Shock absorption and noise reduction structure of motor

Abstract

A vibration and noise reduction structure of a motor (1) includes: a rotor shaft (111); a rotor (112); a transmission mechanism (12) that transmits the torque of the rotor to an external device; a base (13) on which a transmission mechanism is mounted, the transmission mechanism comprising at least a primary gear and a final gear, the primary gear meshing with the rotor gear, the final gear being integral with the output shaft, transmitting torque to an external device, a damping mechanism being provided in a structure in which the primary gear is mounted on the base, the damping mechanism comprising: a first part capable of rotating coaxially and synchronously with the primary gear, and a second part capable of rotating coaxially and synchronously with the final gear; comprising extension parts (1212, 161) extending towards the base side; second members (15, 15B) attached to the base and formed in a cylindrical shape extending from the base toward the first member; a third member (14) that is formed of an elastic material, that forms a stopper section that accommodates the extension section of the first member and restricts the rotation range of the extension section, and that is in elastic contact with the second member; the primary gear rotating shaft penetrates through the primary gear, the first component and the second component and is fixed to the base, and the primary gear and the first component can rotate around the primary gear rotating shaft.

Description

Technical Field

[0001] The present invention relates to the technical field of vibration reduction and noise reduction, and in particular to a vibration reduction and noise reduction structure for a transmission mechanism in a motor. Background Art

[0002] In the prior art, motors are often used in equipment that requires a quiet environment, such as conference rooms, living rooms, offices, hospitals, etc. (such as air conditioners, projectors, printers, etc.). In order to maintain a quiet environment, the noise and vibration of the motors in various devices in the above environments are required to be as small as possible.

[0003] As shown in FIG. 1 , the motor 1A includes: a rotor shaft (111A) fixed to the motor housing; a rotor 112A, wherein the rotor is sleeved on the outer circumference of the rotor shaft, and a rotor gear is provided on the upper outer circumference thereof, so that the rotor can rotate around the rotor shaft; a transmission mechanism, wherein the transmission mechanism includes a first gear 121A (i.e., a primary gear) meshed with the rotor gear 112A, a second gear 123A (i.e., an intermediate gear) meshed with the first gear, a third gear 125A (i.e., an intermediate gear) meshed with the second gear, and an output gear 127A (i.e., a final gear) meshed with the third gear, wherein the output gear 127A is provided with an output shaft 128A; and a base 13A, wherein the base is used to support and fix the transmission mechanism.

[0004] In the motor 1A constructed as described above, the output shaft 128A rotates under the action of the following two driving forces: first, an external unidirectional load generated by the gravity of the weight lowered by the output shaft 128A and / or the spring pulling force is applied to the output shaft 128A, causing the output shaft 128A to rotate; second, the rotation of the rotor 112A is transmitted to the final gear 127A via the rotor gear, causing the output shaft 128A to rotate.

[0005] When the driving output shaft 128A in the first case rotates in the same direction as the driving output shaft 128A in the second case, the torques applied to the gears by the two driving forces are in the same direction, and a backlash will be generated between the meshing gears, such as between the primary gear and the rotor gear. In this way, the meshing between the two meshing gears will be interrupted, causing the two gears to collide and generate noise. Summary of the invention

[0006] The present invention is completed in view of the above-mentioned technical problems, and its purpose is to provide a shock-absorbing and noise-reducing structure of a motor, which can avoid the generation of tooth gap between two mutually meshing gears of each gear even when the direction of the torque applied from the rotor to the output shaft is the same as the direction of the torque applied to the output shaft by an external unidirectional load, thereby preventing vibration and noise caused by the tooth gap.

[0007] In order to achieve the above-mentioned purpose, the first aspect of the present invention provides a vibration reduction and noise reduction structure of a motor, comprising: a rotor shaft, which is fixed to a motor housing; a rotor, which is sleeved on the outer circumference of the rotor shaft and can rotate around the rotor shaft, and a rotor gear is arranged on the upper outer circumference; a transmission mechanism, which transmits the torque of the rotor to an external device; and a base, which is provided for the installation of the transmission mechanism, wherein the transmission mechanism includes at least a primary gear and a final gear, the primary gear is meshed with the rotor gear, the final gear rotates integrally with the output shaft to output the torque to the external device, and a damping mechanism is arranged in the structure for installing the primary gear on the base, and the damping mechanism The mechanism includes: a first component, which can rotate synchronously with the primary gear coaxially and includes an extension portion extending toward the base side; a second component, which is fixed to the base and formed into a cylindrical shape extending from the base toward the first component side; a third component, which is formed of an elastic material, forms a limit portion for accommodating the extension portion of the first component and limiting the rotation range of the extension portion, and is in elastic contact with the elastic inner circumferential surface of the second component; and a primary gear shaft, which passes through the primary gear, the first component and the second component and is fixed to the base, and the primary gear and the first component can rotate around the primary gear shaft.

[0008] According to the vibration reduction and noise reduction structure of the motor constructed as described above, since the damping mechanism is included, the damping mechanism includes: a first component, which can rotate synchronously with the primary gear coaxially and includes a protruding portion extending toward the base side; a second component, which is fixed to the base and formed into a cylindrical shape extending from the base toward the first component side; a third component, which is formed of an elastic material and forms a limiter for accommodating the protruding portion of the first component and limiting the rotation range of the protruding portion, and elastically contacts with the inner circumferential surface of the second component; and a primary gear rotating shaft, which penetrates the primary gear, the first component and the second component and is fixed to the base, and the primary gear and the first component can rotate around the primary gear rotating shaft. Therefore, even if the direction of the torque applied to the first gear from the rotor is the same as the direction of the torque applied to the first gear by the external unidirectional load, the torque of the first gear increases instantaneously, the instantaneous increase of the torque can be timely suppressed by the damping mechanism, so that the backlash between the first gear and the second gear meshing with the first gear and between the first gear and the rotor gear meshing with the first gear can be avoided, thereby avoiding vibration and noise caused by the backlash.

[0009] The vibration reduction and noise reduction structure of the motor according to the second aspect of the present invention is based on the vibration reduction and noise reduction structure of the motor according to the first aspect of the present invention, and is characterized in that the first component is formed separately from the primary gear, includes a cylindrical main body, and the extension portion extends from the main body toward the base side.

[0010] According to the shock-absorbing and noise-reducing structure of the motor constructed as described above, since the first component is formed separately from the primary gear, including a cylindrical main body and an extension portion extending from the main body toward the base side, when the extension portion is worn, there is no need to replace the first gear, and the first component can be directly replaced, so the operation is simple.

