Linear vibrator, swinging device and baby crib

Abstract

The utility model discloses a linear vibrator, a swing device and a baby crib, and relates to the technical field of vibration, and the linear vibrator comprises an eccentric wheel set and a driving device. The eccentric wheel set comprises a first eccentric wheel and a second eccentric wheel with the same mass. The driving device is used for driving the first eccentric wheel and the second eccentric wheel to rotate reversely at the same speed, the rotating axis of the first eccentric wheel is a first axis, the rotating axis of the second eccentric wheel is a second axis, and the first axis and the second axis are parallel or coincide. The distance between the first mass center of the first eccentric wheel and the first axis is equal to the distance between the second mass center of the second eccentric wheel and the second axis. The eccentric wheel set is driven by the driving device to achieve linear vibration, the linear vibration motor is simple in structure and low in cost, and compared with a traditional linear vibration motor, the driving efficiency is higher, and vibration with lower frequency can be generated.

Description

Technical Field

[0001] This utility model relates to the field of vibration devices, and in particular to a linear vibrator, a rocking device, and a crib. Background Technology

[0002] Currently, there are devices that require rocking, such as cribs, strollers, rocking beds, and rocking chairs. Taking cribs as an example, traditional cribs are usually rocked manually. With the development of technology, cribs that can be automatically rocked using a motor as a power source have also emerged, which can reduce the burden on caregivers to some extent.

[0003] In current rocking devices, the support part that carries the human body (object) usually swings around a certain axis of rotation. The power to drive the swing of this support part is usually provided by a motor driving an eccentric wheel to rotate. For example, Chinese utility model patent application number 202122783137.7 discloses a children's product component, a stroller, a crib and a rocker. The rocker includes a motor, an eccentric wheel and a connecting belt connecting the motor and the eccentric wheel. The motor drives the eccentric wheel to rotate through the connecting belt to realize the rocking.

[0004] During the rotation of the eccentric wheel, the center of mass rotates around the axis of rotation of the eccentric wheel, and the centrifugal force generated by the center of mass will cause the supporting part to sway. However, since the center of mass moves a full circle around the axis of rotation of the eccentric wheel, the direction of the swaying force generated is also circumferential and is not always perpendicular to the axis of rotation. In other words, the oscillation achieved by this structure is relatively chaotic and inefficient. For example, it will generate a force parallel to the axis of rotation, which can easily lead to damage to the oscillation device or an uncomfortable swaying sensation.

[0005] The applicant's research found that if a device that vibrates along a certain axis (i.e., linear vibration) can be set up to provide a driving force for swaying perpendicular to the axis of rotation, it would be beneficial to improve comfort and reliability. However, existing unidirectional vibration devices, such as linear vibration motors, usually drive the magnetic components to vibrate through coils. Their electromechanical conversion efficiency is low and their output power is weak, making it difficult to achieve the swaying motion of the load-bearing parts efficiently and reliably.

[0006] Therefore, it is necessary to improve the existing technology to overcome the aforementioned defects. Utility Model Content

[0007] The purpose of this invention is to provide a linear vibrator, a rocking device, and a crib, wherein the linear vibrator is capable of reliable linear vibration.

[0008] To achieve the aforementioned objectives of this utility model, in a first aspect, this utility model proposes a linear vibrator, comprising:

[0009] An eccentric wheel assembly, comprising a first eccentric wheel and a second eccentric wheel, wherein the absolute value of the mass difference between the first eccentric wheel and the second eccentric wheel is no more than 5% of the sum of the masses of the first eccentric wheel and the second eccentric wheel; and,

[0010] A driving device is used to drive the first eccentric wheel and the second eccentric wheel to rotate in opposite directions at the same speed. The rotation axis of the first eccentric wheel is a first axis, and the rotation axis of the second eccentric wheel is a second axis. The first axis and the second axis are parallel or coincident.

[0011] The distance between the first center of mass of the first eccentric wheel and the first axis is the first distance, and the distance between the second center of mass of the second eccentric wheel and the second axis is the second distance. The ratio of the absolute value of the difference between the first distance and the second distance to the sum of the first distance and the second distance does not exceed 5%.

[0012] In some embodiments, when the first centroid and the second centroid are misaligned along the projection direction of the first axis, a centroid connection line is formed between them, and the centroid connection line formed is always parallel when the first eccentric wheel and the second eccentric wheel rotate.

[0013] The first eccentric wheel and the second eccentric wheel have the same mass;

[0014] The first distance and the second distance are equal.

[0015] In some embodiments, the drive device includes a motor and a transmission mechanism connected between the motor and the eccentric wheel assembly, the transmission mechanism driving the first eccentric wheel and the second eccentric wheel to rotate in opposite directions at the same speed.

