Vibration motor with accurate stroke

Abstract

The utility model discloses a vibration motor with an accurate stroke. The vibration motor comprises a shell, a rotating shaft, a bearing, a limiting frame, a magnetic conductive frame and a permanent magnet, the number of the permanent magnets is two, the permanent magnets are symmetrically arranged on the outer wall of the rotating shaft, the permanent magnets and part of the rotating shaft are arranged in a shell cavity of the shell, and the other part of the rotating shaft extends out of the shell; the rotating shaft is rotationally connected with the shell through the bearing; the limiting frame is arranged in the shell cavity, the limiting frame is provided with two sets of symmetrical limiting protrusions which are located between the two sets of symmetrical permanent magnets respectively, and the limiting protrusions are used for preventing the permanent magnets from passing through and / or rotating the rotating shaft when the permanent magnets rotate in the circumferential direction of the axis of the rotating shaft; the magnetic conductive frame is connected with the shell, and the magnetic conductive frame and the permanent magnet are arranged in a matched mode. A butt joint rotation stopping sliding groove is formed in the inner wall of the shell, and a sliding insertion guide rail corresponding to the butt joint rotation stopping sliding groove is arranged on the outer wall of the limiting frame.

Description

Technical Field

[0001] This application relates to the technical field of motor devices, and in particular, to a vibration motor with accurate stroke. Background Art

[0002] Some motors, such as the vibration motors applied to electric toothbrushes, can also be called sonic motors, which have the function of outputting high-speed vibrations. It is necessary to rely on a drive circuit to control the direction and frequency of the voltage finally input to the motor, so that the rotation direction of the motor can be changed, and it can rotate a very small angle, and perform a high-frequency reciprocating small stroke in the counterclockwise and clockwise directions. Specifically, a voltage with continuously changing polarities is applied to the coil, so that the cooperating rotating shaft undergoes high-frequency small-stroke forward and reverse swings. The frequency of the input voltage determines the swing frequency of the rotating shaft.

[0003] However, no matter how precise the drive circuit outputs the direction and frequency of the voltage to the motor, it is difficult to ensure absolute precision, and there will still be errors, which will cause the stroke amplitude of the rotating shaft to be too large or too small, and the expected stroke cannot be achieved. Coupled with the inertia of the rotating shaft itself, it is easier for the stroke amplitude of the rotating shaft to be too large, affecting the high-frequency output swing effect of the rotating shaft. Since the rotating shaft of the vibration motor only needs to perform small-stroke forward and reverse rotations, and there is no regular rotating body set as the stator like a traditional motor, the stator connected to the rotating shaft of the vibration motor is only a special-shaped stator / special-shaped magnet corresponding to the rotation amplitude approximately. When the stroke amplitude of the rotating shaft is too large and the special-shaped stator / special-shaped magnet rotates to the area without a magnet, the whole rotating shaft will take more time to reset, affecting the user experience. Summary of the Utility Model

[0004] The present utility model mainly aims at the above problems, and proposes a vibration motor with accurate stroke, aiming to solve the technical problems in the background art.

[0005] To achieve the above object, the present utility model provides a vibration motor with accurate stroke, including: a housing, a rotating shaft, a bearing, a limit frame, a magnetic conduction frame, and a permanent magnet; the number of the permanent magnets is two groups, symmetrically arranged on the outer wall of the rotating shaft, and the permanent magnets and a part of the rotating shaft are arranged in the cavity of the housing, and the other part of the rotating shaft extends out of the housing; the rotating shaft is rotationally connected to the housing through the bearing; the limit frame is arranged in the cavity, and the limit frame is provided with two groups of symmetric limit protrusions respectively located between the two groups of symmetric permanent magnets, and the limit protrusions are used to prevent the permanent magnets from passing through and / or the rotating shaft from rotating when the permanent magnets rotate circumferentially along the axis of the rotating shaft; the magnetic conduction frame is connected to the housing, and the magnetic conduction frame is arranged in cooperation with the layout of the permanent magnets.

