to the gearbox in the axial direction is sometimes referred to as the "one axial side", the side close to the motor body is referred to as the "other axial side", the direction from the motor body to the gearbox in the axial direction is referred to as "up", and the direction from the gearbox to the motor body in the axial direction is referred to as "down". In addition, it is worth noting that "up" and "down" are used to distinguish different elements in terms of titles, but do not indicate the spatial arrangement or time sequence of these elements, etc. These elements should not be limited by these terms.
[0037] In some embodiments, the number of transmission gears 210 included in the gear box 230 can be set according to actual needs. The embodiment of the present application is described by taking one transmission gear 210 as an example, but the embodiment of the present application does not limit the number of transmission gears 210.
[0038] In addition, the extension direction of the transmission shaft 211 of the transmission gear 210 can also be set according to actual needs. The embodiment of the present application takes the extension direction of the transmission shaft 211 as perpendicular to the extension direction of the motor output shaft 110 as an example for explanation, but those skilled in the art should understand that for a reduction motor with the extension direction of the transmission shaft 211 in other directions, the various implementations of the embodiment of the present application are also applicable. The embodiment of the present application does not limit the extension direction of the transmission shaft 211.
[0039] Figure 4 It is a schematic diagram for explaining that the gear box in the embodiment of the present application is tilted relative to the motor body.
[0040] In some embodiments, the gear box 230 is tilted relative to the motor output shaft 110 on the motor body 10 , and the tilting direction is, for example, substantially the same as the direction in which the motor output shaft 110 tilts due to the reaction force from the load when the output gear 220 carries a load.
[0041] In other words, if Figure 4As shown, the gear box 230 has an opposing surface 231 that is opposite to one axial side of the motor body 10. Figure 4 When the gear box 230 is parallel to the central axis OO of the motor output shaft 110, that is, when the gear box 230 is parallel to the central axis OO of the motor output shaft 110, the opposing surface 231 is inclined relative to the central axis OO, and the lowest point M of the opposing surface 231 is the point closest to the motor body 10. The position of the lowest point M on the opposing surface 231 satisfies: in a plane perpendicular to the motor output shaft, in a coordinate system in which the center point of the motor output shaft is taken as the origin and the line connecting the origin and the center point of the transmission gear is taken as the X-coordinate axis, when a straight line through the origin parallel to the inclination direction of the teeth of the output gear passes through the quadrant where the output gear is located, the lowest point M is located in the quadrant opposite to the quadrant where the output gear is located with respect to the X-axis; when a straight line through the origin parallel to the inclination direction of the teeth of the output gear does not pass through the quadrant where the output gear is located, the lowest point M is located in the quadrant where the output gear is located.
[0042] In addition, in the embodiment of the present application, the gear box 230 being parallel to the motor output shaft 110 means that the central axis of the portion of the gear box 230 that accommodates the motor output shaft 110 is parallel to the central axis of the motor output shaft 110 .
[0043] Therefore, when the gear box 230 is arranged on the motor body 10, the inclination direction of the gear box 230 relative to the motor output shaft 110 is roughly the same as the direction in which the motor output shaft 110 is inclined due to the reaction force from the load when the output gear 220 is carrying a load. Therefore, when the output gear 220 is carrying a load, the motor output shaft 110 is inclined due to the reaction force applied by the load and can maintain concentricity with the gear box 230, thereby avoiding interference between the motor output shaft 110 and the gear box 230 and reducing motor noise.
[0044] In the embodiment of the present application, the gear box 230 and the motor body 10 can, for example, be abutted against one axial side of the motor body 10 through the opposing surface 231, and the gear box 230 and the motor body 10 can also be abutted by a protrusion. The specific abutment method can be selected as needed, and the embodiment of the present application is not limited to this.
[0045] The following description takes abutment by means of protrusions as an example, but those skilled in the art should understand that various implementations of the embodiments of the present application can be applicable to any abutment method.
[0046] Figure 5 is a schematic diagram of the gearbox of the embodiment of the present application viewed from one direction, Figure 5 The gearbox 230 is shown viewed from below.