[0011] The vibration reduction and noise reduction structure of the motor according to the third aspect of the present invention is based on the vibration reduction and noise reduction structure of the motor according to the first aspect of the present invention, and is characterized in that the first component is formed integrally with the primary gear, and the extension portion extends from the primary gear toward the base side.

[0012] According to the vibration and noise reduction structure of the motor configured as described above, since the first component is integrally formed with the primary gear and the extension portion extends from the primary gear toward the base, there is no need to form a separate component for the extension portion, thereby reducing the number of components.

[0013] A motor vibration reduction and noise reduction structure according to a fourth aspect of the present invention is based on the motor vibration reduction and noise reduction structure according to the first aspect of the present invention, and is characterized in that the second component is formed integrally with the base.

[0014] According to the vibration reduction and noise reduction structure of the motor configured as described above, since the second member is formed integrally with the base, the damping mechanism can function better.

[0015] A motor vibration reduction and noise reduction structure according to a fifth aspect of the present invention is based on the motor vibration reduction and noise reduction structure according to the first aspect of the present invention, and is characterized in that the second component is formed separately from the base.

[0016] According to the vibration reduction and noise reduction structure of the motor constructed as described above, since the second component and the base are formed separately, even if the second component is worn, there is no need to replace the base, and the second component can be directly replaced, so the operation is simple.

[0017] The vibration reduction and noise reduction structure of the motor according to the sixth aspect of the present invention is based on the vibration reduction and noise reduction structure of the motor according to the first aspect of the present invention, and is characterized in that the third component includes a cylindrical center portion and two roughly arc-shaped cantilever portions extending radially outward from the center portion and continuing to extend circumferentially, and the limiting portion is formed as a roughly arc-shaped limiting groove formed by the space between the outer circumferential surface of the center portion and the inner circumferential surface of the cantilever portion.

[0018] According to the shock-absorbing and noise-reducing structure of the motor constructed as described above, since the third component includes a central portion and two roughly arc-shaped cantilever portions extending radially outward from the central portion and continuing to extend circumferentially, the limiting portion is formed as a roughly arc-shaped limiting groove formed by the space between the outer circumferential surface of the central portion and the inner circumferential surface of the cantilever portion. Therefore, the movement of the protruding portion along the circumferential direction can be limited by the limiting groove.

[0019] The vibration reduction and noise reduction structure of the motor according to the seventh aspect of the present invention is based on the vibration reduction and noise reduction structure of the motor according to the sixth aspect of the present invention, and is characterized in that if the direction in which the rotor causes the primary gear to rotate and the direction in which the external unidirectional load causes the primary gear to rotate are both set as the first direction, and the direction opposite to the first direction is set as the second direction, a first limiting wall is formed at the front end portion of the limiting groove in the first direction to prevent the extension portion from rotating in the first direction, a second limiting wall is formed on the radially outer side of the limiting groove to prevent the extension portion from flying radially outward, and a third limiting wall is formed at the front end portion of the limiting groove in the second direction to match the shape of the front end portion of the extension portion in the second direction.

[0020] According to the shock absorbing and noise reduction structure of the motor constructed as described above, by setting the direction in which the rotor causes the primary gear to rotate and the direction in which the external unidirectional load causes the primary gear to rotate as a first direction, setting the direction opposite to the first direction as a second direction, and forming the front end portion of the limiting groove in the first direction as a first limiting wall that prevents the protruding portion from rotating in the first direction, and forming the front end portion of the limiting groove in the second direction as a third limiting wall that matches the shape of the front end portion of the protruding portion in the second direction and a second limiting wall located between the first limiting wall and the third limiting wall, the rotation of the protruding portion in the first direction can be suppressed, and the rotation of the protruding portion in the second direction can be guided.

[0021] The shock-absorbing and noise-reducing structure of the motor of the eighth aspect of the present invention is based on the shock-absorbing and noise-reducing structure of the motor of the seventh aspect of the present invention, and the front end portion of the protruding portion in the second direction is formed into a thin front end shape that gradually becomes thinner toward the second direction, and correspondingly, the third limiting wall is formed into a thin front end shape that gradually becomes thinner toward the second direction.

[0022] According to the shock-absorbing and noise-reducing structure of the motor constructed as described above, since the front end portion of the extension portion in the second direction is formed into a thin front end shape that gradually becomes thinner toward the second direction, correspondingly, the third limiting wall is formed into a thin front end shape that gradually becomes thinner toward the second direction. Therefore, when the extension portion rotates toward the second direction, it is convenient to guide the extension portion toward the third limiting wall.

[0023] The vibration-damping and noise-reducing structure of the motor according to the ninth aspect of the present invention is based on the vibration-damping and noise-reducing structure of the eighth aspect of the present invention, and is characterized in that the first direction is counterclockwise and the second direction is clockwise.

[0024] According to the shock-absorbing and noise-reducing structure of the motor constructed as described above, since the first direction is counterclockwise and the second direction is clockwise, the damping mechanism can prevent the first gear from rotating counterclockwise to reduce the vibration and noise caused by the tooth gap generated by the counterclockwise rotation of the first gear.

[0025] The vibration-damping and noise-reducing structure of the motor according to the tenth aspect of the present invention is based on the vibration-damping and noise-reducing structure of the eighth aspect of the present invention, and is characterized in that the first direction is clockwise and the second direction is counterclockwise.

[0026] According to the shock-absorbing and noise-reducing structure constructed as described above, since the first direction is clockwise and the second direction is counterclockwise, the damping mechanism can prevent the first gear from rotating in the clockwise direction to reduce vibration and noise caused by the tooth gap generated by the clockwise rotation of the first gear.

[0027] The vibration-damping and noise-reduction structure of the motor of the eleventh aspect of the present invention is based on the vibration-damping and noise-reduction structure of the motor of any one of the first to tenth aspects of the present invention, and is characterized in that, in addition to the protruding portion, the first component also includes a protrusion for preventing the third component from being inverted, and correspondingly, a groove for accommodating the protrusion is formed in the third component.

[0028] According to the vibration reduction and noise reduction structure constructed as described above, the first component includes, in addition to the protruding portion, a protrusion for preventing the third component from being inverted. Correspondingly, a groove for accommodating the protrusion is formed in the third component. Therefore, by installing the protrusion in the groove, the third component can be prevented from being inverted.