[0016] In some embodiments, the first axis and the second axis coincide, and the first eccentric wheel and the second eccentric wheel are spaced apart along the first axis.

[0017] In some embodiments, the linear vibrator further includes a housing, wherein the first eccentric wheel and the second eccentric wheel are rotatably connected to the housing;

[0018] Both the first eccentric wheel and the second eccentric wheel are circular, and their outer circumferential surfaces are provided with annular belt grooves. The driving device includes a motor fixed relative to the housing, a driving pulley connected to the motor, a driven pulley rotatably connected to the housing, and a belt connected between the driving pulley and the driven pulley. The axes of the driving pulley and the driven pulley are perpendicular to the first axis. The belt includes a first part and a second part spaced apart along the first axis. The first part and the second part are respectively located in the belt grooves of the first eccentric wheel and the second eccentric wheel.

[0019] In some embodiments, the first axis and the second axis are arranged in parallel, and the first eccentric wheel and the second eccentric wheel are spaced apart along the direction of the first axis or located at the same height.

[0020] The first axis and the second axis form a first plane. Along the projection direction of the first axis, when the first centroid and the second centroid are misaligned, the line connecting the centroids of the first centroid and the second centroid is always parallel to or coincides with the first plane.

[0021] In some embodiments, the drive device includes two motors for driving the first eccentric wheel and the second eccentric wheel to rotate, respectively.

[0022] In some embodiments, both motors are dual-axis motors, with each of the two output shafts of one motor connected to a first eccentric wheel, and each of the two output shafts of the other motor connected to a second eccentric wheel.

[0023] In some embodiments, the drive device further includes a speed synchronization mechanism for maintaining the first eccentric wheel and the second eccentric wheel rotating in opposite directions at the same speed;

[0024] The speed synchronization mechanism includes two gears respectively connected to the output shafts of the two motors, and the two gears mesh with each other; or,

[0025] The speed synchronization mechanism includes two transmission disks respectively connected to the output shafts of the two motors and a plurality of magnets evenly distributed around the center of the transmission disks. The magnets are magnetized along the first axis, and the magnetization directions of adjacent magnets are opposite. The coverage areas of the magnets on the two transmission disks after rotation are at least partially arranged opposite to each other.

[0026] Secondly, this utility model proposes a swinging device, comprising:

[0027] frame;

[0028] The support frame is rotatably connected to the frame; and,

[0029] As described in any of the embodiments above, the linear vibrator is connected to the support frame and is used to drive the support frame to swing.

[0030] In some embodiments, when the support frame is in its original position, the vibration direction of the linear vibrator is horizontal and perpendicular to the swing axis of the support frame.

[0031] Thirdly, this utility model proposes a crib, including a linear vibrator as described in any of the above embodiments or a rocking device as described in any of the above embodiments.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] In this invention, the eccentric wheel assembly includes two eccentric wheels of equal mass, and the distance between the center of mass and the axis of rotation of the two eccentric wheels is equal. When the driving device drives the two eccentric wheels to rotate in opposite directions at the same speed, the two eccentric wheels will cooperate to generate a reciprocating driving force along a certain axis, thereby achieving linear vibration. This invention achieves linear vibration by driving the eccentric wheel assembly through the driving device. It has a simple structure and low cost. Compared with traditional linear vibration motors, it has higher driving efficiency and can generate lower frequency vibrations, such as low-frequency vibrations of 0.5 to 200 Hz. Compared with single eccentric wheel vibration mechanisms, it has greater frequency uniformity and vibration direction uniformity. Attached Figure Description

[0034] Figure 1 This is a simplified structural diagram of a linear vibrator according to one embodiment of the present invention.

[0035] Figure 2 yes Figure 1 The diagram shows the centrifugal force decomposition of the eccentric wheel assembly from a top view. The two eccentric wheels are set on the same axis.

[0036] Figure 3 yes Figure 2 The diagram shows the decomposition of centrifugal force after the eccentric wheel assembly rotates 25°.

[0037] Figure 4 yes Figure 3 The diagram shows the decomposition of centrifugal force after the eccentric wheel assembly rotates 50°.

[0038] Figure 5 This is a schematic diagram of the centrifugal force decomposition at the center of mass of an eccentric wheel assembly according to an embodiment of this utility model. The axes of the two eccentric wheels are parallel.

[0039] Figure 6 yes Figure 5 The diagram shows the decomposition of centrifugal force after the eccentric wheel assembly rotates 90°.

[0040] Figure 7 This is a schematic diagram of the structure of an eccentric wheel according to one embodiment of the present invention.

