Vibration motor

Abstract

The utility model relates to the technical field of vibration motors, and discloses a vibration motor, which comprises a shell assembly with an opening at one end, a plate-shaped cover body, a stator assembly, a rotor assembly, a fixed shaft and a springback mechanism, the fixed shaft is fixed on the cover body, the rotor assembly is sleeved on the fixed shaft and rotates around the fixed shaft, the shell assembly and the cover body are matched and buckled to form an accommodating space, and the springback mechanism is arranged in the accommodating space. The stator assembly, the rotor assembly, the fixing shaft and the springback mechanism are accommodated in the accommodating space, the stator assembly comprises two coils and a flexible circuit board, the shell assembly comprises a bottom wall, a side wall and damping parts attached to the inner surfaces of the four corners of the side wall, and the springback mechanism comprises a torsional spring part, a connecting arm, a first fixing part, a second fixing part and a limiting piece; the torsional spring part is sleeved on the fixed shaft, the torsional spring part and the connecting arm are limited in the rotor assembly, and the first fixed part is fixedly connected with the second fixed part. The vibration motor is novel in structure, more diversified vibration modes of the 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, and particularly relates to a 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 devices, etc. These electronic products generally use vibration motors for tactile feedback, such as incoming call prompts on mobile phones and vibration feedback on game consoles. To meet such a wide range of applications, the requirements for the vibration performance of vibration motors are getting higher and higher.

[0003] Existing vibration motors usually have surface-mounted columnar vibration motors. The eccentric hammer arranged on the rotating shaft rotates at high speed under the driving force of the motor. However, the vibration mode of the surface-mounted columnar vibration motor is single, and the vibration feeling 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. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a vibration motor with more diverse vibration modes and stronger vibration feeling. The specific technical solution is as follows:

[0005] A vibration motor includes a housing assembly with an open end, a plate-shaped cover, a stator assembly, a rotor assembly, a fixed shaft, and a spring-back mechanism. The fixed shaft is fixed on the cover. The rotor assembly is sleeved on the fixed shaft and rotates around it. The housing assembly and the cover are fitted and buckled to form an accommodation space. The stator assembly, the rotor assembly, the fixed shaft, and the spring-back mechanism are accommodated in the accommodation space. The stator assembly includes two coils and a flexible circuit board. The housing assembly includes a rectangular bottom wall, side walls, and damping members mounted on the inner surfaces of the four corners of the side walls. The spring-back mechanism includes a torsion spring part, connecting arms extending parallel from the free ends on both axial sides of the torsion spring part, a first fixing part extending perpendicularly and in the same direction from the free ends of the connecting arms, a second fixing part provided on the bottom wall or the cover corresponding to the first fixing part, and a limiting piece arranged between the torsion spring part and the stator assembly. The torsion spring part is sleeved on the fixed shaft. The torsion spring part and the connecting arms are limited in the rotor assembly. The first fixing part is connected and fixed to the second fixing part.

[0006] Preferably, the axial projections of the connecting arms on both sides of the torsion spring part are on the same straight line.

[0007] Preferably, the rotor assembly includes a cuboid mass block, a permanent magnet embedded in the mass block, and a sliding bearing; the mass block includes a first through hole penetrating its axial thickness, second through holes symmetrically located on both sides of the first through hole, and a blind groove communicating with the first through hole and obliquely penetrating the lower surface of the mass block in the width direction of the mass block; the sliding bearing is fixed in the first through hole and sleeved on the fixed shaft, the rotor assembly rotates around the fixed shaft between the sliding bearings, the torsion spring portion is limited in the first through hole and is axially arranged above and below the sliding bearing, the connecting arm is fitted in the blind groove, the blind groove is located between the second through holes, and the axial depth of the blind groove is adapted to the height of the connecting arm.

[0008] Preferably, a shaft fixing portion protrudes from the central position of the inner surface of the cover body, the limiting piece is arranged between the shaft fixing portion and the rotor assembly, the limiting piece is sleeved on the fixed shaft, and the area of the limiting piece is larger than the cross-sectional area of the first through hole.

[0009] Preferably, the flexible circuit board is fixedly attached to the inner surface of the cover body, and the coils are fixed to the inner surfaces at two diagonal positions of the side wall and are arranged corresponding to the permanent magnets.