[0029] The vibration reduction and noise reduction structure of the motor of the twelfth aspect of the present invention is based on the vibration reduction and noise reduction structure of the motor of any one of the first to tenth aspects of the present invention, and is characterized in that a cone is formed on the peripheral portion of the first component on the side of the third component, and the cone is formed so that the diameter becomes smaller as it moves toward the third component.

[0030] According to the shock-absorbing and noise-reducing structure of the motor constructed as described above, since a tapered portion is formed on the peripheral portion of the first component on the side of the third component, and the tapered portion is formed so that its diameter becomes smaller as it approaches the third component, the third component that flies radially outward under the action of centrifugal force can be guided to smoothly gather radially inward without being hooked. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0032] Figure 1A Schematic diagram showing the overall structure of a conventional motor vibration reduction and noise reduction structure.

[0033] Figure 1B Yes means Figure 1A Schematic diagram of the meshing state of multiple gears in the transmission mechanism.

[0034] Figure 2A 1 is a schematic diagram showing the overall structure of the vibration and noise reduction structure of the motor according to the first embodiment of the present invention.

[0035] Figure 2B 1 is a schematic diagram showing a meshing state between a rotor gear and a first gear in the vibration and noise reduction structure of a motor according to the first embodiment of the present invention.

[0036] Figure 3 It means from Figure 2B Schematic diagram of the rubber brake and the first gear when viewed from the Z2 side toward the Z1 side.

[0037] Figure 4 Yes means Figure 3 Schematic diagram of the first gear rotating clockwise.

[0038] Figure 5 Yes means Figure 3 Schematic diagram of the first gear rotating counterclockwise.

[0039] Fig. 6A It means from Figure 3 Schematic diagram of the friction force generated between the rubber brake and the inner circumferential surface of the brake wall when the first gear rotates counterclockwise when viewed from the Z2 side to the Z1 side.

[0040] Figure 6B This is a schematic diagram showing the friction force generated between the rubber brake member and the inner peripheral surface of the brake wall when cut along the XZ plane.

[0041] Fig. 7A 1 is a schematic diagram showing the overall structure of a vibration and noise reduction structure of a motor according to a second embodiment of the present invention.

[0042] Figure 7B Yes means Fig. 7A An exploded perspective view of the various components of the damping mechanism.

[0043] Fig. 8A It means from Figure 7B An exploded perspective view of the various components of the damping mechanism when viewed from the Z2 side toward the Z1 side. Figure 8B is a schematic diagram showing the assembled damping mechanism.

[0044] Fig. 9 Yes means Figure 8B Schematic diagram of the first gear rotating clockwise.

[0045] Fig.10 Yes means Figure 8B Schematic diagram of the first gear rotating counterclockwise.

[0046] FIG. 11 shows Fig.10 Schematic diagram of the friction force generated between the rubber brake member and the inner surface of the brake wall.

[0047] Fig.12 Schematic diagrams showing states of a rubber brake member of a motor noise reduction structure in the first embodiment and the second embodiment and each modified example of the present invention when a cantilever portion is momentarily reversed.

[0048] (Explanation of symbols)

[0049] 1 motor;

[0050] 111 rotor shaft;

[0051] 112 rotor gear;

[0052] 113 rotor;

[0053] 12 Transmission mechanism;

[0054] 121 first gear;

[0055] 1211 a first gear main body;

[0056] 12111 Large diameter part;

[0057] 12112 Trail Division;

[0058] 1212 extension;

[0059] 12121 front end;

[0060] 12122 base end;

[0061] 1213 convex;

[0062] 1214 cone;

[0063] 122 first gear shaft;

[0064] 123 2nd gear;

[0065] 124 second gear shaft;

[0066] 125 3rd gear;

[0067] 126 third gear shaft;

[0068] 127 4th gear;

[0069] 128 output shaft;

[0070] 13 base;

[0071] 14 Rubber brake parts;

[0072] 141 Central Department;

[0073] 142 cantilever part;

[0074] 1421 Anti-flip slot;

[0075] 143 limit slot;

[0076] 1431 first limiting wall;

[0077] 1432 second limiting wall;

[0078] 1433 third limiting wall;

[0079] 14331 hook;

[0080] 15 brake wall;

[0081] 129 Fifth Gear;

[0082] 12H fifth gear shaft;

[0083] 16 first component;

[0084] 161 extension;

[0085] 1611 front end;

[0086] 1612 base end;

[0087] 162 convex;

[0088] 163 storage hole;

[0089] 164 cone;

[0090] 15B Braking wall;

[0091] CW: clockwise (when viewed from the Z2 side to the Z1 side);

[0092] CCW: counterclockwise (when viewed from the Z2 side to the Z1 side);

[0093] T1 is the torque generated by the rotor 113;

[0094] T2 Torque caused by external unidirectional load. DETAILED DESCRIPTION

[0095] 2 to 3. Fig.12 The various embodiments of the vibration reduction and noise reduction structure of the motor of the present invention are described. Figure 2A A unified coordinate system is used in detail in Figure 11. Figure 2A The overall structure diagram of the vibration reduction and noise reduction structure in the reference standard is used as the reference standard, among which Figure 2A The extension direction of each gear shaft in the embodiment is set as the Z direction, one side of the Z direction is set as the Z1 side, and the other side of the Z direction is set as the Z2 side. The long side direction of the base 13 is set as the X direction, one side of the X direction is set as the X1 side, and the other side of the X direction is set as the X2 side. The short side direction of the base 13 is set as the Y direction, one side of the Y direction is set as the Y1 side, and the other side of the Y direction is set as the Y2 side. In order to more clearly explain the rotation direction of each gear in each embodiment,

[0096] It should be noted that in the first embodiment and its variant examples, the so-called "clockwise direction" refers to Figure 5 The clockwise rotation direction of the first gear 121 when viewed from the Z2 side to the Z1 side is shown in FIG. Figure 5 The counterclockwise rotation direction of the first gear 121 when viewed from the Z2 side to the Z1 side is shown.

[0097] Below, refer to FIG. 2A to FIG. 6B A vibration and noise reduction structure of a motor according to a first embodiment of the present invention will be described in detail.

[0098] (First Embodiment)

[0099] (Overall structure)

[0100] As shown in Figure 2, the vibration reduction and noise reduction structure of the motor 1 of this embodiment mainly includes: a rotor 113 that generates an original driving force for the output shaft 128, the rotor is composed of a rotor magnet not shown in the figure and a rotor gear 112 arranged at the end of the rotor 113, and a rotor shaft 111 is penetrated in the rotor; a transmission mechanism 12, the transmission mechanism is composed of a plurality of gears and is used to transmit the torque from the rotor 111 to an external device; and a base 13, the base 13 is used to support the transmission mechanism 12.