[0047] In some embodiments, Figure 5As shown, the gear box 230 and the motor body 10 ( Figure 5 The opposing surface 231 on the axial side of the motor body 10 (not shown) has a Figure 5 The protrusion 240 protrudes from the motor body 10 (not shown), and the protrusion 240 includes a first protrusion 241. The first protrusion 241 is connected to the motor body 10 ( Figure 5 The gear box 230 is abutted against one axial side of the motor body 10, so that the gear box 230 is tilted relative to the motor body 10, and the tilting direction is, for example, the output gear 220 ( Figure 5 The motor output shaft 110 ( Figure 5 That is to say, the first protrusion 241 is located at the lowest point of the opposing surface 231, or it can be said that the contact point between the first protrusion 241 and the motor body 10 is the lowest point of the opposing surface 231.
[0048] In the embodiment of the present application, two inclined directions are "approximately the same" means that the straight lines extending from the origin of the rectangular coordinate system along the two inclined directions respectively coincide with each other; or, it means that the angle between the vectors of the two inclined directions does not exceed a predetermined threshold, and the predetermined threshold is, for example, less than 10°, which is not limited in the embodiment of the present application.
[0049] Figures 6 to 10 Schematic diagram for explaining the location of the first protrusion in the embodiment of the present application, wherein: Figure 6 It shows the situation of establishing a rectangular coordinate system in a plane perpendicular to the motor output shaft 110 when looking down at the reduction motor 1 along the axial direction. Figure 7 A situation where the output gear 220 is located in the third quadrant is shown. Figure 8 Yes Figure 7 A simple schematic diagram is provided to illustrate the situation shown. Fig. 9 Another situation is shown in which the output gear 220 is located in the third quadrant. Fig.10 Yes Fig. 9 A simple schematic diagram is provided to illustrate the situation shown.
[0050] Combine the following Figures 6 to 8 A setting position of the first protrusion 241 is described.
[0051] like Figure 6 As shown, in a plane perpendicular to the motor output shaft 110, the center point O of the motor output shaft 110 is set as the origin, and a plane rectangular coordinate system XOY is established with the line connecting the origin O and the center point A of the transmission gear 210 as the X-coordinate axis. The coordinate system divides the plane into four quadrants, namely, the first quadrant I, the second quadrant II, the third quadrant III and the fourth quadrant IV.
[0052] In addition, in the embodiments of the present application, the description of the position of each component in the coordinate system refers to the projection position of each component in the plane where the coordinate system is located, unless otherwise specified.
[0053] like Figure 7 As shown, the output gear 220 is located in the third quadrant III, and the teeth 221 of the output gear 220 are inclined relative to the X-axis and the Y-axis, as shown in FIG. Figure 8 As shown, the inclination direction of the tooth 221 is C1-C1, and the straight line L1 is a straight line parallel to the inclination direction C1-C1 and passing through the origin O, that is, the straight line L1 passing through the origin along the inclination direction, and the straight line L1 passes through the second quadrant II and the fourth quadrant IV, that is, the straight line L1 does not pass through the quadrant where the output gear 220 is located (that is, the third quadrant III).
[0054] like Figure 8 As shown, it is assumed that the output gear 220 rotates in the direction R1, that is, Figure 8 In the figure shown, the output gear 220 rotates from right to left. When the output gear 220 drives an external load, the reaction force applied by the external load on the output gear 220 is F1. The force F1 is transmitted to the motor output shaft 110 through the transmission gear 210, causing the motor output shaft 110 to tilt in the direction from the origin O to the first quadrant I.
[0055] In the above case, the first protrusion 241 can be set on the portion of the opposing surface 231 located in the third quadrant III, that is, the first protrusion 241 is set in the quadrant where the output gear 220 is located (that is, the third quadrant III), for example, the position shown by P1. Then, when the gear box 230 is installed with the motor body 10, since the first protrusion 241 is located in the third quadrant III, the gear box 230 will be tilted in the direction from the origin O to the first quadrant I. The tilting direction is roughly the same as the direction in which the reaction force F1 causes the motor output shaft 110 to tilt. Therefore, when the output gear 220 carries a load, the motor output shaft 110 is tilted by the reaction force applied by the load and can maintain concentricity with the gear box 230, thereby avoiding interference between the motor output shaft 110 and the gear box 230 and reducing motor noise.
