Rotary vibration motor

Abstract

The utility model relates to the technical field of vibration motors, and discloses a rotary vibration motor, which comprises a shell, an end cover, a stator assembly, a rotor assembly and a fixed shaft, the shell and the end cover are buckled to form an accommodating space, the stator assembly, the rotor assembly and the fixed shaft are accommodated in the accommodating space, the stator assembly is fixed on the inner surface of the end cover, and the fixed shaft is fixed on the outer surface of the end cover. The rotor assembly sleeves the fixed shaft and rotates around the fixed shaft, the stator assembly comprises a coil, a flexible circuit board and a second magnet embedded in the coil, and the end cover comprises a circular second bottom wall and a groove which is concavely formed in the central position of the inner surface of the second bottom wall and is matched with the flexible circuit board in shape; the supporting part integrally and horizontally extends out of the accommodating space from the groove; the connecting line of the circle center of the second bottom wall and the center line of the supporting part is a central axis; the fixed shaft is fixed at the center of a circle; and a springback mechanism is arranged on the inner surface of the second bottom wall on the other side of the supporting part. The rotary vibration motor is novel in structure, more diversified vibration modes of the rotary vibration motor can be realized, and the vibration sense is stronger.

Description

Technical Field

[0001] The utility model relates to the technical field of vibration motors, in particular to a rotary vibration motor. Background Art

[0002] With the development of electronic technology, portable consumer electronic products have gradually occupied the global consumer market, such as mobile phones, handheld game consoles, multimedia entertainment equipment, etc. These electronic products generally use vibration motors for tactile feedback, such as incoming call notifications on mobile phones, vibration feedback on game consoles, etc. In order to meet such a wide range of applications, the vibration performance requirements of vibration motors are getting higher and higher.

[0003] Existing vibration motors usually include patch-type cylindrical vibration motors, in which the eccentric weight arranged on the rotating shaft realizes high-speed rotation under the driving force of the motor. However, the vibration mode of the patch-type cylindrical vibration motor is single, and the vibration experience obtained by customers is also relatively single. Therefore, it is necessary to provide a vibration motor with more diverse vibration modes and stronger vibration feeling. Utility Model Content

[0004] The purpose of the utility model is to provide a rotary vibration motor with more diverse vibration modes and stronger vibration sense, and its specific technical scheme is as follows:

[0005] A rotary vibration motor comprises a shell, an end cover, a stator assembly, a rotor assembly and a fixed shaft, wherein the shell and the end cover are buckled to form a containing space, wherein the stator assembly, the rotor assembly and the fixed shaft are contained in the containing space, wherein the stator assembly is fixed on the inner surface of the end cover, wherein the rotor assembly is sleeved on the fixed shaft and rotates around the fixed shaft, wherein the stator assembly comprises a coil, a flexible circuit board and a second magnet embedded in the coil, wherein the end cover comprises a circular second bottom wall, a groove which is recessed at the central position of the inner surface of the second bottom wall and matches the shape of the flexible circuit board, and a support portion which extends horizontally from the groove to the outside of the containing space; a line connecting the center of the second bottom wall and the center line of the support portion is a central axis; the fixed shaft is fixed at the center position; and a rebound mechanism is arranged on the inner surface of the second bottom wall on the other side of the support portion.

[0006] Preferably, there is one rebound mechanism and it is arranged on the central axis.

[0007] Preferably, the rebound mechanism comprises a fixing pin and a rebound ring fixedly sleeved on the fixing pin.

[0008] Preferably, the rebound ring is configured as a bellows.

[0009] Preferably, the end cover is adapted to be provided with a pin fixing groove corresponding to the fixing pin, and the pin fixing groove is located outside the groove.

[0010] Preferably, a shaft fixing portion for fixing the fixed shaft is protrudingly provided at the center position of the inner surface of the second bottom wall.

[0011] Preferably, the housing comprises a circular first bottom wall, and a positioning groove is recessed on an inner surface of the first bottom wall corresponding to the fixing pin.

[0012] Preferably, the rotor assembly includes a fan-shaped eccentric weight, a sliding bearing embedded in the center of the eccentric weight, and a first magnet symmetrically embedded in the eccentric weight.

[0013] Preferably, the first magnet and the second magnet are arranged in corresponding intervals up and down; the rotor assembly is sleeved on the fixed shaft through the sliding bearing and rotates around the fixed shaft.

