Linear vibration mechanism based on rotary motor and capable of avoiding unnecessary component force

Abstract

The utility model belongs to the technical field of force feedback and tactile simulation, and particularly relates to a linear vibration mechanism based on a rotary motor and capable of avoiding unnecessary component force, which comprises the rotary motor, an eccentric wheel and a balancing weight, the eccentric wheel is fixedly connected with a motor shaft of the rotary motor, a rectangular movement groove for accommodating the eccentric wheel is arranged on the lower end face of the balancing weight, and the eccentric wheel is arranged in the rectangular movement groove. The device is characterized in that a round-head rectangular hole is formed in the middle of the bottom wall of the rectangular movement groove, the length direction of the round-head rectangular hole is orthogonal to the length direction of the rectangular movement groove, and the length direction of the round-head rectangular hole is perpendicular to the length direction of the rectangular movement groove. And the motor shaft extends out of the protruding part of the eccentric wheel, enters the round-head rectangular hole and is in transition fit or clearance fit with the round-head rectangular hole. Compared with the prior art, through the specific round-head rectangular hole design, the balancing weight is more stable relative to floating installation of an eccentric wheel, and unnecessary component force generated in a large-seismic-quantity application scene is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of force feedback and tactile simulation, in particular to a linear vibration mechanism based on a rotary motor and avoiding unnecessary force distribution. Background Art

[0002] The statements in this section merely provide background technology related to the present invention and do not necessarily constitute prior art.

[0003] With the development of virtual reality (VR), augmented reality (AR) and the gaming industry, force feedback and tactile simulation technology have become one of the important technologies to enhance user experience. Force feedback and tactile simulation provide tactile simulation signals to the vibration motor in the form of pulse width modulation (PWM). The vibration motor transmits this signal to human skin after resonance amplification to achieve the purpose of tactile simulation.

[0004] The input waveform and output waveform of the conventional rotary vibration motor are as follows: Figure 1 As shown, due to the limited effective range in its resonant frequency and the waveform containing too much directional force interference, the waveform has noise, resulting in unclear signal conversion and cannot be applied to tactile simulation; but its advantages are very promising: large vibration volume, long life, and at the same vibration volume, its manufacturing cost is less than half of that of a linear vibration motor.

[0005] The input waveform and output waveform of the conventional linear vibration motor are as follows: Figure 2 As shown, its effective response frequency E is high, the start-stop response is fast, the waveform direction is unique, and the signal conversion is clear; but its special suspension structure design is not conducive to the application of large dynamic capacity feedback and is also not durable, so it has a short life and high cost.

[0006] The inventor previously disclosed a linear vibration mechanism based on a rotary motor with publication number CN217087672U, in which the double arc slots provided by the counterweight block have the function of providing the conversion of radial motion kinetic energy, and the yielding part has the function of non-motion kinetic energy conversion, thereby effectively converting the torque provided by the motor into linear motion. However, this technical solution performs well in small-volume application scenarios, but in large-volume application scenarios, it is easy to generate obvious, additional, and unnecessary component forces, resulting in unclear signal conversion. Utility Model Content

[0007] In order to overcome the shortcomings of the prior art, the utility model provides a linear vibration mechanism based on a rotary motor to avoid unnecessary force distribution. The mechanism can effectively convert into linear vibration with high kinetic energy and clear direction while maintaining the advantages of low cost and long life of the rotary motor, thereby effectively expanding the application of force feedback, no longer limited to the touch of the fingers, and even the touch of the skin of the whole body. To this end, the technical solution adopted by the utility model is:

[0008] A linear vibration mechanism based on a rotary motor to avoid unnecessary force components includes a rotary motor, an eccentric wheel and a counterweight block, wherein the eccentric wheel is fixedly connected to the motor shaft of the rotary motor, and a rectangular motion groove for accommodating the eccentric wheel is provided on the lower end surface of the counterweight block, and the counterweight block is configured to be floatingly installed relative to the eccentric wheel. It is characterized in that a round-headed rectangular hole is provided in the middle of the bottom wall of the rectangular motion groove, and the length direction of the round-headed rectangular hole is orthogonal to the length direction of the rectangular motion groove, and the motor shaft extends beyond the protrusion of the eccentric wheel into the round-headed rectangular hole and is transitionally fitted or clearance-fitted with it.

[0009] Furthermore, two long side surfaces of the rectangular motion groove are transitionally fitted or clearance-fitted with the eccentric wheel, and there is a gap between the bottom wall of the rectangular motion groove and the top surface of the eccentric wheel.