[0041] Figure 8 This is a simplified structural diagram of a linear vibrator according to one embodiment of the present invention.

[0042] Figure 9This is a schematic diagram of the linear vibrator in Embodiment 1 of this utility model.

[0043] Figure 10 yes Figure 9 A schematic diagram of the drive unit, transmission mechanism, and eccentric wheel assembly.

[0044] Figure 11 yes Figure 9 The cross-sectional view of the structure shown.

[0045] Figure 12 This is a schematic diagram of the linear vibrator in Embodiment 2 of this utility model.

[0046] Figure 13 yes Figure 12 The top view of the linear vibrator shown.

[0047] Figure 14 This is a schematic diagram of the linear vibrator in Embodiment 2 of this utility model, in which two eccentric wheels are arranged at an interval.

[0048] Figure 15 This is a schematic diagram of the linear vibrator in Embodiment 3 of this utility model. The speed synchronization mechanism in the figure is a gear transmission mechanism.

[0049] Figure 16 This is a schematic diagram of the linear vibrator in Embodiment 3 of this utility model. The speed synchronization mechanism in the figure is a magnetic gear transmission mechanism.

[0050] Figure 17 yes Figure 16 A schematic diagram of the rotating disk and magnet.

[0051] Figure 18 yes Figure 16 A schematic diagram of the structure of the medium magnetic gear transmission mechanism.

[0052] Figure 19 This is a schematic diagram of the linear vibrator in Embodiment 4 of this utility model.

[0053] Figure 20 yes Figure 19 The diagram shown illustrates a linear vibrator equipped with a speed synchronization mechanism.

[0054] Figure 21 This is a schematic diagram of the linear vibrator in Embodiment 5 of this utility model. The transmission mechanism in the figure is gear rotation.

[0055] Figure 22 This is a schematic diagram of the linear vibrator in Embodiment 5 of this utility model. The transmission mechanism in the figure is a magnetic gear rotation.

[0056] Figure 23This is a schematic diagram of the linear vibrator in Embodiment 5 of this utility model. The transmission mechanism in the figure is a belt-driven mechanism.

[0057] Figure 24 This is a schematic diagram of the structure of a swing device according to an embodiment of the present invention. Detailed Implementation

[0058] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, it should be noted that, for ease of description, only the parts relevant to this application are shown in the accompanying drawings, not the entire structure. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application.

[0059] The terms “comprising” and “having”, and any variations thereof, used in this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus.

[0060] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0061] like Figure 1 As shown, this utility model proposes a linear vibrator, including an eccentric wheel assembly 1 and a drive device 2.

[0062] The eccentric wheel assembly 1 includes a first eccentric wheel 10 and a second eccentric wheel 11. The mass of the first eccentric wheel 10 is m1, and the mass of the second eccentric wheel 11 is m2. The ratio of the absolute value of the mass difference (m1-m2) between the first eccentric wheel 10 and the second eccentric wheel 11 to the sum of their masses (m1+m2) does not exceed 5%. In this case, the masses of the two eccentric wheels can be considered approximately the same. Preferably, the masses of the two eccentric wheels are the same.

[0063] The drive device 2 is used to drive the first eccentric wheel 10 and the second eccentric wheel 11 to rotate in opposite directions at the same speed (i.e., rotate in opposite directions with the same angular velocity). The rotation axis of the first eccentric wheel 10 is the first axis 10a, and the rotation axis of the second eccentric wheel 11 is the second axis 11a. The drive device 2 drives the first eccentric wheel 10 and the second eccentric wheel 11 to rotate in opposite directions at the same speed.

[0064] refer to Figure 2 The center of mass of the first eccentric wheel 10 is the first center of mass 10b, and the center of mass of the second eccentric wheel 11 is the second center of mass 11b. The distance between the first center of mass 10b and the first axis 10a is the first distance D1, and the distance between the second center of mass 11b and the second axis 11a is the second distance D2. The ratio of the absolute value of the difference between the first distance D1 and the second distance D2 (D1-D2) to the sum of the first distance D1 and the second distance D2 (D1+D2) does not exceed 5%. In this case, the distances between the two centers of mass and their respective axes of rotation can be considered approximately equal. Preferably, the first distance D1 and the second distance D2 are equal. The first axis 10a and the second axis 11a are set to be parallel or coincident so that the eccentric wheel assembly 1 can generate a reciprocating driving force in a certain axis direction, while the component force perpendicular to that axis direction is canceled out, achieving linear vibration.

[0065] Specifically, along the projection direction of the first axis 10a, when the first centroid 10b and the second centroid 11b are offset, a centroid connection line 1011 will be formed between them. When the first eccentric wheel 10 and the second eccentric wheel 11 rotate, the centroid connection line 1011 is set to always be parallel, thereby generating a driving force perpendicular to the centroid connection line 1011.