[0010] Preferably, a limiting portion for limiting the fixed shaft protrudes from the central position of the inner surface of the bottom wall, a sliding piece is arranged between the limiting portion and the fixed shaft, and the area of the sliding piece is larger than the cross-sectional areas of the limiting portion and the sliding bearing.

[0011] Preferably, the damping piece is arranged on the same side as the coil, and the coil is located between the damping pieces.

[0012] Preferably, the second fixing portion is located between the two long side surfaces of the rotor assembly and the side wall and on the horizontal extension line of the blind groove; the second fixing portion is located away from the coil on the same side as it.

[0013] Preferably, the second fixing portion is an annular fixing groove protruding from the inner surface of the bottom wall or the cover body.

[0014] Preferably, the second fixing portion is a through hole penetrating the bottom wall or the cover body.

[0015] Compared with the prior art, the utility model not only has a novel structure but also can realize more diverse vibration modes of the vibration motor, and the setting of the rebound mechanism makes the vibration feeling of the vibration motor stronger. Description of the Drawings

[0016] Figure 1 It is an exploded view of the structure of the vibration motor of the first embodiment.

[0017] Figure 2It is an assembly schematic diagram of the resilience mechanism, rotor assembly and housing assembly of the first embodiment.

[0018] Figure 3 It is a schematic diagram of the mass block structure of the first embodiment.

[0019] Figure 4 It is a schematic diagram of the structure of the torsion spring part, connecting arm and first fixing part of the first embodiment.

[0020] Figure 5 It is a cross-sectional view of the assembly structure of the vibration motor of the first embodiment.

[0021] Figure 6 It is a bottom view of the housing assembly of the first embodiment.

[0022] Figure 7 It is a bottom view of the housing assembly of the third embodiment.

[0023] Figure 8 It is a three-dimensional assembly diagram of the vibration motor of the third embodiment.

[0024] Among them:

[0025] 1 - Housing assembly; 10 - Bottom wall; 11 - Side wall; 12 - Limiting part; 13 - Damping sheet;

[0026] 2 - Cover body; 20 - Shaft fixing part;

[0027] 3 - Stator assembly; 30 - Flexible circuit board; 31 - Coil;

[0028] 4 - Rotor assembly; 40 - Mass block; 41 - Permanent magnet; 42 - Sliding bearing;

[0029] 400 - First through hole; 401 - Second through hole; 402 - Blind groove;

[0030] 5 - Fixed shaft;

[0031] 6 - Slide piece;

[0032] 7 - Resilience mechanism; 70 - Torsion spring part; 71 - Connecting arm; 72 - First fixing part; 73 - Second fixing part; 74 - Limiting piece. Specific embodiments

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0034] The structure of a vibration motor according to the first embodiment of the present utility model is as follows Figures 1 to 6 shown, which includes a housing assembly 1 with an open end, a plate-shaped cover 2, a stator assembly 3, a rotor assembly 4, a fixed shaft 5, and a spring-back mechanism 7. The housing assembly 1 and the cover 2 are fitted and fastened to form a receiving space, and the stator assembly 3, the rotor assembly 4, the fixed shaft 5, and the spring-back mechanism 7 are received in the receiving space. Among them, the housing assembly 1 includes a rectangular bottom wall 10, side walls 11 vertically bent from the four sides of the bottom wall 10, and damping members 13 mounted on the inner surfaces of the four corners of the side walls 11 on the long sides of the housing assembly 1; the stator assembly 3 includes a flexible circuit board 30 and two coils 31 electrically connected to the flexible circuit board 30. The flexible circuit board 30 is fixedly attached to the inner surface of the cover 2, and the coils 31 are respectively fixedly attached to the inner surfaces at the diagonal positions of the side walls 11 on the long sides of the housing assembly 1. The damping sheet 13 is arranged on the same side as the coils 31, and the coils 31 are located between the damping sheets 13 and correspond to the four corners of the rotor assembly 4; the fixed shaft 5 is fixed on the cover 2. Preferably, a shaft fixing portion 20 protrudes from the central position of the inner surface of the cover 2 to enhance the fixing strength of the fixed shaft 5; the rotor assembly 4 is sleeved on the fixed shaft 5 and rotates around it; among them, in the present utility model, the side facing the housing assembly 1 is set as the upper side of the vibration motor, and the side facing the cover 2 is the lower side of the vibration motor.