[0006] Further, a docking anti-rotation sliding groove is provided on the inner wall of the housing, and a sliding insertion guide rail corresponding to the docking anti-rotation sliding groove is provided on the outer wall of the limit frame; a buckle hole is provided on the side wall of the housing, and a buckling protrusion matching the buckle hole is provided on the outer wall of the limit frame.

[0007] Further, the limit frame is provided with a plugging connecting rod, and the housing is provided with a plugging connection hole corresponding to the plugging connection of the plugging connecting rod.

[0008] Further, the bearing includes a first bearing and a second bearing; a fixing position for installing the first bearing is provided in the housing cavity, and a fixing position for connecting the second bearing is provided on the limit frame; both the first bearing and the second bearing are sleeved on the outer wall of the rotating shaft.

[0009] Further, the magnetic conduction frame is in a "П" shape and includes a cross arm, a first vertical arm, and a second vertical arm; the first vertical arm and the second vertical arm extend into the housing cavity and are arranged in cooperation with the layout of the permanent magnets; the cross arm is located outside the limit frame and has a gap with the limit frame.

[0010] Further, the housing is provided with avoidance grooves corresponding to the first vertical arm and the second vertical arm, and the limit frame is provided with clamping grooves for clamping the first vertical arm and the second vertical arm; the outer contour of the magnetic conduction frame is flush with the outer contour of the housing.

[0011] Further, it includes a rear cover and a driving coil, and the driving coil is wound around the cross arm; the rear cover is detachably connected to the outer end face of the limit frame; the rear cover encloses the driving coil and the cross arm; a wiring hole is provided on the end face of the rear cover.

[0012] Further, when one side of a group of permanent magnets abuts against a group of limit protrusions, the maximum angle of rotation of the other side of the group of permanent magnets to abut against another group of limit protrusions with the axis of the rotating shaft as the vertex is 30°.

[0013] The present application also provides a vibration motor with accurate stroke, including: a housing, a rotating shaft, a bearing, a magnetic conduction frame, and a permanent magnet; the number of permanent magnets is two groups, symmetrically arranged on the outer wall of the rotating shaft, and the permanent magnets and a part of the rotating shaft are arranged in the housing cavity of the housing, and the other part of the rotating shaft extends out of the housing; the rotating shaft is rotationally connected to the housing through the bearing; two groups of symmetric limit protrusions are provided on the inner wall of the housing cavity and are respectively located between the two groups of symmetric permanent magnets, and the limit protrusions are used to prevent the permanent magnets from passing through and / or the rotating shaft from rotating when the permanent magnets rotate circumferentially along the axis of the rotating shaft; the magnetic conduction frame is connected to the housing and is arranged in cooperation with the layout of the permanent magnets.

[0014] Further, when one side of a set of the permanent magnets abuts against a set of the limiting protrusions, with the axis of the rotating shaft as the vertex, the maximum rotation angle of the other side of this set of permanent magnets to abut against the other set of limiting protrusions is 30°.

[0015] Compared with the prior art, a vibration motor with accurate stroke provided by the present utility model can prevent the permanent magnets from passing when the limiting protrusions and the permanent magnets rotate circumferentially along the axis of the rotating shaft. Then, according to the forward and reverse rotation angle amplitudes of the rotating shaft and the permanent magnets, the relative positions of the limiting protrusions and the permanent magnets are correspondingly arranged, so as to prevent the rotation of the rotating shaft and the permanent magnets from exceeding the predetermined rotation angle from the level of the physical structure, which affects the high-frequency output swing effect of the rotating shaft, and avoids the errors in the direction and frequency of the voltage input to the motor by solely relying on the accuracy of the drive circuit in the prior art. When the permanent magnets rotate to a position not corresponding to the magnetic conduction frame, the overall rotating shaft will take more time to reset, affecting the user experience.

[0016] At the same time, due to the arrangement of the two sets of limiting protrusions, the permanent magnets are always located in the working area. Then, there is no need to set an additional reset mechanism in this vibration motor, which increases the space occupation and material manufacturing cost of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of a vibration motor with accurate stroke according to the present application.

[0018] Figure 2 It is an exploded schematic structural diagram of a vibration motor with accurate stroke according to the present application.

