Fascia gun

Abstract

The utility model relates to the technical field of massage instruments, and discloses a fascia gun, which comprises a driving mechanism provided with a driving shaft; the eccentric wheel comprises a main body and an eccentric shaft which are connected with each other, the main body is in transmission connection with the driving shaft, and the central axis of the eccentric shaft is parallel to the central axis of the driving shaft; the eccentric shaft is sleeved with an inner ring of the first bearing; one end of the metal elastic connecting rod is connected with an outer ring of the first bearing, the elastic modulus of the metal elastic connecting rod is larger than or equal to 190 GPa and smaller than or equal to 210 GPa, and the hardness of the metal elastic connecting rod is larger than or equal to 55 HRC and smaller than or equal to 62 HRC; the outer ring of the second bearing is connected with the other end of the metal elastic connecting rod; the transmission rod assembly comprises a transmission rod and a fixing shaft, the fixing shaft is inserted into an inner ring of the second bearing, one end of the transmission rod is connected with the fixing shaft, the other end of the transmission rod is connected with the massage head, and the transmission rod reciprocates in the length direction of the transmission rod. The fascia gun is high in massage comfort, good in holding hand feeling, low in cost and high in production efficiency and yield.

Description

Technical Field

[0001] This utility model relates to the field of massage instrument technology, specifically to a fascia gun. Background Technology

[0002] Fascia guns are commonly used fitness products. They can relax muscles, prevent muscle fibrosis and atrophy, relieve muscle strain, warm up quickly, assist in the treatment of myofascitis, promote muscle recovery, relieve fatigue and soreness, and relax muscle tension.

[0003] However, the massage impact of fascia guns in related technologies is rough, the massage effect is unsatisfactory, and the fascia guns vibrate a lot, resulting in a poor grip experience. In addition, fascia guns have high requirements for the processing and assembly precision of the moving parts, which reduces production efficiency, increases the defect rate, and leads to high costs. Utility Model Content

[0004] In view of this, the present invention provides a fascia gun to solve the problems of rough massage impact, severe vibration, and high requirements for the processing and assembly precision of the moving components.

[0005] This utility model provides a fascia gun, comprising: a drive mechanism with a drive shaft; an eccentric wheel including a body and an eccentric shaft, the body and the eccentric shaft being connected, the body and the drive shaft being drivenly connected, the central axis of the eccentric shaft being parallel to the central axis of the drive shaft; a first bearing, the inner ring of the first bearing being sleeved on the eccentric shaft; a metal elastic connecting rod, one end of the metal elastic connecting rod being connected to the outer ring of the first bearing, the elastic modulus of the metal elastic connecting rod being greater than or equal to 190 GPa and less than or equal to 210 GPa, and the hardness of the metal elastic connecting rod being greater than or equal to 55 HRC and less than or equal to 62 HRC; a second bearing, the outer ring of the second bearing being connected to the other end of the metal elastic connecting rod; and a transmission rod assembly including a transmission rod and a fixed shaft, the fixed shaft being inserted into the inner ring of the second bearing, one end of the transmission rod being connected to the fixed shaft, and the other end being used to connect to a massage head, wherein when the drive shaft of the drive mechanism rotates, it drives the transmission rod to reciprocate along the length direction of the transmission rod.

[0006] Beneficial Effects: This utility model of fascia gun uses a metal elastic link, replacing the rigid metal link in existing fascia guns. The metal elastic link is elastic and can undergo elastic deformation. When the massage head impacts the body, the impact reaction force is transmitted back to the metal elastic link. The metal elastic link undergoes elastic deformation to absorb the impact reaction force. During the recovery process from elastic deformation, the metal elastic link generates a rebound force, which is then transmitted to the massage head. This is equivalent to multiple impact massages on the body in one impact cycle. On the one hand, it adjusts the large single impact force of the massage head on the body to multiple small impact forces on the body, avoiding rough impacts and improving massage comfort. On the other hand, it reduces the impact reaction force exerted by the body on the fascia gun, effectively reducing the vibration of the fascia gun and improving grip comfort. In addition, since the metal elastic link can undergo elastic deformation, it can absorb machining and assembly tolerances through elastic deformation, thereby increasing the tolerance rate. Even if other components have certain misalignment deformations that cause stress, the metal elastic link can deform accordingly with the stress. Therefore, the machining accuracy and assembly accuracy of the moving components inside the fascia gun can be reduced accordingly, thereby improving production efficiency and yield, and reducing the overall cost of the machine.