[0066] In some embodiments, such as Figures 1 to 4 As shown, Figure 1 In the structure shown, the first axis 10a and the second axis 11a coincide, and two eccentric wheels are spaced apart along the first axis 10a. The first eccentric wheel 10 is located above the second eccentric wheel 11, and the first eccentric wheel 10 and the second eccentric wheel 11 rotate in the directions of arrow A and arrow C, respectively. Figure 2 yes Figure 1 A top-view schematic diagram of the first eccentric wheel 10 and the second eccentric wheel 11. Figure 3 This is a schematic diagram showing the two eccentric wheels rotated 25° in opposite directions. Figure 4 This is a schematic diagram showing the two eccentric wheels rotating 50° in opposite directions.

[0067] In the diagram, the first eccentric wheel 10 and the second eccentric wheel 11 generate centrifugal forces during rotation, namely the first centrifugal force F1 and the second centrifugal force F2, which drive the linear vibrator to vibrate. The first centrifugal force F1 can be decomposed into a first component force F1a along the line connecting the centers of mass 1011 and a second component force F1b perpendicular to the first component force F1a. Similarly, the second centrifugal force F2 can be decomposed into a third component force F1c along the line connecting the centers of mass 1011 and a fourth component force F1d perpendicular to the third component force F1c. Since the two eccentric wheels have the same or approximately the same mass, and the distance between their centers of mass and their respective centers of rotation is equal or approximately equal, the first component force F1a and the third component force F1c are always equal in magnitude and opposite in direction, and can cancel each other out. The second component force F1b and the fourth component force F1d are always perpendicular to the line connecting the centers of mass 1011 and are always in the same direction. The superposition of the two amplifies the force in that direction, rather than weakens it. It is understandable that the resultant force of the second component force F1b and the fourth component force F1d generated by the two eccentric wheels is the driving force that drives the entire linear vibrator to vibrate. Therefore, the above structure can not only apply a driving force along a certain axis, but also increase the driving force in that direction, generating double the driving force. The vibration direction C of the linear vibrator (i.e., the direction of the driving force) is perpendicular to the line 1011 connecting the centers of mass.

[0068] In other embodiments, such as Figure 5 and Figure 6 As shown in the figure, the first eccentric wheel 10 is located on one side of the second eccentric wheel 11 in the horizontal direction. Figure 5 This is a schematic diagram of the first eccentric wheel 10 and the second eccentric wheel 11 from a top view. Figure 6 yes Figure 5 A schematic diagram showing the two eccentric wheels rotating 90° in opposite directions. The diagram also shows the centrifugal force and corresponding component forces of the two eccentric wheels. It can be seen that when the first eccentric wheel 10 is located on one side of the second eccentric wheel 11, as long as the line connecting the centers of mass 1011 remains parallel during the motion, the first component force F1a and the third component force F1c can always cancel each other out, while the second component force F1b and the fourth component force F1d can always be superimposed and increased, thus generating vibration only in the direction perpendicular to the line connecting the centers of mass 1011.

[0069] In other words, when the two eccentric wheels rotate, they generate a vibrational force only in the direction perpendicular to the line connecting their centers of mass 1011 on the plane of rotation, achieving unidirectional reciprocating vibration. Traditional linear motors experience a sharp decrease in efficiency at ultra-low frequencies, and their effectiveness is significantly reduced due to the inertia, which cannot be maximized. The linear vibrator of this invention, however, can achieve excellent vibration effects in a very low frequency range. For example, ordinary linear motors struggle to operate below 20Hz, while the linear vibrator of this invention can reliably operate within the range of 0.5 to 200Hz. When used in a crib, the operating frequency can be set to 1 to 2Hz, and when used in a mattress, the operating frequency can be set to 7.5 to 8Hz—a low frequency that ordinary linear motors can hardly achieve.

[0070] It is understandable that the shape and structure of the eccentric wheel are not limited. For example, it can be set as a disc and a counterweight can be added to the disc to change the position of the center of mass so that it is offset from the axis of rotation. Alternatively, the eccentric wheel can be set as a cam shape. Figure 7 In the illustrated embodiment, the eccentric wheel is disc-shaped, with its center connected to a shaft such as a rotating shaft or an output shaft. A plurality of counterweight grooves 102 are provided on one side of the disc. By selectively fixing counterweights 103 within the counterweight grooves 102, the position of the center of mass can be changed. Optionally, the first eccentric wheel 10 and the second eccentric wheel 11 have the same structure.