[0019] Figure 3 It is a further exploded schematic structural diagram of a vibration motor with accurate stroke according to the present application.

[0020] Figure 4 It is a cross-sectional view of a vibration motor with accurate stroke according to the present application.

[0021] Figure 5 It is a cross-sectional view of a vibration motor with accurate stroke according to the present application from another perspective.

[0022] Figure 6 It is a side view of the rotating shaft, the limiting frame, and the permanent magnets of a vibration motor with accurate stroke according to the present application.

[0023] Figure 7 It is a schematic structural diagram of the limiting frame of a vibration motor with accurate stroke according to the present application.

[0024] Figure 8 It is a schematic structural diagram of the rotating shaft and the permanent magnets of a vibration motor with accurate stroke according to the present application.

[0025] Figure 9Schematic diagram of the housing structure of a vibration motor with accurate stroke in this application.

[0026] Figure 10 Schematic diagram of the magnetic conduction frame structure of a vibration motor with accurate stroke in this application.

[0027] The reference numerals shown in the figure: 1. Housing; 110. Housing cavity; 120. Docking anti-rotation chute; 130. Plug-in connection hole; 140. Avoidance groove; 150. Clamping groove; 160. Buckling hole; 2. Rotating shaft; 310. First bearing; 320. Second bearing; 4. Limiting frame; 410. Limiting protrusion; 420. Sliding plug-in guide rail; 430. Plug-in connecting rod; 440. Clamping groove; 450. Concave hole; 460. Buckling protrusion; 5. Magnetic conduction frame; 510. Cross arm; 520. First vertical arm; 525. Step clamping part; 530. Second vertical arm; 6. Permanent magnet; 7. Fixed position; 8. Rear cover; 810. Wiring hole; 820. Threaded connection hole; 830. Convex rod; 10. Corner. Detailed implementation manners

[0028] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model. It can be understood that the accompanying drawings are only for reference and illustration, and are not used to limit the present utility model. The connection relationships shown in the drawings are only for clear description and do not limit the connection manners.

[0029] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component, or there may be an intermediate component at the same time. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present utility model belongs. It also should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations. The terms used in the description of the present utility model in this specification are only for the purpose of describing specific embodiments and are not intended to limit the present utility model.

[0030] It should also be noted that in the description of the present utility model, the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0031] Please refer to Figure 1 - Figure 10 In this embodiment, a vibration motor with accurate stroke is provided, including: a housing 1, a rotating shaft 2, a bearing, a limiting frame 4, a magnetic conductive frame 5, and a permanent magnet 6; the number of the permanent magnets 6 is two groups, symmetrically arranged on the outer wall of the rotating shaft 2, and the permanent magnets 6 and a part of the rotating shaft 2 are arranged in the housing cavity 110 of the housing 1, and the other part of the rotating shaft 2 extends out of the housing 1; the rotating shaft 2 is rotatably connected to the housing 1 through the bearing; the limiting frame 4 is arranged in the housing cavity 110, and the limiting frame 4 is provided with two groups of symmetric limiting protrusions 410 respectively located between the two groups of symmetric permanent magnets 6, and the limiting protrusions 410 are used to prevent the permanent magnets 6 from passing through and / or the rotating shaft 2 from rotating when the permanent magnets 6 rotate circumferentially along the axis of the rotating shaft 2; the magnetic conductive frame 5 is connected to the housing 1, and the magnetic conductive frame 5 and the permanent magnets 6 are arranged in a cooperative layout.

[0032] When the limiting protrusions 410 are used to prevent the permanent magnets 6 from passing through when the permanent magnets 6 rotate circumferentially along the axis of the rotating shaft 2, then according to the positive and negative rotation angle amplitudes of the rotating shaft 2 and the permanent magnets 6, the relative positions of the limiting protrusions 410 and the permanent magnets 6 are correspondingly arranged. From the level of the physical structure, the rotation of the rotating shaft 2 and the permanent magnets 6 beyond the predetermined rotation angle is blocked, so as to avoid affecting the high-frequency output swing effect of the rotating shaft 2. It also avoids the errors in the direction and frequency of the voltage input to the motor by relying solely on the accuracy of the drive circuit in the prior art. When the permanent magnets 6 rotate to a position not corresponding to the magnetic conductive frame 5, the whole rotating shaft 2 will take more time to reset, affecting the user experience.