[0014] Preferably, there are two rebound mechanisms, which are symmetrically arranged on both sides of the central axis.

[0015] Compared with the prior art, the utility model is not only novel in structure but also can realize more diversified vibration modes of the rotary vibration motor and provide a stronger vibration feeling. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural explosion diagram of the first embodiment of the utility model.

[0017] Figure 2 It is an axial cross-sectional view of the first embodiment of the utility model.

[0018] Figure 3 It is an assembled top view of the end cover, the rotor assembly and the rebound mechanism of the first embodiment of the utility model.

[0019] Figure 4 It is an assembled top view of the end cover, the rotor assembly and the rebound mechanism of the second embodiment of the utility model.

[0020] in:

[0021] 1-housing; 10-first bottom wall; 11-positioning groove;

[0022] 2-end cover; 20-second bottom wall; 200-groove; 21-shaft fixing portion; 22-pin fixing groove;

[0023] 3- rotor assembly; 30- eccentric weight; 31- first magnet; 32- sliding bearing;

[0024] 4-stator assembly; 40-flexible circuit board; 41-coil; 42-second magnet;

[0025] 5-Fixed axis;

[0026] 6- Gasket;

[0027] 7- Slide;

[0028] 8-rebound mechanism; 80-fixing pin; 81-rebound ring;

[0029] 9-Central axis. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] The structure of a rotary vibration motor (not shown) in the first embodiment of the utility model is as follows Figures 1 to 3 As shown, it includes a shell 1, an end cover 2, a rotor assembly 3, a stator assembly 4, a fixed shaft 5 and a rebound mechanism 8. The shell 1 is a hollow cylindrical structure with an open end. The shell 1 includes a circular first bottom wall 10 and a first side wall (not marked) vertically bent from the edge of the first bottom wall 10. The shell 1 and the end cover 2 are buckled to form an accommodating space (not marked). The rotor assembly 3, the stator assembly 4 and the fixed shaft 5 are accommodated in the accommodating space. The stator assembly 4 and the rebound mechanism 8 are fixed on the inner surface of the end cover 2. The fixed shaft 5 is fixed at the central position of the end cover 2. The rotor assembly 3 is sleeved on the fixed shaft 5 and rotates around it to ensure that the fixed shaft 5 firmly supports the rotation of the rotor assembly 3.

[0032] The stator assembly 4 includes a coil 41, a flexible circuit board 40 and a second magnet 42 embedded in the coil 41. The coil 41 is bonded and fixed on the flexible circuit board 40, and the second magnet 42 is embedded in the coil 41 and bonded and fixed. The axial thickness of the coil 41 is consistent with the axial thickness of the second magnet 42, so that the second magnet 410 can be completely embedded in the coil 41 without being wrapped by the coil 41, ensuring that the second magnet 42 can be magnetically attracted by the first magnet 31 of the rotor assembly 3.

[0033] The end cap 2 includes a circular second bottom wall 20, a groove 200 recessed at the center (not indicated) of the inner surface of the second bottom wall 20 and adapted to the shape of the flexible circuit board 40, and a support portion (not indicated) extending horizontally from the groove 200 to the outside of the accommodating space. The center of the second bottom wall 20 of the end cap 2 is formed by stamping and stretching to form a raised shaft fixing portion 21, and the fixed shaft 5 is fixed in the shaft fixing portion 21 to strengthen the stability of the fixed combination of the fixed shaft 5 and the end cap 2; the groove 200 is located outside the center of the circle, and the groove 200 is arranged outside the center of the circle. The setting of 00 is used to save the axial height of the accommodating space of the vibration motor, and the supporting part is used to support the flexible circuit board 40 to extend out of the accommodating space to connect an external power supply; the line connecting the center of the circle of the second bottom wall 20 and the center line of the supporting part is the central axis 9; the fixed shaft 5 is fixed at the center position; the stator assembly 4 is symmetrically fixed on the central axis of the second bottom wall 20 on one side of the supporting part, and a rebound mechanism 8 is symmetrically fixed on the central axis 9 of the second bottom wall 20 on the other side of the supporting part to optimize the balance of the vibration motor and ensure the vibration performance.