[0071] In some embodiments, such as Figures 8 to 10 As shown, the drive device 2 includes a motor 20 and a transmission mechanism 3 connected between the motor 20 and the eccentric wheel assembly 1. The transmission mechanism 3 drives the first eccentric wheel 10 and the second eccentric wheel 11 to rotate in opposite directions at the same speed. The transmission mechanism 3 can adopt a structure in the prior art, such as a belt drive mechanism, a gear drive mechanism, or a magnetic gear drive mechanism.

[0072] In other embodiments, such as Figure 12 As shown, the drive device 2 includes two relatively fixed motors 20. For example, the two motors 20 can be mounted on the same housing, or connected and fixed by a bracket, etc. The two motors 20 respectively drive the first eccentric wheel 10 and the second eccentric wheel 11 to rotate in opposite directions at the same speed. Optionally, such as... Figure 15 and Figure 16 As shown, it also includes a speed synchronization mechanism 21 to keep the two eccentric wheels rotating in opposite directions at the same speed. The speed synchronization mechanism 21 can also adopt the structure in the prior art, such as belt drive mechanism, gear drive mechanism or magnetic gear drive mechanism, etc.

[0073] Example 1

[0074] like Figures 9 to 11As shown, the drive device 2 includes a housing 4, a motor 20 fixedly connected to the housing 4, and a transmission mechanism 3 connecting the motor 20 and the eccentric wheel assembly 1. The first eccentric wheel 10 and the second eccentric wheel 11 are both rotatably connected to the housing 4. The motor 20 drives the first eccentric wheel 10 and the second eccentric wheel 11 to rotate in opposite directions at the same speed through the transmission mechanism 3.

[0075] In this embodiment, the transmission mechanism 3 is a belt drive mechanism, which includes a driving pulley 50 connected to the output shaft 200 of the motor 20, a driven pulley 51 rotatably connected to the housing 1, and a belt 52 connecting the driving pulley 50 and the driven pulley 51. The structures of the first eccentric wheel 10 and the second eccentric wheel 11 can be referred to Figure 7 Both are circular, with annular belt grooves 100 on their outer circumferences. Each of the two eccentric wheels is rotatably connected to the outer casing 4 via a rotating shaft 13. The rotating shaft 13 can be connected to the outer casing 4 and / or the eccentric wheels via bearings to improve the smoothness of rotation.

[0076] Optionally, the axes of the driving pulley 50 and the driven pulley 51 are perpendicular to the first axis 10a. The belt 52 includes a first portion 520 and a second portion 521 spaced apart along the first axis 10a, respectively located within the belt grooves 100 of the first eccentric pulley 10 and the second eccentric pulley 11. When the motor 20 drives the driving pulley 50 to rotate, the belt 52 drives the driving pulley 50 and the driven pulley 51 to rotate. Since the first portion 520 and the second portion 521 move in opposite directions but at the same speed, the first eccentric pulley 10 and the second eccentric pulley 11 will move in opposite directions at the same speed.

[0077] The outer casing 4 may include a first casing 40 and a second casing 41 that are connected to each other. The two casings form a relatively closed receiving space. The eccentric wheel set 1, the drive device 2 and the transmission mechanism 3 are all located inside the outer casing 4. One of the two eccentric wheels is rotatably connected to the first casing 40 and the other is rotatably connected to the second casing 41.

[0078] The aforementioned transmission mechanism 3 adopts a flattened design, which can effectively reduce the size in the thickness direction, thereby facilitating the arrangement of the linear vibrator and avoiding excessively increasing the size of the equipment using the linear vibrator.

[0079] Example 2

[0080] In this embodiment, the first eccentric wheel 10 and the second eccentric wheel 11 are offset in the horizontal direction, the first axis 10a and the second axis 11a are arranged in parallel, and each of the two eccentric wheels is driven by a motor 20. In this embodiment, as... Figure 12 As shown, the first eccentric wheel 10 and the second eccentric wheel 11 are positioned at the same height. In other embodiments, such as Figure 14As shown, the two eccentric wheels can also be spaced apart along the direction of the first axis 10a.

[0081] like Figure 13 As shown, Figure 13 for Figure 12 The diagram shown is a top-view illustration. The first axis 10a and the second axis 11a form a first plane 10c. Along the projection direction of the first axis 10a (i.e., the top-view direction), when the first center of mass 10b and the second center of mass 11b are offset, the line 1011 connecting the centers of mass 10b and 11b is always parallel to or coincides with the first plane 10c. Thus, the direction of the vibration force generated by the eccentric wheel assembly 1 is also perpendicular to the first plane 10c, making it easier to determine the vibration direction. Optionally, the two eccentric wheels can be arranged symmetrically in the top-view direction.