[0010] Furthermore, a bearing is arranged outside the eccentric wheel, and the two long sides of the rectangular motion groove have a transition fit or a clearance fit with the outer ring of the bearing, and there is a gap between the bottom wall of the rectangular motion groove and the top surface of the bearing and the eccentric wheel.

[0011] Furthermore, the length of the round-headed rectangular hole is greater than twice the eccentricity of the eccentric wheel.

[0012] Furthermore, the bearing is a sliding bearing or a ball bearing.

[0013] Furthermore, the counterweight is floatingly mounted on the rotary motor via four spring sheets, the upper end of the spring sheet is fixed to the counterweight, and the lower end is fixed to the housing of the rotary motor, and the swingable direction of the spring sheet is consistent with the length direction of the round rectangular hole.

[0014] Compared with the prior art, the beneficial technical effects of the utility model are:

[0015] Improve the accuracy of linear vibration: Through the specific round-head rectangular hole design, the floating installation of the counterweight block relative to the eccentric wheel is more stable, reducing the unnecessary force generated in large-vibration application scenarios, thereby improving the accuracy of linear vibration and the clarity of signal conversion.

[0016] Expanded application scope: Since the improved linear vibration mechanism can provide high-kinetic energy and clear-direction linear vibration, force feedback technology can be applied to a wider range of tactile simulation scenarios, not only limited to finger touch, but also extended to whole-body skin touch.

[0017] Maintaining cost-effectiveness: The utility model avoids unnecessary force distribution while maintaining the low cost advantage of the rotary motor, so that in the application of force feedback and tactile simulation technology, high-performance vibration feedback can be achieved at a lower cost.

[0018] Enhanced durability and reliability: Improved mechanism design helps improve the durability and reliability of the vibration motor, especially in high-vibration applications, reducing wear or failures caused by improper structural design.

[0019] Optimized dynamic response: The floating installation of the counterweight and the round-head rectangular hole design optimize the dynamic response performance of the motor, allowing the linear vibration motor to respond to input signals more quickly and achieve faster start-stop control.

[0020] Reduce noise and vibration interference: Improved design may help reduce noise generated during vibration and vibration interference in undesired directions, providing users with a clearer and more comfortable tactile feedback experience.

[0021] Improved energy efficiency: By more efficiently converting torque into linear motion, it is possible to improve the energy efficiency of the entire vibration mechanism and reduce energy losses.

[0022] Simplified manufacturing and maintenance: The new design simplifies the structure and reduces the number of components, which simplifies the manufacturing process and reduces maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a waveform diagram of the input and output of a traditional rotary vibration motor.

[0024] Figure 2 It is a waveform diagram of the input and output of a traditional linear vibration motor.

[0025] Figure 3 It is a structural schematic diagram of the utility model.

[0026] Figure 4 It is a component separation diagram of the utility model.

[0027] Figure 5 It is a component separation diagram of the utility model from another perspective.

[0028] Figure 6 These are five typical state diagrams of the eccentric wheel and the counterweight block of the utility model during relative motion.

[0029] Figure 7 This is a force analysis diagram of the eccentric wheel and the counterweight block of the utility model.

[0030] Numbers in the figure: rotary motor-10, motor shaft-11, protrusion-111, spring piece-20, key-30, eccentric wheel-40, bearing-50, counterweight block-60, round-head rectangular hole-61, rectangular motion groove-62, long side surface-621, driving torque-T0, reaction torque-T1, upper friction component-F21, lower friction component-F22. DETAILED DESCRIPTION

[0031] It should be noted that the following detailed descriptions are all exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0032] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the utility model. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0033] like Figure 3-5A linear vibration mechanism shown in the figure comprises a rotary motor 10, an eccentric wheel 40 and a counterweight 60. The eccentric wheel 40 and the motor shaft 11 of the rotary motor 10 are provided with keyways at corresponding positions, and a key 30 is embedded in the keyway. The eccentric wheel 40 and the rotary motor 10 are fixedly connected together through the key 30. The lower end surface of the counterweight 60 is provided with a rectangular motion groove 62 for accommodating the eccentric wheel 40. A round-headed rectangular hole 61 is provided in the middle of the bottom wall of the rectangular motion groove 62. The length direction of the round-headed rectangular hole 61 is orthogonal to the length direction of the rectangular motion groove 62. The motor shaft 11 exceeds the protrusion 111 of the eccentric wheel 40 and enters the round-headed rectangular hole 61 and has a transition fit or a clearance fit with the protrusion 111 of the eccentric wheel 40. A bearing 50 is arranged outside the eccentric wheel 40. The two long sides 621 of the rectangular motion groove 62 have a transition fit or a clearance fit with the outer ring of the bearing 50. There is a gap between the bottom wall of the rectangular motion groove 62 and the top surface of the bearing 50 and the eccentric wheel 40. The bearing 50 is a sliding bearing or a ball bearing, and the ball bearing shown in the figure is a ball bearing. The upper ends of the four spring pieces 20 are fixedly connected to the counterweight block 60, and the lower ends are fixedly connected to the housing of the rotary motor 10. The swingable direction of the spring piece 20 is consistent with the length direction of the round rectangular hole 61. The four spring pieces 20 realize that the counterweight block 60 is configured to be floatingly installed relative to the eccentric wheel 40. The floating installation means that the counterweight block 60 has a large degree of freedom or activity in the left and right directions shown in the figure, has a very small degree of freedom or activity in the up and down directions, and has almost no degree of freedom or activity in the front and back directions.