[0101] The transmission mechanism 12 , as shown in FIG. 2 , includes a first gear 121 , a first gear shaft 122 , a second gear 123 , a second gear shaft 124 , a third gear 125 , a third gear shaft 126 , a fourth gear 127 , and an output shaft 128 . Among them, the first gear 121 is meshed with the rotor gear 112, the first gear shaft 122 penetrates the first gear 121 and is installed on the base 13 in a manner that can rotate synchronously with the first gear 121, the second gear 123 is meshed with the first gear 121, the second gear shaft 124 penetrates the second gear 123 and is installed on the base 13 in a manner that can rotate synchronously with the second gear 123, the third gear 125 is meshed with the second gear 123 and is installed on the base 13 in a manner that can rotate synchronously with the second gear 123, the third gear shaft 126 penetrates the third gear 125 and is installed on the base 13 in a manner that can rotate synchronously with the third gear 125, the fourth gear 127 is meshed with the third gear 125 and is installed on the base 13 in a manner that can rotate synchronously with the third gear 125, and the output shaft 128 penetrates the fourth gear 127 and is installed on the base 13 in a manner that can rotate synchronously with the fourth gear 127.

[0102] Thus, the torque generated by the rotor 113 is transmitted to the external device via the first to fourth gears 121 to 127 and the output shaft 128. In this embodiment, the external device is a weight attached to the output shaft 128, and the external unidirectional load is the gravity generated by the weight.

[0103] The first gear 121 constitutes a primary gear, the second gear 123 and the third gear 125 constitute an intermediate gear, and the fourth gear 127 constitutes a final gear.

[0104] In addition, there is a damping mechanism in the structure where the first gear 121 is installed on the base 13. The damping mechanism is used to prevent the torque applied to each gear from increasing instantly when the direction of the torque applied from the rotor to the first gear is the same as the direction of the torque applied from the external unidirectional load to the first gear, which is counterclockwise, thereby causing a tooth gap between the meshing gears, causing the meshing between the gears to become chaotic and interrupted, and causing collisions between the gears to generate noise.

[0105] As shown in Figure 2, the damping mechanism includes an extension portion 1212 of the first gear 121, a rubber brake member 14, and a brake wall 15, wherein the first gear 121 includes a first gear main body portion 1211, which is coaxially formed with a large diameter portion 12111 and a small diameter portion 12112; and two extension portions 1212 (i.e., the first component), the two extension portions respectively extend from the Z2 side surface of the small diameter portion 12112 to the Z2 side, and when observed from the Z2 side to the Z1 side, the extension portion 1212 is formed into a roughly circular arc shape; and a rod-shaped protrusion 1213, the protrusion 1213 also extends from the Z2 side surface of the small diameter portion 12112 to the Z2 side, and is circumferentially located between the two extension portions 1212.

[0106] In this embodiment, the extension 1212 and the protrusion 1213 are integrally formed with the small diameter portion 12112. In addition, a conical portion 1214 whose diameter gradually decreases from the Z1 side toward the Z2 side is formed on the Z2 side surface of the small diameter portion 12112 of the first gear body 1211 of the first gear 121.

[0107] Next, the rubber brake member 14 (i.e., the third component) is Figure 3 The overall structure shown is formed into an S shape when viewed from the Z2 side to the Z1 side, and is composed of a cylindrical center portion 141 located approximately in the center, and a cantilever portion 142 extending radially outward from two points on the outer circumferential surface of the center portion 141, then extending counterclockwise from the radial outside along the circumferential direction, and hooking back at the end portion; and a limiting groove 143, which is surrounded by the outer circumferential surface of the center portion 141 and the inner circumferential surface of the cantilever portion 142 to form a generally circular arc shape as a whole, which accommodates the protruding portion 1212 and limits the circumferential movement of the protruding portion 1212.

[0108] Moreover, as shown in Figures 2 and 3, an anti-flip groove 1421 is also formed at a position of a cantilever portion 142 of the rubber brake member 14 corresponding to the protrusion 1213 in the Z direction. The anti-flip groove 1421 is used to accommodate the protrusion 1213 to limit the rubber brake member 14 to an S shape when viewed from the Z2 side to the Z1 side, so as to prevent the rubber brake member 14 from being flipped.

[0109] 2, the brake wall 15 (i.e., the second component) is cylindrical and fixed to the base 13 by pressing or riveting, and receives the rubber brake member 14 in a manner that it can elastically contact the outer peripheral surface of the rubber brake member 14. In this embodiment, the brake wall 15 is made of a rigid material.

[0110] The protruding portion 1212 of the first gear 121 , the rubber brake 14 and the brake wall 15 are installed in the following manner: the two protruding portions 1212 are embedded in the limiting groove 143 of the rubber brake 14 along the Z direction, and then the installed rubber brake 14 is installed in the brake wall 15 .

[0111] In order to more clearly explain the working principle of inserting the extension portion 1212 of the first gear 121 into the limiting groove 143 of the rubber brake member 14 to limit or guide the movement of the rubber brake member 14 along the circumferential direction, Figures 3 to 5 In the figure, the first gear 121 and the rubber brake member 14 are shown upside down.

[0112] Limiting groove 143 as Figure 4 , Figure 5 One end in the counterclockwise direction (CCW direction, i.e., the first direction) shown in the figure constitutes a first limiting wall 1431, which limits the rotation of the protruding portion 1212 in the counterclockwise direction (CCW direction); a second limiting wall 1432, which limits the movement of the protruding portion 1212 toward the radial outside; and a third limiting wall 1433, which is in the shape of a pointed angle and limits the rotation of the protruding portion 1212 in the clockwise direction (CW direction, i.e., the second direction).

[0113] Correspondingly, the extension portion 1212 is as follows Figure 4 , 5 As shown, one end 12122 in the counterclockwise direction is formed into a shape corresponding to the first limiting wall 1431 of the limiting groove 143 ; and one end 12121 in the clockwise direction is formed into a front end thin shape corresponding to the third limiting wall 1433 of the limiting groove 143 .

[0114] According to the damping mechanism assembled in the above manner, when the rotor 113 rotates counterclockwise, the first gear 121 Figure 4 As shown, the second gear 123 rotates in the counterclockwise direction accordingly, the third gear 125 rotates in the clockwise direction accordingly, and the fourth gear 127 drives the output shaft 128 to rotate in the counterclockwise direction.