[0082] like Figure 12 As shown, in this embodiment, the driving device 2 includes two motors 20. The output shaft 200 of one motor 20 is connected to the first eccentric wheel 10 and is used to drive the first eccentric wheel 10 to rotate. The output shaft 200 of the other motor 20 is connected to the second eccentric wheel 11 and is used to drive the second eccentric wheel 11 to rotate.

[0083] The two motors 20 are fixed relative to each other. For example, the two motors 20 can be directly connected together, or they can be connected together to a connecting frame 23. When the output shafts 200 of the two motors 20 are controlled to move in opposite directions at the same angular velocity, the two eccentric wheels will also move in opposite directions at the same speed, thereby realizing the unidirectional vibration of the linear vibrator.

[0084] Example 3

[0085] like Figure 15 and Figure 16 As shown, compared with Embodiment 2, this embodiment further includes a speed synchronization mechanism 21 for maintaining the first eccentric wheel 10 and the second eccentric wheel 11 rotating in opposite directions at the same speed. The speed synchronization mechanism 21 can be, for example, a gear drive, belt drive, or magnetic gear drive mechanism.

[0086] As an example, such as Figure 15 As shown, the speed synchronization mechanism 21 is a gear transmission mechanism, which includes two gears 210 that are respectively connected to the output shafts 200 of the two motors 20. The two gears 210 mesh with each other, and the meshing of the gears 210 ensures that the two output shafts 200 can rotate in opposite directions at the same speed.

[0087] As an example, such as Figures 16 to 18As shown, the speed synchronization mechanism 21 is a magnetic gear transmission mechanism, which includes two transmission disks 213 respectively connected to the output shafts 200 of two motors 20. Multiple magnets 214 are evenly distributed around the center of each transmission disk 213. The magnets 214 are magnetized along the first axis 10a, and the magnetization directions of adjacent magnets 214 are opposite. The two transmission disks 213 are spaced apart along the first axis 10a, and preferably, the areas covered by the magnets 214 on the two transmission disks 213 after rotation are at least partially opposite to each other to increase the interaction force between the two transmission disks 213. For example, the center of the magnet 214 can be configured to be equidistant from the first axis 10a and the second axis 11a.

[0088] Example 4

[0089] The difference between this embodiment and embodiment 3 is that, as Figure 19 As shown, in this embodiment, both motors 20 are dual-axis motors, and each motor 20 has two output shafts 200 extending from both ends. Each of the two output shafts 200 of one motor 20 is connected to a first eccentric wheel 10, and each of the two output shafts 200 of the other motor 20 is connected to a second eccentric wheel 11. That is, the drive device 2 can simultaneously drive both sets of eccentric wheel sets 1, further increasing the driving force.

[0090] It is understandable that, such as Figure 20 As shown, the above structure can also be augmented with a speed synchronization mechanism 21.

[0091] Example 5

[0092] like Figure 22 and Figure 22 As shown, the difference between this embodiment and embodiment 2 is that in this embodiment, the driving device 2 includes only one motor 20, and also includes a transmission mechanism 3 for driving two eccentric wheels to rotate in opposite directions at the same speed. The motor 20 is fixedly connected to the connecting frame 23, and the output shaft 200 of the motor 20 is connected to the first eccentric wheel 10. The second eccentric wheel 11 is connected to the connecting frame 23 via a rotating shaft 13 and can rotate relative to the connecting frame 23. The transmission mechanism 3 is connected between the rotating shaft and the output shaft 200, and can be, for example, a gear drive, belt drive, magnetic gear drive, or a combination of multiple mechanisms.

[0093] As an example, transmission mechanism 3 is a gear transmission mechanism, such as... Figure 21As shown, the transmission mechanism 3 includes a driving gear 30 connected to the output shaft 200 of the motor 20 and a driven gear 31 meshing with the driving gear 30. The driven gear 31 is connected to the rotating shaft 13. After the motor 20 rotates, the driving gear 30 drives the driven gear 31 to rotate, which in turn drives the rotating shaft 13 and the second eccentric wheel 11 to rotate. Since the two gears always move in opposite directions at the same speed, the two eccentric wheels will also move in opposite directions at the same speed.

[0094] As an example, transmission mechanism 3 is a magnetic gear transmission mechanism, such as... Figure 22 As shown, its structure can refer to the structure of the magnetic gear transmission mechanism in Embodiment 3. The difference is that the two transmission disks 213 are respectively connected to the output shaft 200 and the rotating shaft 13. When the transmission disk 213 on the output shaft 200 is driven to rotate, it will drive the transmission disk 213 on the rotating shaft 13 to rotate through the magnetic force of the magnet 214, thereby realizing the same speed and opposite movement of the two eccentric wheels.