[0034] The rebound mechanism 8 includes a fixing pin 80 and a rebound ring 81 fixedly sleeved on the fixing pin 80. The rebound ring 81 is configured to be a bellows shape to increase the elasticity of the rebound mechanism 8. The second bottom wall 20 is adapted to be provided with a pin fixing groove 22 corresponding to the fixing pin 80. The pin fixing groove 22 is located outside the groove 200. The fixing pin 80 is fixed on the thicker second bottom wall 20, which is conducive to the stability of the rebound mechanism 8; preferably, the inner surface of the first bottom wall 10 is concavely provided with a positioning groove 11 corresponding to the fixing pin 80. When the shell 1 and the end cover 2 are buckled, the fixing pin 80 is limited and fixed between the shell 1 and the end cover 2, which is more conducive to the stability of the rebound mechanism 8; preferably, according to the mass of the rotor assembly 3, the rebound ring 81 can be widened to form an arc shape to shorten the vibration stroke of the rotor assembly 3, so that the swing of the eccentric weight 30 is close to simple harmonic motion, thereby increasing the vibration frequency of the rotor assembly 3, allowing the user to feel a very high-quality strong vibration.

[0035] The rotor assembly 3 includes a fan-shaped eccentric weight 30, a sliding bearing 32 embedded in the center (not indicated) of the eccentric weight 30, and a first magnet 31 symmetrically embedded in the eccentric weight 30. The axial thickness of the eccentric weight 30 is consistent with the axial thickness of the first magnet 31, so that the first magnet 31 can be completely embedded in the eccentric weight 30 without being wrapped by the eccentric weight 30, and the function of the first magnet 31 in the magnetic field is not affected; the rotor assembly 3 is sleeved on the fixed shaft 5 through the sliding bearing 32 and rotates around it. The sliding bearing 32 protrudes axially from the upper and lower surfaces of the eccentric weight 30 respectively to prevent the eccentric weight 30 from hitting the coil 41 below and the inner surface of the first bottom wall 10 above. At the same time, in order to prevent the sliding bearing 32 from abutting against the inner surface of the first bottom wall 10 and generating friction as the rotor assembly 3 rotates and damaging the first bottom wall 10, a sliding plate 7 is arranged between the first bottom wall 10 and the sliding bearing 32 to prevent damage to the housing assembly 1; in addition, a gasket 6 is arranged between the shaft fixing portion 21 and the sliding bearing 32 to limit the distance between the rotor assembly 3 and the stator assembly 4. Therefore, the vibration motor can adjust the thickness of the gasket 6 according to actual needs.

[0036] The first magnet 31 and the second magnet 42 of the rotary vibration motor of the utility model are arranged at corresponding intervals up and down, the axial projection area of ​​the first magnet 31 is larger than the area of ​​the second magnet 42, and the adjacent magnetic poles of the first magnet 31 and the second magnet 42 are opposite, so that the first magnet 31 and the second magnet 42 attract each other to ensure that the rotor assembly 3 is in the initial position; the first magnet 31 is made of a strong magnetic material, and is used to generate a force of mutual attraction and repulsion with the magnetic field generated by the coil 41 when it is energized; the second magnet 410 is a weak magnetic material, and is mainly used to be magnetically attracted by the first magnet 31; by energizing the coil 41 of the stator assembly 4 to generate a magnetic field and drive the rotor assembly 3 equipped with the first magnet 31 to rotate, the rotary vibration motor of the utility model adopts a square wave current, and in the process of switching the current, the magnetic field generated by the coil 41 when it is energized attracts and repels the first magnet 31 to rotate the rotor assembly 3; when the coil 41 of the rotary vibration motor is not energized, the first magnet 31 and the second magnet 2 with opposite magnetic poles attract each other to ensure that the rotor assembly 3 is in the initial position, and at this time the rotor assembly 3 symmetrically stops on the central axis 9 of the coil 41 and the second magnet 42.