[0033] At the same time, due to the arrangement of the two groups of limiting protrusions 410, the permanent magnets 6 are always located in the working area. Then, there is no need to set an additional reset mechanism in this vibration motor, which increases the space occupation and material manufacturing cost of the motor.

[0034] An embodiment in which the limiting protrusion 410 is used to prevent the rotation of the rotating shaft 2 when the permanent magnet 6 rotates circumferentially along the axis of the rotating shaft 2: The outer wall of the rotating shaft 2 may be provided with an anti-rotation protrusion (not shown), and the arrangement position of the anti-rotation protrusion may correspond to the position of the permanent magnet 6. Similarly, before the rotation of the rotating shaft 2 and the permanent magnet 6 exceeds a predetermined rotation angle, the anti-rotation protrusion abuts against the limiting protrusion 410 to prevent the rotation of the rotating shaft 2.

[0035] Preferably, the limiting protrusion 410 has an arc-shaped transition.

[0036] Please refer to Figure 7 and Figure 9 , a docking anti-rotation chute 120 is provided on the inner wall of the housing 1, and a sliding plug-in guide rail 420 corresponding to the docking anti-rotation chute 120 is provided on the outer wall of the limiting frame 4; a buckle hole 160 is provided on the side wall of the housing 1, and a buckling protrusion 460 matching the buckle hole 160 is provided on the outer wall of the limiting frame 4.

[0037] When the limiting frame 4 is docked and assembled with the housing 1, the sliding plug-in guide rail 420 is inserted into the docking anti-rotation chute 120 for alignment connection. The concave-convex structure of the two increases the contact area, so that the limiting frame 4 and the housing 1 are connected more firmly by friction. When the limiting frame 4 and the housing 1 are assembled in place, the buckling protrusion 460 is simultaneously snapped into the buckle hole 160 to improve the connection firmness between the limiting frame 4 and the housing 1. Preferably, the buckling protrusion 460 is provided with an inclined surface to avoid hindering the insertion of the sliding plug-in guide rail 420 into the docking anti-rotation chute 120. In some embodiments, the buckling protrusion 460 is provided on the end face of the sliding plug-in guide rail 420.

[0038] In addition, a step engaging portion 525 is provided at the ends of the first vertical arm 520 and the second vertical arm 530, and an engaging groove 150 corresponding to the step engaging portion 525 is provided in the housing 1, which can further enhance the connection locking force between the limiting frame 4 and the housing 1.

[0039] In some embodiments, the sliding plug-in guide rail 420 and the limiting protrusion 410 are arranged back to back.

[0040] Please refer to Figure 7 and Figure 9 , the limiting frame 4 is provided with a plug-in connecting rod 430, and the housing 1 is provided with a plug-in connection hole 130 corresponding to the plug-in connection of the plug-in connecting rod 430.

[0041] In some embodiments, the limiting frame 4 includes a collar portion and a vertical plate portion. The number of vertical plate portions is two and they are symmetrically arranged and connected to the end face of the collar portion; the concave hole 450, the threaded connection hole 820, and the fixed position 7 are all arranged on the collar portion; the limiting protrusion 410 and the sliding plug-in guide rail 420 are arranged back to back on the vertical plate portion.

[0042] The plug-in connecting rod 430 is provided in plurality, which is provided on the end surface of the collar portion and the end surface of the vertical plate portion.

[0043] Through this direct plug-in and pull-out, the plug-in connection structure of the plug-in connection rod 430 and the plug-in connection hole 130 relying on the friction force avoids the time-consuming disadvantage of using screws for assembly, and is also convenient for disassembly and maintenance.

[0044] Please refer to Figure 2 - Figure 5 The bearing includes a first bearing 310 and a second bearing 320; a fixing position 7 for installing the first bearing 310 is provided in the shell cavity 110, and the limiting frame 4 is provided with a fixing position 7 for connecting the second bearing 320; the first bearing 310 and the second bearing 320 are both sleeved and connected to the outer wall of the rotating shaft 2.