[0007] In one alternative embodiment, the metal elastic link comprises spring steel.

[0008] Beneficial effects: It can ensure that the elastic modulus and hardness of the metal elastic connecting rod meet the requirements, and it is easy to process and manufacture.

[0009] In one alternative embodiment, the first bearing is welded to the metal elastic link; and / or, the second bearing is welded to the metal elastic link.

[0010] Beneficial effects: The connection between the first and second bearings and the metal elastic connecting rod is convenient and has high connection strength, which can effectively fix the relative position between the first and second bearings and the metal elastic connecting rod.

[0011] In one optional embodiment, the metal elastic link is provided with a first through hole, and the first bearing passes through the first through hole; and / or, the metal elastic link is provided with a second through hole, and the second bearing passes through the second through hole.

[0012] Beneficial effects: The large contact area between the first and second bearings and the metal elastic connecting rod facilitates welding of the first and second bearings to the metal elastic connecting rod, and increases the connection strength between the first and second bearings and the metal elastic connecting rod, thereby improving the reliability of the connection.

[0013] In one alternative embodiment, the diameter of the first bearing is larger than the diameter of the second bearing; and / or, the width of the metal elastic link gradually decreases from the first bearing to the second bearing; and / or, both ends of the metal elastic link in the length direction are arc surfaces.

[0014] Beneficial effects: It can adapt to the space on the side of the fascia gun close to the massage head, avoid interference between the metal elastic connecting rod and the shell, and also reduce costs and weight, which is conducive to the lightweighting and miniaturization of the fascia gun.

[0015] In one alternative embodiment, the length of the metal elastic link is greater than or equal to 30 mm and less than or equal to 70 mm.

[0016] Beneficial effects: On the one hand, it can ensure sufficient spacing between the drive mechanism and the transmission rod, avoiding interference between the drive mechanism and the transmission rod. On the other hand, the size of the fascia gun will not be too large, and the metal elastic connecting rod will not easily deform under the condition of no external force, thereby ensuring the reliability of the relative position between the first bearing and the second bearing, so that the fascia gun can work normally, and it is also conducive to the miniaturization of the fascia gun.

[0017] In one alternative embodiment, the thickness of the metal elastic link is greater than or equal to 0.8 mm and less than or equal to 1.2 mm.

[0018] Beneficial effects: By setting D to be no less than 0.8mm, the metal elastic link can be prevented from being too thin, reducing the probability of damage to the metal elastic link and preventing deformation of the metal elastic link when not subjected to external force, thus ensuring the reliability of the relative position between the first and second bearings; by setting D to be no more than 1.2mm, on the one hand, the stiffness of the metal elastic link can be prevented from being too large, ensuring that the metal elastic link can effectively deform elastically when the fascia gun massages the body, thereby improving massage comfort and reducing the vibration of the fascia gun.

[0019] In one optional embodiment, the distance between the outer peripheral surface of the metal elastic connecting rod and the outer peripheral surface of the first bearing is greater than or equal to 0.03 mm and less than or equal to 0.08 mm; and / or, the distance between the outer peripheral surface of the metal elastic connecting rod and the outer peripheral surface of the second bearing is greater than or equal to 0.03 mm and less than or equal to 0.08 mm.

[0020] Beneficial effects: When the drive mechanism rotates at high speed, it can prevent the portion of the metal elastic link located near the bearings (first bearing and second bearing) from being damaged by stress, reducing the probability of damage to the metal elastic link and ensuring the installation reliability of the bearings and the metal elastic link. Furthermore, it can prevent the metal elastic link from being too large, reducing material usage, lowering costs and weight, fully utilizing the space of the metal elastic link, and improving its space utilization rate.