[0115] At this time, the external unidirectional load (in this embodiment, the external unidirectional load is smaller than the torque of the rotor 113) causes the output shaft 128 to drive the fourth gear 127 to rotate in a clockwise direction, the third gear 125 rotates in a counterclockwise direction accordingly, the second gear 123 rotates in a clockwise direction accordingly, and the first gear 121 rotates in a counterclockwise direction accordingly.

[0116] In this way, the rotation directions of the torque applied to each gear by the rotor and the external unidirectional load are opposite, and the torque applied to each gear becomes smaller, so that no backlash is generated between two mutually meshing gears of each gear. Therefore, the meshing of each gear, such as the first gear 121, with other gears is not interrupted, and the motor 1 operates normally.

[0117] In this case, the extension 1212 is as shown in FIG. Figure 4 As shown, it rotates clockwise until its front end portion 12121 is embedded in the third limiting wall 1433 of the third limiting groove 143 of the rubber brake 14, thereby driving the cantilever portion 142 of the rubber brake 14 to converge radially inward, thereby, the outer circumferential surface of the rubber brake 14 leaves the inner circumferential surface of the brake wall 15, and the damping mechanism arranged between the primary gear 121 and the base 13 will not take effect.

[0118] On the other hand, when the rotor 113 rotates clockwise, the first gear 121 rotates clockwise. Figure 5 As shown, the second gear 123 rotates in the clockwise direction accordingly, the third gear 125 rotates in the counterclockwise direction accordingly, and the fourth gear 127 drives the output shaft 128 to rotate in the clockwise direction.

[0119] At this time, the external unidirectional load causes the output shaft 128 to drive the fourth gear 127 to rotate clockwise, the third gear 125 to rotate counterclockwise accordingly, the second gear 123 to rotate clockwise accordingly, and the first gear 121 to rotate counterclockwise accordingly.

[0120] In this way, the rotation directions of the torques applied to the gears by the rotor 113 and the external unidirectional load are the same, and the torques applied to the gears increase instantly, causing a backlash between two meshing gears in each gear. As a result, the meshing between the two gears is interrupted, and the teeth collide with each other, thereby generating vibration and noise.

[0121] In this case, the extension 1212 is as shown in FIG. Figure 5 As shown in the figure, the rubber brake 14 is rotated counterclockwise until its base end portion 12122 slides into the first limiting wall 1431 of the third limiting groove 143 of the rubber brake 14 through the second limiting wall 1432, and the base end portion 12122 abuts against the first limiting wall 1431 and drives the rubber brake 14 to continue rotating in the counterclockwise direction, thereby, the rubber brake 14 will be as shown in the figure. Figure 5As shown by the arrow in the rightmost figure in the figure, a centrifugal force is generated. Under the action of the centrifugal force, the front end of the cantilever portion 142 of the rubber brake 14 tends to fly outward in the radial direction and elastically abuts against the brake wall 15. In this way, a friction force F in the clockwise direction is generated between the rubber brake 14 and the brake wall 15, and the friction force F prevents the rubber brake 14 from rotating in the counterclockwise direction. As a result, the extension portion 1212 of the first gear 121 can be prevented from rotating in the counterclockwise direction.

[0122] That is, when the direction of the torque applied from the rotor 113 to the first gear 121 is the same as the direction of the torque applied from the external unidirectional load to the first gear 121, both of which are counterclockwise, the damping mechanism can prevent the counterclockwise torque of the first gear 121 from increasing instantly, so that no backlash will be generated between the first gear 121 and the rotor gear 112 meshing therewith, and between the first gear 121 and the second gear 123 meshing therewith. In this way, the following situations can be avoided: the meshing between the first gear 121 and the rotor gear 112 and between the first gear 121 and the second gear 123 is interrupted, and the teeth collide with each other to generate vibration and noise.

[0123] In addition, as described above, a cone 1214 is formed on the Z2 side surface of the small diameter portion 12112 of the first gear body 1211 of the first gear 121. Therefore, the cantilever portion 142 of the rubber brake member 14 that attempts to fly outward in the radial direction under the action of the centrifugal force is stopped by the friction force F and then turns back to the radial inside. At this time, since the cone 1214 is formed in a cone shape that gradually converges toward the center from the Z1 side to the Z2 side, the cone 1214 can guide the cantilever portion 142 of the rubber brake member 14 to converge smoothly inward in the radial direction. Thus, the vibration reduction and noise reduction of the motor 1 are achieved.

[0124] (Variation 1 of the First Embodiment)

[0125] In the first embodiment described above, the direction of the torque applied from the rotor 113 to the first gear 121 and the direction of the torque applied from the external unidirectional load to the first gear 121 are both counterclockwise. In other words, the direction of the torque applied from the rotor 113 to the output shaft 128 and the direction of the torque applied from the external unidirectional load to the output shaft 128 are the same and both are clockwise. That is, the first direction is set to the counterclockwise direction, and the second direction is set to the clockwise direction. In the above case, the rubber brake 14 is set to be S-shaped when viewed from the Z2 side to the Z1 side.

[0126] However, the present invention is not limited thereto, and may also be configured such that the direction T1 of the torque applied from the rotor 113 to the first gear 121 and the direction T2 of the torque applied from the external unidirectional load to the first gear 121 are both in the clockwise direction, in other words, the direction of the torque applied from the rotor 113 to the output shaft 128 and the direction of the torque applied from the external unidirectional load to the output shaft 128 are both in the counterclockwise direction. That is, the first direction is set to the clockwise direction, and the second direction is set to the counterclockwise direction. In the above case, the rubber brake 14 is set to be S-shaped when viewed from the Z1 side to the Z2 side, that is, the rubber brake 14 is turned upside down.

[0127] Thus, when the direction T1 of the torque applied to the first gear 121 by the rotor 113 and the direction T2 of the torque applied to the first gear 121 by the external unidirectional load are both in the clockwise direction, the extension 1212 of the first gear 121 rotates clockwise along with the first gear 121. Thus, a friction force in the counterclockwise direction is generated between the rubber brake 14 and the brake wall 15, and the friction force prevents the clockwise torque of the first gear 121 from increasing instantly, thereby preventing the meshing between the first gear 121 and the adjacent gear meshing therewith from being interrupted, and preventing the collision between the teeth to generate vibration and noise.

[0128] According to the present modification 1, vibration reduction and noise reduction can be achieved in the same manner as in the above-mentioned first embodiment.