[0056] In addition, if Figure 8 As shown, it is assumed that in the actual system, the output gear 220 rotates in the direction R2 opposite to the direction R1, that is, Figure 8In the figure shown, the output gear 220 rotates from left to right. When the output gear 220 drives the external load, the reaction force applied by the external load to the output gear 220 is F1', and the force F1' will not be transmitted to the motor output shaft 110. That is to say, in this case, the motor output shaft 110 will not be tilted due to the force F1'. Then, the axial length of the first protrusion 241 and the specific position of the first protrusion 241 in the third quadrant III can be set according to actual conditions, so that in this case, the motor output shaft 110 will not interfere with the gear box 230. In addition, in this case, the first protrusion may not be provided.
[0057] Combine the following Figure 6 , Fig. 9 and Fig.10 Another arrangement position of the first protrusion 241 is described.
[0058] like Fig. 9 As shown, the output gear 220 is located in the third quadrant III, and the teeth 221 of the output gear 220 are inclined relative to the X-axis and the Y-axis, as shown in FIG. Fig.10 As shown, the inclination direction of the tooth 221 is C2-C2, and the straight line L2 is a straight line parallel to the inclination direction C2-C2 and passing through the origin O, that is, the straight line L2 passing through the origin along the inclination direction, and the straight line L2 passes through the first quadrant I and the third quadrant III, that is, the straight line L2 passes through the quadrant where the output gear 220 is located (that is, the third quadrant III).
[0059] like Fig.10 As shown, it is assumed that the output gear 220 rotates in the direction R1, that is, Fig.10 In the figure shown, the output gear 220 rotates from right to left. When the output gear 220 drives an external load, the reaction force applied by the external load on the output gear 220 is F2. The force F2 is transmitted to the motor output shaft 110 through the transmission gear 210, causing the motor output shaft 110 to tilt in the direction from the origin O to the fourth quadrant IV.
[0060] In the above case, the first protrusion 241 can be set on the part of the opposing surface 231 located in the second quadrant II, that is, the first protrusion 214 is set in the quadrant (that is, the second quadrant II) opposite to the quadrant where the output gear 220 is located (that is, the third quadrant III) with respect to the X-axis, for example, the position shown by P2. Then, when the gear box 230 is installed with the motor body 10, since the first protrusion 241 is located in the second quadrant II, the gear box 230 will be tilted in the direction from the origin O to the fourth quadrant IV. The tilting direction is roughly the same as the direction in which the reaction force F2 causes the motor output shaft 110 to tilt. Therefore, when the output gear 220 carries a load, the motor output shaft 110 is tilted by the reaction force applied by the load and can maintain concentricity with the gear box 230, thereby avoiding interference between the motor output shaft 110 and the gear box 230 and reducing motor noise.
[0061] In addition, if Fig.10 As shown, it is assumed that in the actual system, the output gear 220 rotates in the direction R2 opposite to the direction R1, that is, Fig.10 In the figure shown, the output gear 220 rotates from left to right. When the output gear 220 drives the external load, the reaction force applied by the external load to the output gear 220 is F2', and the force F2' will not be transmitted to the motor output shaft 110. That is to say, in this case, the motor output shaft 110 will not be tilted due to the force F1'. The axial length of the first protrusion 241 and the specific position of the first protrusion 241 in the second quadrant II can be set according to actual conditions, so that in this case, the motor output shaft 110 will not interfere with the gear box 230. In addition, in this case, the first protrusion may not be provided.
[0062] The above describes the setting position of the first protrusion 241 by taking the output gear 220 located in the third quadrant III as an example. The cases where the output gear is located in the first quadrant I, the second quadrant II and the fourth quadrant IV are similar to the case where the output gear 220 is located in the third quadrant III, and will not be described in detail here.
[0063] That is to say, the position at which the first protrusion 241 is arranged on the opposing surface 231 satisfies: in the above-mentioned rectangular coordinate system, when a straight line passing through the origin parallel to the inclination direction of the teeth 221 of the output gear 220 passes through the quadrant where the output gear 220 is located, the first protrusion 241 is arranged in the quadrant opposite to the quadrant where the output gear 220 is located with respect to the X-axis; when a straight line passing through the origin parallel to the inclination direction of the teeth 221 of the output gear 220 does not pass through the quadrant where the output gear 220 is located, the first protrusion 241 is arranged in the quadrant where the output gear 220 is located.