[0021] In one alternative embodiment, the flatness of the metal elastic link is less than or equal to 0.01 mm.

[0022] Beneficial effects: It can prevent misalignment of the first and second bearings, improve the assembly accuracy between the first and second bearings and the metal elastic connecting rod, and ensure the working performance of the fascia gun.

[0023] In one alternative embodiment, the side of the first bearing facing the drive mechanism and the side of the second bearing facing the drive mechanism are flush in the thickness direction of the metal elastic link.

[0024] Beneficial effects: Easy positioning helps avoid misalignment of the first and second bearings, improves the assembly accuracy between the first and second bearings and the metal elastic connecting rod, and ensures the working performance of the fascia gun. Attached Figure Description

[0025] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 This is one of the structural schematic diagrams of the fascia gun according to an embodiment of the present utility model;

[0027] Figure 2 This is the second structural schematic diagram of the fascia gun according to an embodiment of the present utility model;

[0028] Figure 3 for Figure 2 Sectional view along line AA;

[0029] Figure 4 This is one of the schematic diagrams showing the cooperation between the metal elastic connecting rod, the first bearing, and the second bearing in an embodiment of this utility model;

[0030] Figure 5 This is a second schematic diagram showing the cooperation between the metal elastic connecting rod, the first bearing, and the second bearing in an embodiment of this utility model.

[0031] Figure 6 for Figure 5 Sectional view along line BB;

[0032] Figure 7 This is an exploded view of the metal elastic connecting rod, the first bearing, and the second bearing according to an embodiment of the present invention.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Fascia gun;

[0035] 100. Massage head;

[0036] 200. Drive mechanism; 210. Drive shaft;

[0037] 300. First bearing;

[0038] 400, Metal elastic connecting rod; 410, First through hole; 420, Second through hole;

[0039] 500, Second Bearing;

[0040] 600. Transmission rod assembly; 610. Transmission rod; 620. Fixed shaft;

[0041] 700, Eccentric wheel; 710, Main body; 720, Eccentric shaft. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0043] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0044] In the description of this utility model, "a plurality of" means two or more. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0045] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0046] In existing technology, fascia guns transmit force between the drive mechanism and the massage head via a rigid metal connecting rod. The drive mechanism and the massage head are rigidly connected, and the rigid metal connecting rod directly converts the rotational motion of the drive mechanism into linear motion, which is then transmitted to the massage head. The massage head performs cyclic impact massage on the body parts. The massage impact is rough, and the reaction force from the body parts is also directly transmitted to the fascia gun. The fascia gun vibrates a lot, resulting in a poor grip experience.

[0047] In addition, due to the existence of processing errors and assembly tolerances, the transmission rods may not fit properly, resulting in increased noise and shortened service life of the fascia gun. Therefore, fascia guns have high requirements for the processing and assembly accuracy of the moving components, which leads to high overall product cost.

[0048] The following is combined with Figures 1 to 7 The following describes embodiments of the present invention.

[0049] According to an embodiment of the present invention, a fascia gun 1 is provided. The fascia gun 1 includes a housing (not shown in the figure), a drive mechanism 200, an eccentric wheel 700, a first bearing 300, a metal elastic connecting rod 400, a second bearing 500, and a transmission rod assembly 600.

[0050] The drive mechanism 200, the first bearing 300, the metal elastic connecting rod 400, and the second bearing 500 are all housed in the housing. The drive mechanism 200 is provided with a drive shaft 210. The eccentric wheel 700 includes a main body 710 and an eccentric shaft 720. The main body 710 and the eccentric shaft 720 are connected. The main body 710 and the drive shaft 210 are connected in a transmission manner. The central axis of the eccentric shaft 720 and the central axis of the drive shaft 210 are arranged parallel to each other.