[0129] (Variation 2 of the first embodiment)

[0130] In the above-mentioned first embodiment, the extension portion 1212 is formed integrally with the small diameter portion 12112 of the first gear body portion 1211 of the first gear 121, but the present invention is not limited to this. The extension portion 1212 and the small diameter portion 12112 of the first gear body portion 1211 of the first gear 121 can also be formed separately.

[0131] Thus, when the extension portion 1212 abuts against the limiting groove 143 of the driving rubber brake member 14 and is worn, only the extension portion 1212 needs to be replaced without replacing the entire first gear 121. Thus, the replacement operation can be simple and easy to operate.

[0132] (Variation 3 of the first embodiment)

[0133] In the first embodiment, the brake wall 15 is formed separately from the base 13 and is fixed to the base 13 by pressing or riveting, but the present invention is not limited to this. The brake wall 15 can be formed integrally with the base 13 and can be fixed to the base 13 in any other manner.

[0134] In this way, when the brake wall 15 is worn due to frictional contact with the rubber brake member 14, only the brake wall 15 needs to be replaced without replacing the entire base 13. Thus, the replacement operation can be simplified and easy to operate.

[0135] (Second Embodiment)

[0136] Above, refer to FIG. 2A to FIG. 6B The vibration and noise reduction structure of the motor 1 according to the first embodiment of the present invention has been described.

[0137] Below, refer to 7A to 11B The vibration reduction and noise reduction structure of the motor 1 of the second embodiment of the present invention is described. The vibration reduction and noise reduction structure of the motor 1 of this embodiment is different from the first embodiment mentioned above in that: (1) the transmission mechanism 12 also includes a fifth gear 129 and a fifth gear shaft 12H, and the fifth gear 129 is located between the third gear 125 and the fourth gear 127 and meshes with both.

[0138] (2) It also includes a first component 16 that is separate from the first gear 121, and a storage hole 163 is formed on the Z1 side end surface of the first component 16, which is recessed toward the Z2 side and is used to accommodate the small diameter portion 12112 of the first gear 121, and two protruding portions 161 are formed on the Z2 side end surface of the first component 16, extending toward the Z2 side, and a protrusion 162 is formed between the two protruding portions 161 and protruding toward the Z2 side.

[0139] (3) The brake wall 15B is formed integrally with the base 13 .

[0140] Therefore, in this embodiment and its variants, the definitions of "clockwise direction" and "counterclockwise direction" are the same as those of the first embodiment and its variants. Fig. 8A , 8B The clockwise rotation direction of the first gear 121 when viewed from the Z2 side to the Z1 side is shown in FIG. Fig. 8A , 8B The counterclockwise rotation direction of the first gear 121 when viewed from the Z2 side to the Z1 side is shown.

[0141] (4) The tapered portion 164 is formed on the peripheral edge of the Z2 side end surface of the first member 16 .

[0142] Regarding (1) above, if Fig. 7AAs shown, the transmission mechanism 12 includes a fifth gear 129 and a fifth gear shaft 12H in addition to the first gear 121, the first gear shaft 122, the second gear 123, the second gear shaft 124, the third gear 125, the third gear shaft 126, the fourth gear 127 and the output shaft 128 as in the first embodiment described above. The fifth gear 129 is located between the third gear 125 and the fourth gear 127 and meshes with the third gear 125 and the fourth gear 127.

[0143] Regarding (2) above, if Figure 7B As shown, the first component 16 and the first gear 121 are separately arranged, and the first component 16 has a storage hole 163 recessed toward the Z2 side and used to accommodate the small diameter portion 12112 of the first gear 121 formed on its Z1 side surface, and two extension portions 161 extending toward the Z2 side are formed on the Z2 side surface, and a rod-shaped protrusion 162 (for anti-inversion) is also provided between the two extension portions 161.

[0144] Correspondingly, if Figure 7B As shown, an anti-reverse groove 1421 is formed at a position of the cantilever portion 142 of the rubber brake 14 corresponding to the protrusion 162 in the Z direction. By fitting the protrusion 162 into the anti-reverse groove 1421, the rubber brake 14 can be limited to an S shape when viewed from the Z2 side to the Z1 side.

[0145] Regarding (3) above, if Figure 7B As shown, the brake wall 15B is formed integrally with the base 13 .

[0146] In the present embodiment, the damping mechanism in the vibration and noise reduction structure of the motor 1 is constituted by the two protruding portions 161 of the first component 16 , the rubber brake member 14 and the brake wall 15B.

[0147] By constructing the damping mechanism as described above, when the rotor 113 (refer to Figure 2A ) rotates counterclockwise, the first gear 121 Fig. 9 As shown, if the rotor 113 rotates clockwise, the second gear 123 rotates counterclockwise accordingly, the third gear 125 rotates clockwise accordingly, the fifth gear 129 rotates counterclockwise accordingly, and the fourth gear 127 drives the output shaft 128 to rotate clockwise. That is, the counterclockwise rotation from the rotor 113 is transmitted to the fourth gear 127 via the first gear 121, the second gear 123, the third gear 125, and the fifth gear 129.

[0148] At this time, the external unidirectional load (in the present embodiment, the external unidirectional load is also smaller than the torque of the rotor 113) causes the output shaft 128 to drive the fourth gear 127 to rotate counterclockwise, the fifth gear 129 rotates clockwise accordingly, the third gear 125 rotates counterclockwise accordingly, the second gear 123 rotates clockwise accordingly, and the first gear 121 rotates counterclockwise accordingly.

[0149] In this way, the rotation directions of the torque applied to each gear by the rotor 113 and the external unidirectional load are opposite, and the torque applied to each gear becomes smaller, so that no backlash is generated between two gears meshing with each other. Therefore, the meshing between each gear, such as the first gear 121 and the gear meshing therewith, is not interrupted, and the motor 1 operates normally.

[0150] In this case, the extension 161 is as shown in FIG. Fig. 9 As shown in the figure, it rotates clockwise until its front end portion 1611 is embedded in the third limiting wall 1433 of the third limiting groove 143 of the rubber brake 14, thereby driving the cantilever portion 142 of the rubber brake 14 to converge radially inward, thereby, the outer circumferential surface of the rubber brake 14 leaves the inner circumferential surface of the brake wall 15, and the damping mechanism arranged between the primary gear and the base 13 will not take effect.

[0151] On the other hand, when the rotor 113 rotates in the clockwise direction, the first gear 121 Fig.10 As shown, the shaft 120 rotates counterclockwise, the second gear 123 rotates clockwise accordingly, the third gear 125 rotates counterclockwise accordingly, the fifth gear 129 rotates clockwise accordingly, and the fourth gear 127 drives the output shaft 128 to rotate counterclockwise.