[0064] Thus, the gear box 230 is pre-set to be inclined toward one side relative to the motor body 10 through the first protrusion 241, and the inclination direction is roughly the same as the direction in which the motor output shaft 110 is inclined due to the reaction force from the load applied by the output gear 220 when it carries the load. Therefore, when the output gear 220 carries the load, the motor output shaft 110 is inclined due to the reaction force applied by the load and can maintain concentricity with the gear box 230, thereby avoiding interference between the motor output shaft 110 and the gear box 230 and reducing motor noise.
[0065] In the above example, one first protrusion 241 is used as an example for explanation. For the case of multiple first protrusions, multiple first protrusions can be set in quadrants that meet the above description, or at least one first protrusion can be set in a quadrant that meets the above description, and other first protrusions can be set in other quadrants, but the overall axial length of the first protrusions set in other quadrants should be shorter than the overall axial length of the first protrusions set in the quadrant that meets the above description. The "overall length" described in the embodiment of the present application can be the maximum value of the axial length, the minimum value of the axial length, or the average value of the axial length.
[0066] In addition, the embodiment of the present application does not limit the number of the first protrusions 241. Figure 5 The first protrusion 241 shown in the figure is in the shape of an elongated strip, but the first protrusion 241 may also be in a circle or any other shape. The embodiment of the present application does not limit the shape of the first protrusion 241.
[0067] In some embodiments, Figure 5 As shown, the protrusion 240 may further include a second protrusion 242, and the axial length of the second protrusion 242 is shorter than the axial length of the first protrusion 241. Thus, by arranging the second protrusion 242 in the gap between the gear box 230 and the motor body 10 caused by the first protrusion 241, it is ensured that the gear box 230 and the motor body 10 are reliably abutted, and the concentricity of the gear box 230 and the motor body 10 is ensured.
[0068] The axial length of the first protrusion 241 and the axial length of the second protrusion 242 can be set according to actual conditions, for example, the axial length of the first protrusion 241 is determined according to the maximum reaction force that may be applied by the load, the size and weight of the motor body 10, and the axial length of the second protrusion 242 is determined according to the axial length of the first protrusion 241 and the size parameters of the motor body 10. The embodiment of the present application is not limited to this.
[0069] In addition, if Figure 5 As shown, the protrusion 240 may include a plurality of second protrusions 242. The embodiment of the present application does not limit the number of the second protrusions 242. For example, only one second protrusion 242 may be provided. Figure 5 The second protrusion 242 shown in the figure is circular, but the second protrusion 242 may also be any other shape, and the embodiment of the present application does not limit the shape of the second protrusion 242.
[0070] In some embodiments, the center positions of the protrusions 240 are evenly distributed in the circumferential direction. Figure 5 As shown, the center position of one first protrusion 241 and the center positions of five second protrusions 242 are equally divided in the circumferential direction, that is, the six center positions are evenly distributed in the circumferential direction. In addition, in the case of including other numbers of protrusions 240, the implementation is similar and will not be repeated here.
[0071] This ensures that the gear box 230 is in stable contact with the motor body 10 . In addition, it helps to simplify the molding process of the gear box 230 .
[0072] In some embodiments, Figure 5 As shown, the first protrusion 241 faces the motor body 10 ( Figure 5 The area of the first surface 241a on the axial side of the second protrusion 242 (not shown) is larger than the area of the second protrusion 242 facing the motor body 10 ( Figure 5 The area of the second surface 242a on the axial side of the gear box 230 (not marked in the figure) is further ensured to be reliably abutted against the motor body 10, and the concentricity of the gear box 230 and the motor body 10 is ensured. In addition, the area of the first surface 241a is larger than the area of the second surface 242a. Under the same force, the pressure borne by the first surface 241a is smaller than the pressure borne by the second surface 242a, thereby preventing the first protrusion 241 from being deformed by pressure and ensuring the integrity of the first protrusion 241.
[0073] In some embodiments, the gear box 230 is riveted to the motor body 10, and a rivet portion (not shown) of the gear box 230 is spaced from the first protrusion 241 in the circumferential direction. Thus, the rivet portion is prevented from squeezing the first protrusion 241 and causing deformation of the first protrusion 241. Optionally, in the above coordinate system, the rivet portion can be set in a quadrant different from the quadrant where the first protrusion 241 is located.
[0074] Fig.11 It is a schematic diagram of an implementation of a protrusion in an embodiment of the present application.