[0034] After the driving signal is input to drive the rotary motor 10, Figure 6 As shown in the relative motion diagram, first, the eccentric wheel 40 is Figure 6 As shown, it rotates counterclockwise. Figure 6 In a, the motor shaft 11 is located in the round rectangular hole 61 of the counterweight 60. Since the left and right sides are restricted, and the right side space of the rectangular motion slot 62 accommodates the eccentricity of the eccentric wheel 40, the counterweight 60 is still located at the center position in the vertical direction. When the eccentric wheel 40 rotates 90° to reach Figure 6 At this time, the eccentricity will drive the counterweight 60 to rotate upward to the upper vertex of the movement; then the eccentric wheel 40 rotates another 90° to reach Figure 6 The eccentricity of the eccentric wheel 40 moves to the left side of the rectangular motion slot 62, and the counterweight 60 returns to the center position in the vertical direction; when the eccentric wheel 40 rotates another 90° to reach the Figure 6 At this time, the eccentricity of the eccentric wheel 40 drives the counterweight 60 downward to the lower vertex of the movement; then, when the eccentric wheel 40 rotates another 90°, it reaches the position as shown in FIG. Figure 6 e、and Figure 6 When the position of a is completely consistent with that of the rotation, a rotation is completed, which also means that a linear motion is completed. This cycle is repeated to achieve linear vibration.

[0035] like Figure 7 As shown, the bearing 50 rotates in the rectangular motion groove 62, and the bearing 50 and the counterweight 60 will generate an upper friction component F21 and a lower friction component F22 that offset each other, which helps to reduce unnecessary components and ensure that the counterweight 60 mainly performs linear motion in the up and down directions. The driving torque T0 output by the rotary motor 10 generates a reaction torque T1 of relative motion with the bearing 50. Due to the design of the lateral space, the eccentric wheel 40 can move freely without generating other components, thereby ensuring the accuracy and efficiency of the linear vibration.

[0036] The technical solution of this embodiment is able to achieve a large earthquake magnitude and avoid unnecessary force components mainly based on the following technical features:

[0037] Floating installation mechanism: The counterweight 60 is installed in a floating manner relative to the eccentric wheel 40, and is connected to the housing of the rotary motor 10 through the spring 20, allowing the counterweight to have a certain degree of freedom in a specific direction. This design can provide the necessary flexibility under large earthquakes while reducing unnecessary stress caused by structural rigidity.

[0038] Optimized kinematic design: The special geometric design of the rectangular motion slot 62 and the round-headed rectangular hole 61 ensures the linear motion of the counterweight 60 in the up-and-down direction, while limiting unnecessary motion in the left-right and front-and-back directions. This design helps to concentrate energy output and achieve a large shock volume.

[0039] Reasonable layout of the bearing 50: The bearing 50 is disposed outside the eccentric wheel 40, allowing the eccentric wheel to rotate in the counterweight block 60, while performing transition fit or clearance fit with the long side surface 621 of the rectangular motion slot 62. This layout reduces the friction between the eccentric wheel and the counterweight block, avoiding unnecessary force generated by friction.

[0040] Mutual offset of frictional forces: the upper frictional force F21 and the lower frictional force F22 between the bearing 50 and the counterweight 60 offset each other, reducing the lateral force of the system and ensuring that the force transmission is more concentrated in the direction of linear vibration.

[0041] Precise torque transmission: The driving torque T0 output by the rotary motor 10 is transmitted to the counterweight 60 through the eccentric wheel 40, and the bearing 50 generates the reaction torque T1 of relative motion. This design helps to accurately control the torque transmission and avoid unnecessary force caused by uneven torque transmission.

[0042] Directional support of the spring pieces 20: The four spring pieces 20 provide support for the counterweight block 60 in a specific direction, and the swingable direction thereof is consistent with the length direction of the round-headed rectangular hole 61, thereby ensuring the stability and accuracy of the counterweight block during linear vibration.