[0152] At this time, the external unidirectional load causes the output shaft 128 to drive the fourth gear 127 to rotate counterclockwise, the fifth gear 129 to rotate clockwise accordingly, the third gear 125 to rotate counterclockwise accordingly, the second gear 123 to rotate clockwise accordingly, and the first gear 121 to rotate counterclockwise accordingly.

[0153] In this way, the rotation directions of the torques applied to each gear by the rotor 113 and the external unidirectional load are the same, and the torque applied to each gear increases instantly, causing a backlash between two meshing gears in each gear. As a result, the meshing between the two gears is interrupted, and the teeth collide with each other, thereby generating noise.

[0154] In this case, the extension 161 is as shown in FIG. Fig.10As shown in the figure, the rubber brake 14 is rotated counterclockwise until its base end portion 1612 slides into the first limiting wall 1431 of the third limiting groove 143 of the rubber brake 14 through the second limiting wall 1432, and the base end portion 1612 abuts against the first limiting wall 1431 and drives the rubber brake 14 to continue to rotate counterclockwise, thereby, the rubber brake 14 will be as shown in the figure. Fig.10 As shown by the arrow in the rightmost figure in FIG. , a centrifugal force is generated. Under the action of this centrifugal force, the front end portion of the cantilever portion 142 of the rubber brake member 14 tends to fly outward in the radial direction and elastically abuts against the brake wall 15B.

[0155] Thus, a friction force FB in the clockwise direction is generated between the rubber brake 14 and the brake wall 15B, and the friction force FB prevents the rubber brake 14 from rotating in the counterclockwise direction. Thus, the extension portion 161 of the first member 16 is prevented from rotating in the counterclockwise direction.

[0156] That is, when the direction of the torque applied from the rotor 113 to the first gear 121 is the same as the direction of the torque applied from the external unidirectional load to the first gear 121, both of which are counterclockwise, the damping mechanism can prevent the counterclockwise torque of the first gear 121 from increasing instantly, so that no backlash will be generated between the first gear 121 and the rotor gear 112 meshing therewith, and between the first gear 121 and the second gear 123 meshing therewith. In this way, the following situations can be avoided: the meshing between the first gear 121 and the rotor gear 112 and between the first gear 121 and the second gear 123 is interrupted, and the teeth collide with each other to generate vibration and noise.

[0157] Regarding (4) above, in addition to the extension 161 and the projection 162 extending toward the Z2 side formed on the Z2 side end surface of the first member 16, a tapered portion 164 whose diameter gradually decreases from the Z1 side toward the Z2 side is formed on the periphery of the end surface.

[0158] Thus, when the counterclockwise torque of the first gear 121 increases instantaneously as described above, the cantilever portion 142 of the rubber brake member 14 that attempts to fly outward in the radial direction under the action of the centrifugal force is stopped by the friction force FB and then returns to the radial direction inward. At this time, since the tapered portion 164 is formed in a conical shape whose diameter gradually converges toward the center from the Z1 side to the Z2 side, the tapered portion 164 can guide the cantilever portion 142 of the rubber brake member 14 to smoothly converge toward the radial direction inward without being caught.

[0159] Furthermore, in this embodiment, if Figure 7B As shown in FIG. 1 , the stopper wall 15B is formed integrally with the base 13. Therefore, the process of attaching the stopper wall 15B to the base 13 can be omitted.

[0160] (Variation 1 of the Second Embodiment)

[0161] In the second embodiment, the direction T1 of the torque applied from the rotor 113 to the first gear 121 is the same as the direction T2 of the torque applied from the external unidirectional load to the first gear 121 and is counterclockwise. In other words, the direction of the torque applied from the rotor 113 to the output shaft 128 and the direction of the torque applied from the external unidirectional load to the output shaft 128 are both clockwise. That is, the first direction is set to the counterclockwise direction and the second direction is set to the clockwise direction. In the above case, the rubber brake 14 is set to be S-shaped when viewed from the Z2 side to the Z1 side.

[0162] However, the present invention is not limited thereto, and may also be configured such that the direction T1 of the torque applied from the rotor 113 to the first gear 121 and the direction T2 of the torque applied from the external unidirectional load to the first gear 121 are both in the clockwise direction, in other words, the direction of the torque applied from the rotor 113 to the output shaft 128 and the direction of the torque applied from the external unidirectional load to the output shaft 128 are both in the counterclockwise direction. That is, the first direction is set to the clockwise direction, and the second direction is set to the counterclockwise direction. In the above case, the rubber brake 14 is set to be S-shaped when viewed from the Z1 side to the Z2 side, that is, the rubber brake 14 is turned upside down.

[0163] Thus, when the direction T1 of the torque applied to the first gear 121 by the rotor 113 is the same as the direction T2 of the torque applied to the first gear 121 by the external unidirectional load and both are in the clockwise direction, the extension 161 of the first gear member 16 rotates clockwise along with the first gear 121. Thus, a friction force in the counterclockwise direction is generated between the rubber brake 14 and the brake wall 15, and the friction force prevents the clockwise torque of the first gear 121 from increasing instantly, thereby preventing the meshing between the first gear 121 and the adjacent gear meshing therewith from being interrupted, and preventing the teeth from colliding with each other to generate vibration and noise.

[0164] According to the present modification 1, vibration reduction and noise reduction can be achieved in the same manner as in the above-mentioned second embodiment.

[0165] (Variation 2 of the Second Embodiment)

[0166] In the above-mentioned second embodiment, the extension portion 161 is formed on the surface on the Z2 side of the first component 16, but the present invention is not limited to this. The extension portion 161 can also be formed on the surface on the Z2 side of the small diameter portion 12112 of the first gear body portion 1211 of the first gear 121 as in the above-mentioned first embodiment.

[0167] According to the second modification, since the extension portion 161 is formed integrally with the first gear 121 , there is no need to separately provide a component for forming the extension portion 161 and a fixing component for fixing the component to the first gear, thereby reducing the number of components.

[0168] (Variation 3 of the Second Embodiment)

[0169] In the second embodiment, the brake wall 15B is integrally formed with the base 13, but the present invention is not limited thereto. The brake wall 15B and the base 13 may be separately formed and may be fixed to the base 13 by various fixing methods such as pressing, riveting, etc.