[0035] The spring-back mechanism 7 includes a torsion spring portion 70, connecting arms 71 extending parallel from the free ends on both axial sides of the torsion spring portion 70, first fixing portions 72 extending perpendicularly and in the same direction from the free ends of the connecting arms 71, second fixing portions 73 provided on the bottom wall 10 corresponding to the first fixing portions 72, and a limiting piece 74 provided between the torsion spring portion 70 and the stator assembly 3. Specifically, the limiting piece 74 is located between the flexible circuit board 30 and the lower surface of the rotor assembly 4. Among them, the torsion spring portion 70 is sleeved on the fixed shaft 5, the torsion spring portion 70 and the connecting arms 71 are limited within the rotor assembly 4, and the first fixing portion 72 is connected and fixed to the second fixing portion 73 to realize the static fixation of the ends of the connecting arms 71 on the bottom wall 10. The setting of the first fixing portion 72 realizes the lengthening of the length of the connecting arms 71. Preferably, the connecting arms 71 on both sides of the torsion spring portion 70 are in the same straight line in their axial projection, which can make the connecting arms 71 generate a greater torque, so that the torsion spring portion 70 generates a greater deformation during the rotation of the rotor assembly 4 to release a greater spring-back force, and the spring-back mechanism 7 fully exerts the holding and restoring functions of placing the rotor assembly 4 in the initial position.

[0036] The rotor assembly 4 includes a cuboid mass block 40, a permanent magnet 41 embedded in the mass block 40, and a sliding bearing 42. Among them, the mass block 40 includes a first through hole 400 penetrating its axial thickness, second through holes 401 symmetrically located on both sides of the first through hole 400, and blind slots 402 communicating with the first through holes 401 and obliquely penetrating its lower surface in the width direction of the mass block; the sliding bearing 42 is fixed in the first through hole 400 and sleeved on the fixed shaft 5. The rotor assembly 4 rotates around the fixed shaft 5 between the sliding bearings 42. Among them, coils 31 fixed at two diagonal positions on the side wall 11 are arranged corresponding to the permanent magnet 41, so that when the coils 31 are energized, a magnetic field is generated to attract and repel the magnet 41, thereby driving the rotor assembly 4 to rotate around the fixed shaft 5. The damping members 13 are correspondingly located at the four corners of the mass block 40 to prevent the four corners of the mass block 40 from directly hitting the side wall 11 during the rotation of the rotor assembly 4, avoiding the generation of noise. At the same time, it prevents the housing assembly 1 from being deformed due to impact, thereby ensuring the vibration performance of the vibration motor; the torsion spring portion 70 is limited in the first through hole 400 and is axially arranged above and below the sliding bearing 42 to save the axial space of the vibration motor. The connecting arm 71 is adaptively embedded in the obliquely arranged blind slot 402 to make full use of the effective internal space of the vibration motor, and the length of the connecting arm 71 can be extended. When the connecting arm 71 receives the same torsion force, a greater torque will be generated. The blind slot 402 is located between the second through holes 401, and the axial depth of the blind slot 401 is adapted to the height of the connecting arm 71. The limiting piece 74 is arranged between the shaft fixing portion 20 and the rotor assembly 4. The limiting piece 74 is sleeved on the fixed shaft 5. Specifically, the limiting piece 74 is located between the flexible circuit board 30 and the lower surface of the mass block 40. The area of the limiting piece 74 is larger than the cross-sectional area of the first through hole 400. The arrangement of the limiting piece 74 can not only adjust the axial height of the rotor assembly 4, but also axially limit the torsion spring portion 70 in the first through hole 400. When the connecting arm 71 receives the torsion force given by the rotation of the rotor assembly 4, the torsion spring portion 70 can generate stable deformation and reaction force, ensuring that the return spring mechanism 7 provides a more stable return force for the reset of the rotor assembly 4. The second fixing portion 73 is located between the long side surfaces of both sides of the rotor assembly 4 and the side wall 11 and on the horizontal extension line of the blind slot 402 to ensure that the connecting arm 71 can be kept in a straight line. When the first fixing portion 72 and the second fixing portion 73 are adapted and welded and fixed, the static fixing of the end of the connecting arm 71 on the housing assembly 1 is realized, ensuring that the rotor assembly 4 can return to the initial position more stably, thereby optimizing the vibration performance of the vibration motor. Preferably, the second fixing portion 73 is located away from the coil 31 on the same side as it to effectively utilize the internal accommodation space of the vibration motor in its width direction.