[0075] In some embodiments, Fig.11As shown, the closer at least a portion of the first protrusion 241 is to the radial inner side, the smaller the axial length is. As a result, the contact area between the first surface 241a of the first protrusion 241 and the motor body 10 can be increased, achieving more reliable contact. Optionally, when the second protrusion 242 is provided, the closer at least a portion of the second protrusion 242, which is 180° apart from the first protrusion 241, is to the radial outer side, the smaller the axial length is, thereby further enabling the gear box 230 to reliably contact the motor body 10.
[0076] In some embodiments, Figure 2 As shown, there is a gap between the outer circumferential surface of the transmission shaft 211 of the transmission gear 210 and the inner wall of the gear box 230. Thus, when the first protrusion 241 adjusts the gear box 230, the transmission shaft 211 is prevented from interfering with the gear box 230.
[0077] In some embodiments, Figure 2 As shown, there is a gap between the outer circumferential surface of the motor output shaft 110 and the inner wall of the gear box 230. Thus, when the first protrusion 241 adjusts the gear box 230, interference between the motor output shaft 110 and the gear box 230 is prevented.
[0078] It can be seen from the above embodiments that by pre-setting the gearbox to be tilted toward one side relative to the motor body, the tilting direction is roughly the same as the direction in which the motor output shaft is tilted due to the reaction force from the load applied to the output gear when the output gear is carrying a load. Therefore, when the output gear is carrying a load, the motor output shaft is tilted due to the reaction force applied by the load and can maintain concentricity with the gearbox, thereby avoiding interference between the motor output shaft and the gearbox and reducing motor noise.
[0079] The present application is described above in conjunction with specific implementation methods, but it should be clear to those skilled in the art that these descriptions are exemplary and are not intended to limit the scope of protection of the present application. Those skilled in the art can make various modifications and variations to the present application based on the spirit and principles of the present application, and these modifications and variations are also within the scope of the present application.
Claims
1. A reduction motor, comprising a motor body and a transmission part, wherein the motor body comprises a motor output shaft, and the transmission part comprises: a transmission gear meshing with the motor output shaft, an output gear, which is supported by the transmission shaft of the transmission gear and drives an external load, a gear box that accommodates the transmission gear, and at least a portion of the gear box abuts against one axial side of the motor body, It is characterized in that The gear box is arranged on the motor body at an angle relative to the motor output shaft, and the gear box has an opposing surface opposite to one axial side of the motor body. When the gear box is parallel to the motor output shaft, the position of the lowest point of the opposing surface satisfies: in a plane perpendicular to the motor output shaft, in a coordinate system with the center point of the motor output shaft as the origin and the line connecting the origin and the center point of the transmission gear as the X-coordinate axis, when a straight line passing through the origin and parallel to the inclination direction of the teeth of the output gear passes through the quadrant where the output gear is located, the lowest point is located in the quadrant opposite to the quadrant where the output gear is located with respect to the X-axis; when a straight line passing through the origin and parallel to the inclination direction of the teeth of the output gear does not pass through the quadrant where the output gear is located, the lowest point is located in the quadrant where the output gear is located, wherein the lowest point is the position on the opposing surface closest to the motor body when the gear box is parallel to the motor output shaft.
2. The reduction motor according to claim 1, wherein: The opposing surface has a protrusion protruding toward the motor body, and the protrusion includes a first protrusion, the first protrusion abuts against one axial side of the motor body, and the first protrusion is located at the lowest point.
3. The reduction motor according to claim 2, wherein: The protrusions further include a second protrusion having an axial length shorter than an axial length of the first protrusion.
4. The reduction motor according to claim 3, wherein: The center positions of the protrusions are evenly distributed in the circumferential direction.
5. The reduction motor according to claim 3, wherein: An area of a first surface of the first protrusion facing one axial side of the motor body is greater than an area of a second surface of the second protrusion facing one axial side of the motor body.
6. The reduction motor according to claim 2, wherein: The gear box is riveted to the motor body, and a rivet portion of the gear box is spaced from the first protrusion in a circumferential direction.
7. The reduction motor according to claim 2, wherein: At least a portion of the first protrusion has an axial length that decreases as it approaches the radial inner side.
8. The reduction motor according to claim 2, wherein: There is a gap between the outer peripheral surface of the transmission shaft of the transmission gear and the inner wall of the gear box.
9. The reduction motor according to claim 2, wherein: There is a gap between the outer peripheral surface of the motor output shaft and the inner wall of the gear box.