[0051] For example, the main body 710 may have a through hole 711, into which the drive shaft 210 is inserted. The cross-section of the through hole 711 and the cross-section of the drive shaft 210 are configured to be non-circular to avoid relative rotation between the main body 710 and the drive shaft 210, thus ensuring synchronous rotation between the main body 710 and the drive shaft 210. The drive mechanism 200 may be a motor, and the drive shaft 210 may be a motor shaft.

[0052] The inner ring of the first bearing 300 is fitted onto the eccentric shaft 720. One end of the metal elastic connecting rod 400 is connected to the first bearing 300. The elastic modulus of the metal elastic connecting rod 400 is greater than or equal to 190 GPa and less than or equal to 210 GPa. The hardness of the metal elastic connecting rod 400 is greater than or equal to 55 HRC and less than or equal to 62 HRC.

[0053] The outer ring of the second bearing 500 is connected to the other end of the metal elastic connecting rod 400. The transmission rod assembly 600 includes a transmission rod 610 and a fixed shaft 620. The fixed shaft 620 is inserted into the inner ring of the second bearing 500. One end of the transmission rod 610 is connected to the fixed shaft 620, and the other end extends out of the housing for connecting the massage head 100. When the drive shaft 210 of the drive mechanism 200 rotates, it drives the transmission rod 610 to reciprocate along the length of the transmission rod 610.

[0054] For example, the elastic modulus of the metal elastic link 400 can be determined using the test methods in GB / T 22315-200, such as the suspension-wire coupling resonance method. A constant-amplitude sinusoidal signal output from a signal generator is amplified and applied to an exciter, converting the electrical signal into mechanical vibration. This mechanical vibration is then transmitted to the sample of the metal elastic link 400 via a suspension wire, causing the sample to undergo forced lateral vibration. The suspension wire at the other end of the sample transmits the vibration to a pickup, where the mechanical vibration is again converted into an electrical signal. This signal is amplified and displayed on an oscilloscope. When the signal frequency of the signal generator equals the natural frequency of the link, the sample resonates, and the waveform amplitude on the oscilloscope suddenly increases. The frequency at this point is the resonant frequency. Then, by testing the sample's mass m, length l, average thickness h, and the resonant frequency value f of the bending vibration fundamental frequency and the correction factor T, the elastic modulus can be calculated using the following formula: E = 0.9465 × 10⁻⁶. -9 (l / h) 3 (m / b)f 2 T, where the correction factor T can be determined according to the table in GB / T 22315-200.

[0055] The hardness test method for the 400 metal elastic connecting rod can adopt the test method in GBT230.1-2018. For example, a diamond cone indenter is used. After the initial test force is applied, the initial indentation depth is measured. Then, the main test force is applied. After the main test force is removed, the final indentation depth h is measured while the initial test force is maintained. Rockwell hardness = 100 - h / S, where the scale value S is 0.002 mm, the initial test force is 98.07 N, and the main test force is 1.471 KN.

[0056] Specifically, the metal elastic link 400 comprises spring steel. The spring steel can be carbon tool steel, specifically T8 steel. Of course, the spring steel can also be other types of steel that meet the above requirements.

[0057] In addition, the fascia gun 1 may also include a speaker, a camera, a mainboard, a battery, and a switch button. The speaker, camera, mainboard, and drive mechanism 200 are all connected to the battery, which is housed inside the casing and supplies power to the electrical components of the fascia gun 1. The mainboard is connected to the speaker, camera, switch button, and drive mechanism 200. Pressing the switch button inputs a switch signal to the mainboard to control the start and stop of the drive mechanism 200. The speaker is used to play information to remind users of the usage status of the fascia gun 1, and the camera can monitor the massage position.

[0058] The fascia gun 1 of this invention uses a metal elastic link 400, replacing the rigid metal link in existing fascia guns. The metal elastic link 400 is elastic and can undergo elastic deformation. When the massage head 100 impacts the body, the impact reaction force is transmitted back to the metal elastic link 400. The metal elastic link 400 undergoes elastic deformation to absorb the impact reaction force. During the recovery process from elastic deformation, the metal elastic link 400 generates a rebound force, which is then transmitted to the massage head 100. This is equivalent to multiple impact massages on the body in one impact cycle. On the one hand, it adjusts the large single impact force of the massage head 100 on the body to multiple small impact forces on the body, avoiding rough impacts and improving massage comfort. On the other hand, it reduces the impact reaction force exerted by the body on the fascia gun 1, effectively reducing the vibration of the fascia gun 1 and improving grip comfort.