[0037] The working principle of a rotary vibration motor of the utility model is as follows:

[0038] When the coil 41 is not energized, the N pole of the first magnet 31 attracts the S pole of the second magnet 42, and the rotor assembly 3 is positioned at the initial position on the central axis 9;

[0039] When the coil 41 is energized, the first magnet 31 at the initial position and the coil 41 form mutual repulsion, pushing the rotor assembly 3 to rotate; when the rotor assembly 3 touches one side of the rebound mechanism 8, the current direction of the coil 41 is switched, the first magnet 31 and the coil 41 form mutual attraction, and the elastic collision of the rebound mechanism 8 causes the rotor assembly 3 to rebound and rotate;

[0040] When the rotor assembly 3 rotates to the position of the central axis 9, the current direction of the coil 41 is switched, the first magnet 31 and the coil 41 form mutual repulsion, and continue to push the rotor assembly 3 to rotate. When the rotor assembly 3 touches the other side of the rebound mechanism 8; the current direction of the coil 41 is switched, the first magnet 31 and the coil 41 form mutual attraction, and the elastic collision between the rebound sheet 13 and the rebound mechanism 8 causes the rotor assembly 3 to rebound and rotate.

[0041] A rotary vibration motor of the utility model realizes the reciprocating swing of the rotor assembly 3 based on the above working principle. The eccentric weight 30 outputs a strong vibration sense as the rotor assembly 3 reciprocates, allowing the user to feel very high-quality vibration tactile feedback.

[0042] A rotary vibration motor (not shown) of the second embodiment of the utility model, in order to increase the vibration frequency, is based on the first embodiment and, according to the mass of the rotor assembly 3, is divided into two rebound mechanisms 8, which are symmetrically arranged on both sides of the central axis 9 to shorten the vibration stroke of the rotor assembly 3 and control the single pendulum angle of the rotor assembly 3 between 3° and 7°. Preferably, when the single pendulum angle is 5°, the swing of the eccentric weight 30 is close to simple harmonic motion, generating stronger vibration, thereby achieving a larger vibration amount of the rotor assembly 3.

[0043] It should be noted that, in the description of the present invention, the terms "up", "down", "front", "back", "left", "horizontal direction", "vertical direction" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0044] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A rotary vibration motor, comprising a housing, an end cover, a stator assembly, a rotor assembly and a fixed shaft, wherein the housing and the end cover are buckled to form a containing space, the stator assembly, the rotor assembly and the fixed shaft are contained in the containing space, the stator assembly is fixed on the inner surface of the end cover, the rotor assembly is sleeved on the fixed shaft and rotates around it, characterized in that: The stator assembly includes a coil, a flexible circuit board and a second magnet embedded in the coil; the end cover includes a circular second bottom wall, a groove recessed at a central position of an inner surface of the second bottom wall and adapted to the shape of the flexible circuit board, and a support portion extending horizontally from the groove to the outside of the accommodating space; a line connecting the center of the second bottom wall and the center line of the support portion is a central axis; the fixed shaft is fixed at the center position; a rebound mechanism is provided on the inner surface of the second bottom wall on the other side of the support portion.

2. The rotary vibration motor according to claim 1, characterized in that: The rebound mechanism is one and is arranged on the central axis.

3. The rotary vibration motor according to claim 2, characterized in that: The rebound mechanism comprises a fixing pin and a rebound ring fixedly sleeved on the fixing pin.

4. The rotary vibration motor according to claim 3, characterized in that: The rebound ring is configured in a bellows shape.

5. The rotary vibration motor according to claim 4, characterized in that: The end cover is adapted to be provided with a pin fixing groove corresponding to the fixing pin, and the pin fixing groove is located outside the groove.

6. The rotary vibration motor according to claim 5, characterized in that: A shaft fixing portion for fixing the fixed shaft is protruded at the center position of the inner surface of the second bottom wall.

7. The rotary vibration motor according to claim 6, characterized in that: The housing comprises a circular first bottom wall, and a positioning groove is recessed on the inner surface of the first bottom wall corresponding to the fixing pin.

8. The rotary vibration motor according to claim 7, characterized in that: The rotor assembly comprises a fan-shaped eccentric weight, a sliding bearing embedded in the center of the eccentric weight, and a first magnet symmetrically embedded in the eccentric weight.

9. The rotary vibration motor according to claim 8, characterized in that: The first magnet and the second magnet are arranged in a corresponding interval up and down; the rotor assembly is sleeved on the fixed shaft through the sliding bearing and rotates around the fixed shaft.

10. The rotary vibration motor according to claim 1, characterized in that: The number of the rebound mechanisms is two and they are symmetrically arranged on both sides of the central axis.

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