[0045] This structure avoids the problem of setting two fixing positions 7 for the housing 1 to fix two bearings respectively in the prior art. Because the housing 1 is generally a metal part, it is stamped and formed by a stamping die. When the housing 1 is provided with two fixing positions 7, the structure of the housing 1 will be more complicated and cannot be manufactured by a stamping die. It needs to be produced by machining with high cost and low production efficiency.

[0046] The present application sets one of the fixing positions 7 on the limit frame 4, which reduces the production cost on the one hand and facilitates the assembly of the vibration motor on the other hand, making it more convenient to install the bearing on the limit frame 4.

[0047] Since the permanent magnet 6 and the limiting protrusion 410 will impact and cause the limiting protrusion 410 component to wear, thanks to the structure of the aforementioned shell 1 and the limiting frame 4 that are easy to disassemble and assemble, when performing maintenance, it is only necessary to replace the injection molded limiting frame 4 with a lower cost after wear, without replacing the entire metal shell 1, so that the maintenance cost can be lowered, the maintenance is convenient and quick, and energy saving and emission reduction can be achieved.

[0048] Please refer to Figure 3 , Figure 4 and Figure 10 The magnetic conductive frame 5 is in a "П" shape, including a horizontal arm 510 and a first vertical arm 520 and a second vertical arm 530; the first vertical arm 520 and the second vertical arm 530 extend into the shell cavity 110 and are arranged in coordination with the permanent magnet 6; the horizontal arm 510 is located outside the limiting frame 4 and is spaced apart from the limiting frame 4.

[0049] In some embodiments, the magnetic conductive frame 5 can be formed by stacking multiple steel sheets or an integrally formed structure of metallurgical powder. The interval between the cross arm 510 and the limiting frame 4 is used to provide space for the arrangement of the driving coil (not shown).

[0050] This structure is easy to be manufactured by stamping in one time. The cutting tools of the corresponding stamping die are also easier to be manufactured compared with the magnetic conduction frames 5 of other structures, with low cost and easy maintenance.

[0051] Please refer to Figure 1 and Figure 2 、 Figure 9 ., the housing 1 is provided with avoidance grooves 140 corresponding to the first vertical arm 520 and the second vertical arm 530, and the limiting frame 4 is provided with clamping grooves 440 for clamping the first vertical arm 520 and the second vertical arm 530; the outer contour of the magnetic conduction frame 5 is flush with the outer contour of the housing 1.

[0052] By opening the avoidance grooves 140 in the housing 1, the first vertical arm 520 and the second vertical arm 530 are exposed from the housing 1 through the avoidance grooves 140, rather than the housing 1 surrounding the magnetic conduction frame 5 entirely inside the housing 1. This can enable the magnetic conduction frame 5 to have larger size specifications, high static magnetic torque and effective magnetic energy conversion rate. At the same time, the outer contour of the magnetic conduction frame 5 is flush with the outer contour of the housing 1, avoiding the first vertical arm 520 and the second vertical arm 530 protruding from the outer contour of the housing 1, so that products using this vibration motor do not need to be provided with additional irregular accommodation holes.

[0053] The magnetic conduction frame 5 is clamped and fixed by the avoidance grooves 140 and the clamping grooves 440, providing certain protection and limitation for the magnetic conduction frame 5, reducing the probability of deformation of the magnetic conduction frame 5, improving the structural strength, and also playing a sealing role to prevent the housing 1 from communicating with the outside world, resulting in water entering the housing cavity 110 when this vibration motor is applied to an electric toothbrush, causing failures.

[0054] Please refer to Figure 1 - Figure 4 ., including a rear cover 8 and a driving coil (not shown), the driving coil is wound around the cross arm 510; the rear cover 8 is detachably connected to the outer end face of the limiting frame 4; the rear cover 8 encloses the driving coil and the cross arm 510, playing a protective role for the driving coil to prevent water from entering the driving coil and causing failures; the end face of the rear cover 8 is provided with a wiring hole 810 for connecting a wire to the driving coil.