[0037] At the central position on the inner surface of the bottom wall 10 of the housing assembly 1, a limiting portion 12 of the limiting fixed shaft 5 is protrudingly provided. A sliding piece 6 is provided between the limiting portion 12 and the fixed shaft 5. The sliding bearing 42 protrudes from the upper surface of the mass block 40 toward the bottom wall 10, preventing friction between the mass block 40 and the housing assembly 1 during the rotation of the rotor assembly 4, avoiding the generation of noise and affecting the vibration performance of the vibration motor. The area of the sliding piece 6 is larger than the cross-sectional areas of the limiting portion 12 and the sliding bearing 42, preventing direct friction between the sliding bearing 42 and the limiting portion 12 during the rotation of the rotor assembly 4, reducing noise, preventing deformation of the housing assembly 1 due to friction. The setting of the sliding piece 6 can ensure that the rotation of the rotor assembly 4 is smoother, thereby optimizing the vibration performance of the vibration motor.

[0038] Based on the first embodiment, in a vibration motor (not shown) of the second embodiment of the present invention, a second fixing portion 73 is protrudingly provided on the cover body 2 corresponding to the position of the first fixing portion 72, and the first fixing portion 72 and the second fixing portion 73 are adapted and welded to fix, so as to realize the static fixing of the end of the connecting arm 71 on the cover body 2.

[0039] The structure of a vibration motor according to the third embodiment of the present invention is as Figure 7 and Figure 8 shown. Based on the first and second embodiments, the second fixing portion 73 is directly set as a through hole 83 penetrating the bottom wall 10 or the cover body 2.

[0040] The working principle of a vibration motor of the present invention is as follows:

[0041] The vibration motor adopts a square-wave current. During the process of switching the current of the given sub-component 3, the magnetic field generated by the energized coil 31 attracts and repels the magnet 41, causing the rotor assembly 4 to rotate reciprocally to output a vibration sensation. The resilient mechanism 7, with one end fixed to the housing assembly 1 and the other end limited to the rotor assembly 4, is used to maintain the initial position of the rotor assembly 4 in the accommodation space when the stator assembly 3 is de-energized, and to provide a resilient force for the rotor assembly 4 to return to the initial position after the stator assembly 3 is powered off. Among them, the resilient mechanism 7 is adaptively limited in the first through hole 400 of the rotor assembly 4 through its torsion spring portion 70 and is sleeved on the fixed shaft 5 together with the rotor assembly 4. The connecting arm 71 is adapted to the blind slot 402 of the rotor assembly 4, and the first fixing portion 72 is fixedly connected to the second fixing portion 73 on the bottom wall 10 or the cover body 2. When the coil 31 is not energized, the torsion spring portion 70 is in the original undeformed state, and the resilient mechanism 7 holds the rotor assembly 4 in the initial position in the accommodation space through its connecting arm 71. Specifically, when the coil 31 is energized, the rotor assembly 4 rotates reciprocally in the accommodation space, and the connecting arm 71 adapted to the blind slot of the rotor assembly 4 rotates reciprocally with the rotor assembly 4, resulting in the torsion spring portion 70 being subjected to clockwise and counterclockwise torques by the reciprocating rotation of the connecting arm 71 in the first through hole 400, and the torsion spring portion 70 thus generating positive and negative deformations. When the current of the coil 31 is commutated, the rotor assembly 4 rotates in the reverse direction, driving the connecting arm 71 of the resilient mechanism 7 to deform in the reverse direction, so that the positive deformation energy accumulated by the torsion spring portion 70 can drive the rotor assembly 4 to quickly rotate back, thereby outputting a stronger vibration sensation. When the coil 31 is powered off, the rotor assembly 4 stops rotating, causing the external force deforming the torsion spring portion 70 to disappear, and the torsion spring portion 70 restores its original state due to its own property, thereby driving the connecting arm 71 to restore the rotor assembly 4 to the initial position in the accommodation space.

[0042] The assembly process of a vibration motor of the present utility model is as follows:

[0043] First, the damping member 13 is mounted on the inner surfaces of the four corners of the long-side side wall 11 of the housing assembly 1, and the two coils 31 of the stator assembly 3 are respectively fixed between the damping members 13 at two diagonals of the long-side side wall 11 of the housing assembly 1 and on the same side of the side wall 11.

[0044] Second, the flexible circuit board 30 of the stator assembly 3 is mounted on the inner surface of the cover body 2, and the fixed shaft 5 is fixed on the cover body 2.