[0095] As an example, transmission mechanism 3 is a belt drive, such as... Figure 23 As shown, it includes a driving pulley 50 connected to the output shaft 200, a driven pulley 51 connected to the rotating shaft 13, and a belt 52 connecting the driving pulley 50 and the driven pulley 51. The belt 52 drives the second eccentric pulley 11 to rotate in the same direction as the first eccentric pulley 10 at the same speed. Optionally, the driving pulley 50 and the driven pulley 51 are synchronous pulleys, and the belt is a synchronous belt.

[0096] This utility model also proposes a control method for a linear vibrator, which can be any of the linear vibrators described in the above embodiments.

[0097] In some embodiments, the control method of the linear vibrator includes the following steps: driving the first eccentric wheel 10 and the second eccentric wheel 11 to rotate continuously for a full revolution.

[0098] It is understandable that during the full rotation of the two eccentric wheels, they always move at the same speed but in opposite directions. Their centers of mass also rotate around their respective axes, and the change in the position of the centers of mass results in a change in the direction of the driving force (reversing), thus achieving reciprocating vibration. Different frequencies of vibration can be achieved by controlling the rotation speed of the eccentric wheels.

[0099] In other embodiments, the control method of the linear vibrator includes the following steps: driving the first eccentric wheel 10 and the second eccentric wheel 11 to reciprocate.

[0100] Similarly, during the reciprocating oscillation of the first eccentric wheel 10 and the second eccentric wheel 11, they always move in opposite directions at the same speed. When the first eccentric wheel 10 and the second eccentric wheel 11 reciprocate, for example, rotating in the opposite direction after each preset angle, a faster change in the direction of vibration can be achieved.

[0101] In addition to achieving vibrations at different frequencies, the reciprocating oscillation control method can also change the amplitude of the driving force. For example, reciprocating oscillation within a 90° range will produce a larger amplitude and a stronger vibration than oscillation within a 45° range. Different vibration sensations can be adjusted by changing the amplitude of the oscillation. Optionally, the oscillation amplitude of the first eccentric wheel 10 and the second eccentric wheel 11 does not exceed 180°, that is, the angle of a single oscillation in any direction does not exceed 180°. Further optionally, the oscillation amplitude of the first eccentric wheel 10 and the second eccentric wheel 11 does not exceed 90°.

[0102] Optionally, the rotation of the eccentric wheel can be controlled by an audio signal, thereby generating a vibration related to parameters such as the frequency and intensity of the audio signal, producing an effect that moves in rhythm with the music.

[0103] This utility model also proposes a swinging device, such as Figure 24 As shown, it includes a frame 60, a support frame 61, and a linear vibrator 7 as described above.

[0104] The support frame 61 and the frame 610 can be rotatably connected. For example, they can be connected to the frame 60 via a rotating shaft 610, or they can be suspended from the frame 60 by a rope, thus achieving a rotatable connection.

[0105] The linear vibrator 7 is connected to the support frame 61 and is used to drive the support frame 61 to swing around the rotation axis 610.

[0106] Normally, the support frame 61 will swing around a swing axis 611. Since the driving force provided by the linear vibrator 77 has good directionality, the direction of the driving force can be adjusted to match the swing direction of the support frame 61, thereby driving the support frame 61 to swing more efficiently. Optionally, when the support frame 61 is in its original position, the vibration direction of the linear vibrator 77 is horizontal and perpendicular to the swing axis 611 of the support frame 61. In this way, the driving force will not generate a component force along the swing axis 611, preventing the swing from becoming chaotic or even damaging related components.

[0107] This rocking device can be used in devices such as cribs and strollers.

[0108] This utility model also proposes a crib that includes a linear vibrator or rocking device as described above.

[0109] The above are merely specific embodiments of this utility model. Any improvements made based on the concept of this utility model shall be considered within the scope of protection of this utility model.

Claims

1. A linear vibrator, characterized in that: include: An eccentric wheel assembly (1), comprising a first eccentric wheel (10) and a second eccentric wheel (11), wherein the ratio of the absolute value of the mass difference between the first eccentric wheel (10) and the second eccentric wheel (11) to the sum of the masses of the first eccentric wheel (10) and the second eccentric wheel (11) does not exceed 5%; and A driving device (2) for driving the first eccentric wheel (10) and the second eccentric wheel (11) to rotate at the same speed and in opposite directions, the rotation axis of the first eccentric wheel (10) being a first axis (10a), the rotation axis of the second eccentric wheel (11) being a second axis (11a), and the first axis (10a) and the second axis (11a) being parallel or coincident; The distance between the first center of mass (10b) of the first eccentric wheel (10) and the first axis (10a) is a first distance, the distance between the second center of mass (11b) of the second eccentric wheel (11) and the second axis (11a) is a second distance, and the ratio of the absolute value of the difference between the first distance and the second distance to the sum of the first distance and the second distance does not exceed 5%.