[0055] In some embodiments, the rear cover 8 is detachably connected to the outer end face of the limiting frame 4. The adopted method is a butt - plug structure of a set of correspondingly - connected threaded connection holes 820 and a set of convex rods 830 and concave holes 450 arranged diagonally. After the butt - plug structure of the convex rods 830 and the concave holes 450 is used for preliminary connection, long screws (not shown) are used to connect the threaded connection holes 820 to firmly connect the rear cover 8 and the limiting frame 4.

[0056] The rear cover 8 is also provided with avoidance grooves 140 corresponding to the magnetic conduction frame 5.

[0057] Please refer to Figure 6When one side of a group of the permanent magnets 6 abuts against a group of the limiting protrusions 410, with the axis of the rotating shaft 2 as the vertex, the maximum rotation angle of the other side of this group of the permanent magnets 6 to abut against the other group of the limiting protrusions 410 is 30°.

[0058] Embodiment 2 (not shown)

[0059] A vibration motor with precise stroke includes: a housing, a rotating shaft, bearings, a magnetic conductive frame, and permanent magnets; the number of the permanent magnets is two groups, symmetrically arranged on the outer wall of the rotating shaft, and the permanent magnets and a part of the rotating shaft are arranged in the housing cavity of the housing, and the other part of the rotating shaft extends out of the housing; the rotating shaft is rotatably connected to the housing through the bearings; two groups of symmetric limiting protrusions are arranged on the inner wall of the housing cavity and are respectively located between the two groups of symmetric permanent magnets, and the limiting protrusions are used to prevent the permanent magnets from passing through and / or the rotating shaft from rotating when the permanent magnets rotate circumferentially along the axis of the rotating shaft; the magnetic conductive frame is connected to the housing and is arranged in cooperation with the layout of the permanent magnets.

[0060] When one side of a group of the permanent magnets abuts against a group of the limiting protrusions, with the axis of the rotating shaft as the vertex, the maximum rotation angle of the other side of this group of the permanent magnets to abut against the other group of the limiting protrusions is 30°.

[0061] In this Embodiment 2, compared with Embodiment 1, the limiting frame 4 is cancelled, and the limiting protrusions 410 in the limiting frame 4 are directly arranged on the inner wall of the housing cavity. At the same time, the number of bearings in this embodiment is two, and the housing is provided with two fixing positions to fix the two bearings respectively. This structure can be realized by the prior art and will not be elaborated here.

[0062] Embodiment 2 also has the relevant characteristics and advantages in Embodiment 1: when the limiting protrusions are used to prevent the permanent magnets from passing through when the permanent magnets rotate circumferentially along the axis of the rotating shaft, then according to the positive and negative rotation angle amplitudes of the rotating shaft and the permanent magnets, the relative positions of the limiting protrusions and the permanent magnets are correspondingly arranged, so as to prevent the rotation of the rotating shaft and the permanent magnets from exceeding the predetermined rotation angle from the level of the physical structure, which affects the high-frequency output swing effect of the rotating shaft, and avoids the errors in the direction and frequency of the voltage input to the motor by relying solely on the accuracy of the drive circuit in the prior art. When the permanent magnets rotate to a position not corresponding to the magnetic conductive frame, the whole rotating shaft will take more time to reset, affecting the user experience.

[0063] At the same time, due to the arrangement of the two groups of limiting protrusions, the permanent magnets are always located in the working area, so there is no need to set an additional reset mechanism in this vibration motor to increase the space occupation and material manufacturing cost of the motor.

[0064] In the description and claims of the present application, the words "comprising" and "including" and their variants are used to specify the presence of stated features, values, steps or components, but do not preclude the presence or addition of one or more other features, values, steps, components or combinations thereof.

[0065] Some features of the present utility model are described separately in different embodiments for clarity. However, these features can also be described in combination in a single embodiment. Conversely, some features of the present utility model are described only in a single embodiment for brevity. However, these features can also be described separately or in any suitable combination in different embodiments.