[0170] In addition, in the above-mentioned first embodiment and its variants 1 to 3, the second embodiment and its variants 1 to 3, as Fig.12 As shown, the front end portion of the cantilever portion 142 of the rubber brake member 14 is formed as a return hook portion 14331, and the inner diameter of the return hook portion 14331 is formed to prevent the front end portion 1611 or 12121 of the extension portion 1212 from escaping radially inward even when the extension portion 161 or 1212 is instantly reversed.

[0171] In addition, the length of the return hook portion 14331 is set so that the extension portion 1212 will not be hooked on the return hook portion 14331 even if it is reversed instantly.

[0172] In addition, although not shown in the figure, in the first embodiment and its modified examples 1-3, the second embodiment and its modified examples 1-3, the damping mechanism is provided between the first gear 121 and the base 13, and its height in the Z direction is lower than the height of the lower end surface of the second gear 123 meshing with the first gear 121. In this way, even if the damping mechanism is provided between the first gear 121 and the base 13, sufficient space can be saved, thereby preventing the device from being enlarged.

[0173] Above, in order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the embodiments of the present invention is clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0174] The first embodiment of the present invention and its variants 1-3, the second embodiment and its variants 1-3 have been described. However, in addition to the technical solutions described in the above-mentioned embodiments and their variants, the elements of the above-mentioned embodiments and their variants can also be combined to obtain the technical solution of the present invention without violating the inventive spirit of the present invention.

[0175] In the first embodiment, the second embodiment and their modifications, the damping mechanism is formed between the first gear and the base, but the present invention is not limited thereto, and the damping mechanism may be formed between another gear and the base.

[0176] In the first embodiment, the second embodiment and their modifications, the anti-reverse mounting groove is formed only in the cantilever portion 142 of the rubber stopper 14 , but the present invention is not limited thereto and the anti-reverse mounting groove may also be formed in the central portion 141 .

[0177] In the above-mentioned first embodiment, second embodiment and their modified examples, the protrusion and the protrusion are formed on the first gear side, and the limiting groove and the anti-reversal groove are formed on the rubber brake side, but the present invention is not limited to this. The limiting groove and the anti-reversal groove may be formed on the first gear side, and the protrusion and the protrusion are formed on the rubber brake side, or the limiting groove is formed on the first gear side, the protrusion is formed on the rubber brake side, the anti-reversal groove is formed on the rubber brake side, and the protrusion is formed on the first gear side, or the limiting groove is formed on the rubber brake side, the protrusion is formed on the first gear side, the anti-reversal groove is formed on the rubber brake side, and the protrusion is formed on the first gear side, or the limiting groove is formed on the rubber brake side, the protrusion is formed on the first gear side, the anti-reversal groove is formed on the first gear side, and the protrusion is formed on the rubber brake side.

[0178] In the first embodiment, the second embodiment and their modified examples, the brake member is made of rubber, but the present invention is not limited thereto and may be made of other elastic materials.

Claims

1. A vibration reduction and noise reduction structure for a motor, comprising: A rotor shaft, wherein the rotor shaft is fixed to the motor housing; A rotor, wherein the rotor is sleeved on the outer circumference of the rotor shaft and can rotate around the rotor shaft, and a rotor gear is arranged on the outer circumference of the upper portion; a transmission mechanism for transmitting the torque of the rotor to an external device; and A base, the base is used for mounting the transmission mechanism, It is characterized in that The transmission mechanism comprises at least a primary gear and a final gear, wherein the primary gear meshes with the rotor gear, and the final gear rotates integrally with the output shaft to output torque to an external device. A damping mechanism is provided in the structure for mounting the primary gear on the base, and the damping mechanism comprises: A first component, the first component can rotate synchronously with the primary gear coaxially, and includes a protruding portion extending toward the base side; a second component fixed to the base and formed into a cylindrical shape extending from the base toward the first component; a third component, the third component being formed of an elastic material, forming a stopper for accommodating the extension of the first component and limiting the rotation range of the extension, and being in elastic contact with the inner circumferential surface of the second component; and A primary gear shaft passes through the primary gear, the first component and the second component and is fixed to the base. The primary gear and the first component can rotate around the primary gear shaft.

2. The motor vibration reduction and noise reduction structure according to claim 1, characterized in that: The first component is formed separately from the primary gear and includes a cylindrical main body, and the extension portion extends from the main body toward the base.

3. The vibration reduction and noise reduction structure of the motor according to claim 1, characterized in that: The first component is formed integrally with the primary gear, The protruding portion extends from the primary gear toward the base side.

4. The motor vibration reduction and noise reduction structure according to claim 1, characterized in that: The second component is formed integrally with the base.

5. The motor vibration reduction and noise reduction structure according to claim 1, characterized in that: The second component is formed separately from the base.

6. The motor vibration reduction and noise reduction structure according to claim 1, characterized in that: The third component includes a cylindrical center portion and two roughly arc-shaped cantilever portions extending radially outward from the center portion and continuing to extend circumferentially, and the limiting portion is formed as a roughly arc-shaped limiting groove formed by the space between the outer circumferential surface of the center portion and the inner circumferential surface of the cantilever portion.

7. The motor vibration reduction and noise reduction structure according to claim 6, characterized in that: If the direction in which the rotor causes the primary gear to rotate and the direction in which the external unidirectional load causes the primary gear to rotate are both set as a first direction, and the direction opposite to the first direction is set as a second direction, a first limiting wall is formed at the front end portion of the limiting groove in the first direction to prevent the protruding portion from rotating in the first direction. A second limiting wall is formed on the radial outer side of the limiting groove to prevent the protruding portion from flying outward in the radial direction. A third limiting wall matching the shape of the front end portion of the extending portion in the second direction is formed at the front end portion of the limiting groove in the second direction.

8. The motor vibration reduction and noise reduction structure according to claim 7, characterized in that: The front end portion of the extension portion in the second direction is formed into a tapered shape that gradually becomes thinner as it goes toward the second direction. Correspondingly, the third limiting wall is formed into a front end thin shape which gradually becomes thinner toward the second direction.

9. The motor vibration reduction and noise reduction structure according to claim 8, characterized in that: The first direction is counterclockwise, and the second direction is clockwise.

10. The motor vibration reduction and noise reduction structure according to claim 8, characterized in that: The first direction is a clockwise direction, and the second direction is a counterclockwise direction.

11. The vibration reduction and noise reduction structure of a motor according to any one of claims 1 to 10, characterized in that: In addition to the protruding portion, the first component also includes a protrusion for preventing the third component from being inverted. Correspondingly, a groove for accommodating the protrusion is formed in the third component.

Images