[0059] In addition, since the metal elastic link 400 can undergo elastic deformation, it can absorb machining and assembly tolerances through elastic deformation, thereby increasing the tolerance rate. Even if other components have certain misalignment deformation that causes stress, the metal elastic link 400 can deform accordingly with the stress. Therefore, the machining accuracy and assembly accuracy of the motion components in the fascia gun 1 can be reduced accordingly, thereby improving production efficiency and yield, and reducing the overall cost of the machine.

[0060] When the elastic modulus of the metal elastic link 400 is less than 190 GPa, the deformation amplitude of the metal elastic link 400 under force is small, which is not conducive to absorbing the impact reaction force of the fascia gun 1 and the massage comfort is low; when the elastic modulus of the metal elastic link 400 is greater than 210 GPa, the deformation amplitude of the metal elastic link 400 under force is large, and it is difficult to ensure the installation reliability of the metal elastic link 400.

[0061] In this invention, by setting the elastic modulus of the metal elastic link 400 to be not less than 190 GPa, it is possible to ensure that the metal elastic link 400 can undergo sufficient elastic deformation, so that the driving force between the massage head 100 and the drive mechanism 200 is elastic transmission rather than rigid transmission; and the elastic modulus of the metal elastic link 400 is not greater than 210 GPa, which can prevent the metal elastic link 400 from undergoing excessive elastic deformation when subjected to force, thus ensuring the massage effect.

[0062] Furthermore, when the hardness of the metal elastic link 400 is less than 55 HRC, its low hardness makes it susceptible to damage under stress. By setting the hardness of the metal elastic link 400 to be no less than 55 HRC, sufficient hardness is achieved, preventing damage from external forces. Setting the hardness of the metal elastic link 400 to be no greater than 62 HRC reduces costs.

[0063] In some embodiments, the first bearing 300 is welded to the metal elastic link 400, or the second bearing 500 is welded to the metal elastic link 400, or the first bearing 300 is welded to the metal elastic link 400 and the second bearing 500 is welded to the metal elastic link 400.

[0064] Specifically, the outer ring of the first bearing 300 is welded to the metal elastic connecting rod 400, and the outer ring of the second bearing 500 is welded to the metal elastic connecting rod 400.

[0065] In this way, the connection between the first bearing 300 and the metal elastic connecting rod 400 is convenient and has high connection strength, effectively fixing the relative position between the first bearing 300 and the metal elastic connecting rod 400. Similarly, the connection between the second bearing 500 and the metal elastic connecting rod 400 is convenient and has high connection strength, effectively fixing the relative position between the second bearing 500 and the metal elastic connecting rod 400.

[0066] like Figure 7 As shown, in some embodiments, the metal elastic link 400 is provided with a first through hole 410, and the first bearing 300 passes through the first through hole 410; or the metal elastic link 400 is provided with a second through hole 420, and the second bearing 500 passes through the second through hole 420; or, the metal elastic link 400 is provided with a first through hole 410 and a second through hole 420, the first bearing 300 passes through the first through hole 410, and the second bearing 500 passes through the second through hole 420.

[0067] In this way, the contact area between the first bearing 300 and the second bearing 500 and the metal elastic connecting rod 400 is large. On the one hand, this facilitates the welding of the first bearing 300 and the second bearing 500 to the metal elastic connecting rod 400. On the other hand, it can increase the connection strength between the first bearing 300 and the second bearing 500 and the metal elastic connecting rod 400, and improve the connection reliability of the first bearing 300 and the second bearing 500 to the metal elastic connecting rod 400.

[0068] Furthermore, the first bearing 300 and the metal elastic connecting rod 400 can be laser welded together. The two opposite sides of the metal elastic connecting rod 400 in the thickness direction are welded to the first bearing 300 to improve the connection strength between the first bearing 300 and the metal elastic connecting rod 400 and ensure the relative positional stability between the first bearing 300 and the metal elastic connecting rod 400.