[0066] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A vibration motor with precise stroke, characterized in that, Comprising: A housing, a rotating shaft, bearings, a limiting frame, a magnetic conduction frame, and permanent magnets; the number of the permanent magnets is two groups, symmetrically arranged on the outer wall of the rotating shaft, and the permanent magnets and part of the rotating shaft are arranged in the housing cavity of the housing, and the other part of the rotating shaft extends out of the housing; the rotating shaft is rotatably connected to the housing through the bearings; the limiting frame is arranged in the housing cavity, and the limiting frame is provided with two groups of symmetric limiting protrusions respectively located between the two groups of symmetric permanent magnets, and the limiting protrusions are used to prevent the permanent magnets from passing through and / or the rotating shaft from rotating when the permanent magnets rotate circumferentially along the axis of the rotating shaft; the magnetic conduction frame is connected to the housing, and the magnetic conduction frame and the permanent magnets are arranged in a cooperative layout.

2. The vibration motor with accurate stroke according to claim 1, characterized in that, The inner wall of the housing is provided with a docking anti-rotation chute, and the outer wall of the limiting frame is provided with a sliding insertion guide rail corresponding to the docking anti-rotation chute; the side wall of the housing is provided with a buckling hole, and the outer wall of the limiting frame is provided with a buckling protrusion matching the buckling hole.

3. A vibration motor with accurate stroke according to claim 1, characterized in that, The limiting frame is provided with an insertion connecting rod, and the housing is provided with an insertion connection hole corresponding to the insertion connection of the insertion connecting rod.

4. A vibration motor with accurate stroke according to claim 1, characterized in that, The bearings include a first bearing and a second bearing; a fixing position for installing the first bearing is arranged in the housing cavity, and a fixing position for connecting the second bearing is arranged on the limiting frame; both the first bearing and the second bearing are sleeved on the outer wall of the rotating shaft.

5. A vibration motor with accurate stroke according to claim 1, characterized in that, The magnetic conduction frame is in a "П" shape, including a cross arm, a first vertical arm, and a second vertical arm; the first vertical arm and the second vertical arm extend into the housing cavity and are arranged in a cooperative layout with the permanent magnets; the cross arm is located outside the limiting frame and has a gap with the limiting frame.

6. The vibration motor with accurate stroke according to claim 5, characterized in that, The housing is provided with avoidance grooves corresponding to the first vertical arm and the second vertical arm, and the limiting frame is provided with clamping grooves for clamping the first vertical arm and the second vertical arm; the outer contour of the magnetic conduction frame is flush with the outer contour of the housing.

7. The vibration motor with accurate stroke according to claim 5, characterized in that, Comprising a rear cover and a driving coil, the driving coil is wound around the cross arm; the rear cover is detachably connected to the outer end face of the limiting frame; the rear cover encloses the driving coil and the cross arm; the end face of the rear cover is provided with a wiring hole.

8. A vibration motor with precise stroke according to claim 1, characterized in that, When one side of a group of permanent magnets abuts against a group of limiting protrusions, the maximum rotation angle of the other side of the group of permanent magnets to abut against the other group of limiting protrusions with the axis of the rotating shaft as the vertex is 30°.

9. A vibration motor with accurate stroke, characterized in that, Comprising: A housing, a rotating shaft, bearings, a magnetic conduction frame, and permanent magnets; the number of the permanent magnets is two groups, symmetrically arranged on the outer wall of the rotating shaft, and the permanent magnets and part of the rotating shaft are arranged in the housing cavity of the housing, and the other part of the rotating shaft extends out of the housing; the rotating shaft is rotatably connected to the housing through the bearings; two groups of symmetric limiting protrusions are arranged on the inner wall of the housing cavity respectively located between the two groups of symmetric permanent magnets, and the limiting protrusions are used to prevent the permanent magnets from passing through and / or the rotating shaft from rotating when the permanent magnets rotate circumferentially along the axis of the rotating shaft; the magnetic conduction frame is connected to the housing and arranged in a cooperative layout with the permanent magnets.

10. A vibration motor with precise stroke according to claim 9, characterized in that, When one side of a group of permanent magnets abuts against a group of limiting protrusions, the maximum rotation angle of the other side of the group of permanent magnets to abut against the other group of limiting protrusions with the axis of the rotating shaft as the vertex is 30°.

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