[0045] Third, the rotor assembly 4 is sleeved on the fixed shaft 5, and the torsion spring portion 70 and the limiting piece 74 of the resilient mechanism 7 are successively sleeved on the fixed shaft 5.

[0046] Finally, the housing assembly 1 and the cover body 2 are buckled, and the first fixing portion 72 and the second fixing portion 73 of the resilient mechanism 7 are adapted and welded and fixed.

[0047] It should be noted that in the description of the present utility model, the orientation or positional relationship indicated by terms such as "upper", "lower", "front", "rear", "left", "horizontal direction", "vertical direction", 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 component 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.

[0048] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A vibration motor, comprising a housing assembly with an opening at one end, a plate-shaped cover, a stator assembly, a rotor assembly, a fixed shaft and a rebound mechanism, wherein the fixed shaft is fixed on the cover, the rotor assembly is sleeved on the fixed shaft and rotates around the fixed shaft, the housing assembly and the cover are adapted to buckle to form an accommodating space, characterized in that: The stator assembly, the rotor assembly, the fixed shaft and the rebound mechanism are accommodated in the accommodating space, the stator assembly includes two coils and a flexible circuit board, the shell assembly includes a rectangular bottom wall, a side wall and damping plates mounted on the inner surfaces of the four corners of the side wall, the rebound mechanism includes a torsion spring part, a connecting arm extending in parallel from the free ends on both sides of the axis of the torsion spring part, a first fixing part extending from the free end of the connecting arm by vertical bending in the same direction, a second fixing part corresponding to the first fixing part and arranged on the bottom wall or the cover body, and a limiting plate arranged between the torsion spring part and the stator assembly; the torsion spring part is sleeved on the fixed shaft, the torsion spring part and the connecting arm are limited in the rotor assembly, and the first fixing part is connected and fixed to the second fixing part.

2. The vibration motor according to claim 1, characterized in that: The axial projections of the connecting arms on both sides of the torsion spring portion are on the same straight line.

3. The vibration motor according to claim 2, characterized in that: The rotor assembly includes a rectangular mass block, a permanent magnet and a sliding bearing embedded in the mass block; the mass block includes a first through hole that runs through its axial thickness, second through holes symmetrically located on both sides of the first through hole, and a blind groove that is connected to the first through hole and runs through its lower surface obliquely in the width direction of the mass block; the sliding bearing is fixed in the first through hole and sleeved on the fixed shaft, the rotor assembly rotates around the fixed shaft between the sliding bearing, the torsion spring portion is limited to be located in the first through hole and is axially arranged up and down with the sliding bearing, the connecting arm is adapted to be embedded in the blind groove, the blind groove is located between the second through holes, and the axial depth of the blind groove is adapted to the height of the connecting arm.

4. The vibration motor according to claim 3, characterized in that: An axis fixing portion is protruded from the central position of the inner surface of the cover body, the limiting piece is arranged between the axis fixing portion and the rotor assembly, the limiting piece is sleeved on the fixed axis, and the area of ​​the limiting piece is larger than the cross-sectional area of ​​the first through hole.

5. The vibration motor according to claim 4, characterized in that: The flexible circuit board is attached to and fixed on the inner surface of the cover body, and the coil is fixed on the inner surface of two diagonal positions of the side wall and is arranged corresponding to the permanent magnet.

6. The vibration motor according to claim 5, characterized in that: A limiting portion for limiting the fixed shaft is protruded from the central position of the inner surface of the bottom wall, and a sliding sheet is provided between the limiting portion and the fixed shaft, and the area of ​​the sliding sheet is larger than the cross-sectional area of ​​the limiting portion and the sliding bearing.

7. The vibration motor according to claim 6, characterized in that: The damping plates are arranged on the same side as the coils, and the coils are located between the damping plates.

8. The vibration motor according to claim 7, characterized in that: The second fixing portion is located between the long side surfaces of both sides of the rotor assembly and the side wall and on the horizontal extension line of the blind groove; the second fixing portion is located away from the coil on the same side thereof.

9. The vibration motor according to claim 8, characterized in that: The second fixing portion is an annular fixing groove protruding from the bottom wall or the inner surface of the cover.

10. The vibration motor according to claim 8, characterized in that The second fixing portion is a through hole penetrating the bottom wall or the cover body.

Images