2. The linear vibrator according to claim 1, characterized in that Along the projection direction of the first axis (10a), when the first mass center (10b) and the second mass center (11b) are offset, a mass center connection line (1011) is formed between the two, and when the first eccentric wheel (10) and the second eccentric wheel (11) rotate, the formed mass center connection line (1011) is always parallel; The first eccentric wheel (10) and the second eccentric wheel (11) have the same mass; The first distance and the second distance are equal.

3. The linear vibrator according to claim 1, wherein: The driving device (2) comprises a motor (20) and a transmission mechanism (3) connected between the motor (20) and the eccentric wheel group (1), wherein the transmission mechanism (3) drives the first eccentric wheel (10) and the second eccentric wheel (11) to rotate at the same speed and in opposite directions.

4. The linear vibrator according to claim 1, wherein: The first axis (10a) and the second axis (11a) coincide with each other, and the first eccentric wheel (10) and the second eccentric wheel (11) are arranged at intervals along the first axis (10a).

5. The linear vibrator according to claim 4, characterized in that It also includes a housing (4), and the first eccentric wheel (10) and the second eccentric wheel (11) are both rotatably connected to the housing (4); The first eccentric wheel (10) and the second eccentric wheel (11) are both circular, and an annular belt groove (100) is arranged on the outer circumference thereof. The driving device (2) comprises a motor (20) fixed relative to the housing (4), a driving pulley (50) connected to the motor (20), a driven pulley (51) rotatably connected to the housing (4), and a belt (52) connected between the driving pulley (50) and the driven pulley (51), wherein the axes of the driving pulley (50) and the driven pulley (51) are perpendicular to the first axis (10a), and the belt (52) comprises a first part (520) and a second part (521) arranged at intervals along the first axis (10a), and the first part (520) and the second part (521) are respectively located in the belt grooves (100) of the first eccentric wheel (10) and the second eccentric wheel (11).

6. The linear vibrator according to claim 1, wherein: The first axis (10a) and the second axis (11a) are arranged in parallel, and the first eccentric wheel (10) and the second eccentric wheel (11) are arranged at intervals along the direction of the first axis (10a) or are located at the same height position; The first axis (10a) and the second axis (11a) form a first plane (10c). Along the projection direction of the first axis (10a), when the first center of mass (10b) and the second center of mass (11b) are offset, a center of mass line (1011) between the first center of mass (10b) and the second center of mass (11b) is always parallel to or coincides with the first plane (10c).

7. The linear vibrator according to claim 6, characterized in that The driving device (2) comprises two motors (20) respectively used to drive the first eccentric wheel (10) and the second eccentric wheel (11) to rotate.

8. The linear vibrator according to claim 7, wherein: Both motors (20) are dual-shaft motors, wherein the two output shafts (200) of one motor (20) are each connected to one of the first eccentric wheels (10), and the two output shafts (200) of the other motor (20) are each connected to one of the second eccentric wheels (11).

9. The linear vibrator according to claim 7, wherein: The driving device (2) further comprises a speed synchronization mechanism (21) for maintaining the first eccentric wheel (10) and the second eccentric wheel (11) rotating at the same speed and in opposite directions; The speed synchronization mechanism (21) comprises two gears (210) respectively connected to the output shafts (200) of the two motors (20), and the two gears (210) are meshed with each other; or, The speed synchronization mechanism (21) comprises two transmission disks (213) respectively connected to the output shafts (200) of the two motors (20) and a plurality of magnets (214) evenly distributed around the center of the transmission disk (213); the magnets (214) are magnetized along the first axis (10a), and the magnetization directions of two adjacent magnets (214) are opposite; and the covered areas of the magnets (214) on the two transmission disks (213) after rotation are at least partially arranged relative to each other.

10. A swing device, characterized in that: include: Rack (60); A carrier frame (61) rotatably connected to the frame (60); as well as, The linear vibrator according to any one of claims 1 to 9, wherein the linear vibrator is connected to the supporting frame (61) and is used to drive the supporting frame (61) to swing.

11. The swing device according to claim 10, characterized in that: When the support frame (61) is in the original position, the vibration direction of the linear vibrator is in a horizontal state and is perpendicular to the swing axis (611) of the support frame (61).

12. A baby crib, characterized in that: It comprises a linear vibrator as claimed in any one of claims 1 to 9 or a rocking device as claimed in claim 10 or 11.

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