[0043] Spatial layout of the structure: Due to the reasonable layout of the lateral space, the eccentric wheel 40 can move freely without constraints in other directions, which helps to achieve a large amount of vibration while avoiding the generation of lateral force components.

[0044] Through the comprehensive application of these technical features, the technical solution of this embodiment can achieve high-efficiency and high-kinetic linear vibration output while maintaining a simple structure and cost-effectiveness, and is suitable for the needs of virtual reality, augmented reality and gaming industries for force feedback and tactile simulation technology.

[0045] In another embodiment, the bearing 50 is discarded, and the two long sides 621 of the rectangular motion groove 62 are directly transition-fitted or clearance-fitted with the eccentric wheel 40, and there is a gap between the bottom wall of the rectangular motion groove 62 and the top surface of the eccentric wheel 40. Discarding the bearing 50 can reduce the number of components, simplify the overall structure, reduce manufacturing costs and assembly complexity, and reduce the need for maintenance and replacement.

[0046] In another preferred embodiment, the length of the round-headed rectangular hole 61 is greater than twice the eccentricity of the eccentric wheel 40. Due to the influence of the inertial force, when the eccentric wheel 40 rotates, the counterweight 60 may exceed the motion trajectory of twice the eccentricity due to the inertial effect. Therefore, by setting the length of the round-headed rectangular hole 61 to be greater than twice the eccentricity of the eccentric wheel 40, sufficient movement space can be provided for the counterweight 60 to ensure that when the eccentric wheel 40 rotates, the counterweight 60 can achieve the required linear vibration amplitude and effect. Providing additional space to accommodate the round-headed rectangular hole 61 with inertial movement helps to maintain the stability of the structure during the rotation of the eccentric wheel 40, avoid collisions or noise caused by vibration, and thus improve the running stability of the entire mechanism. At the same time, this design also provides a certain amount of redundant space to cope with possible manufacturing tolerances, material deformation or wear after long-term operation, ensuring the long-term stable operation of the mechanism.

[0047] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A linear vibration mechanism based on a rotary motor and avoiding unnecessary force components, comprising a rotary motor (10), an eccentric wheel (40) and a counterweight (60), wherein the eccentric wheel (40) is fixedly connected to a motor shaft (11) of the rotary motor (10), a rectangular motion groove (62) for accommodating the eccentric wheel (40) is provided on a lower end surface of the counterweight (60), and the counterweight (60) is configured to be floatingly installed relative to the eccentric wheel (40), characterized in that: A round-headed rectangular hole (61) is provided in the middle of the bottom wall of the rectangular motion groove (62), the length direction of the round-headed rectangular hole (61) being orthogonal to the length direction of the rectangular motion groove (62), and the motor shaft (11) extends beyond the protrusion (111) of the eccentric wheel (40) and enters the round-headed rectangular hole (61) to form a transition fit or a clearance fit therewith.

2. A linear vibration mechanism based on a rotary motor and avoiding unnecessary force according to claim 1, characterized in that: The two long side surfaces (621) of the rectangular motion groove (62) are transitionally fitted or clearance-fitted with the eccentric wheel (40), and there is a gap between the bottom wall of the rectangular motion groove (62) and the top surface of the eccentric wheel (40).

3. A linear vibration mechanism based on a rotary motor and avoiding unnecessary force according to claim 1, characterized in that: A bearing (50) is disposed outside the eccentric wheel (40), two long side surfaces (621) of the rectangular motion groove (62) are transitionally fitted or clearance-fitted with the outer ring of the bearing (50), and a gap exists between the bottom wall of the rectangular motion groove (62) and the top surfaces of the bearing (50) and the eccentric wheel (40).

4. A linear vibration mechanism based on a rotary motor and avoiding unnecessary force according to claim 2 or 3, characterized in that: The length of the round-head rectangular hole (61) is greater than twice the eccentricity of the eccentric wheel.

5. A linear vibration mechanism based on a rotary motor and avoiding unnecessary force according to claim 3, characterized in that: The bearing (50) is a sliding bearing or a ball bearing.

6. A linear vibration mechanism based on a rotary motor and avoiding unnecessary force according to any one of claims 1 to 3, characterized in that: The counterweight block (60) is floatingly mounted on the rotary motor (10) via four spring sheets (20); the upper end of the spring sheet (20) is fixedly connected to the counterweight block (60), and the lower end is fixedly connected to the housing of the rotary motor (10); the swingable direction of the spring sheet (20) is consistent with the length direction of the round-headed rectangular hole (61).

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