[0069] The second bearing 500 and the metal elastic connecting rod 400 can be laser welded together. The two opposite sides of the metal elastic connecting rod 400 in the thickness direction are welded to the second bearing 500 to improve the connection strength between the second bearing 500 and the metal elastic connecting rod 400 and ensure the relative positional stability between the second bearing 500 and the metal elastic connecting rod 400.

[0070] like Figures 1-7 As shown, in some embodiments, the diameter of the first bearing 300 is larger than the diameter of the second bearing 500.

[0071] Since the first bearing 300 is connected to the drive mechanism 200 and the second bearing 500 is connected to the transmission rod assembly 600, the second bearing 500 is closer to the massage head 100 of the fascia gun 1 than the first bearing 300. In order to facilitate the use of the fascia gun 1, the space on the side of the fascia gun 1 closest to the massage head 100 is usually reduced. Under the condition that the requirements are met, by setting the diameter of the first bearing 300 to be larger than the diameter of the second bearing 500, it is possible to accommodate the space on the side of the fascia gun 1 closest to the massage head 100 and avoid interference between the second bearing 500 and the objects inside the housing.

[0072] Furthermore, the width of the metal elastic link 400 gradually decreases from the first bearing 300 to the second bearing 500. This allows the width of the metal elastic link 400 to simultaneously adapt to the diameters of the first bearing 300 and the second bearing 500, ensuring the reliability of the connection between the first bearing 300, the second bearing 500, and the metal elastic link 400. It also reduces the size of the side of the metal elastic link 400 closest to the massage head 100, preventing interference between the metal elastic link 400 and the housing. Additionally, it reduces cost and weight, contributing to the lightweighting and miniaturization of the fascia gun 1.

[0073] Furthermore, both ends of the metal elastic link 400 along its length are curved surfaces. This ensures that the outer circumference of the metal elastic link 400 is smooth and free of sharp edges, guaranteeing uniform force distribution, reducing the probability of localized stress concentration, preventing damage due to excessive localized stress, and extending the service life of the metal elastic link 400.

[0074] like Figure 5As shown, in some embodiments, the length L of the metal elastic link 400 is greater than or equal to 30 mm and less than or equal to 70 mm. The length L of the metal elastic link 400 can be either 30 mm or 70 mm.

[0075] When the length of the metal elastic link 400 is less than 30mm, the distance between the first bearing 300 and the second bearing 500 is too small, resulting in the distance between the drive mechanism 200 and the transmission rod assembly 600 being too close. When the drive mechanism 200 drives the massage head 100 to move, interference may occur between the drive mechanism 200 and the transmission rod assembly 600. When the length of the metal elastic link 400 is greater than 70mm, the length of the metal elastic link 400 is too long. On the one hand, this will result in the fascia gun 1 being too large, making it inconvenient to use, carry, and store. On the other hand, the metal elastic link 400 has a large lever arm in its length direction, making it easy to deform under force and causing misalignment between the first bearing 300 and the second bearing 500.

[0076] By setting the length L of the metal elastic link 400 to be no less than 30mm and no more than 70mm, on the one hand, it can ensure that the distance between the drive mechanism 200 and the transmission rod assembly 600 is sufficient, avoiding interference between the drive mechanism 200 and the transmission rod assembly 600. On the other hand, the size of the fascia gun 1 will not be too large, so that the metal elastic link 400 is not easily deformed when not subjected to external force, thereby ensuring the reliability of the relative position between the first bearing 300 and the second bearing 500, so that the fascia gun 1 can work normally. Moreover, the size of the fascia gun 1 is reduced, which is conducive to the miniaturization of the fascia gun 1, making it easier to use, carry and place.

[0077] like Figure 6 As shown, in some embodiments, the thickness D of the metal elastic link 400 is greater than or equal to 0.8 mm and less than or equal to 1.2 mm. The thickness of the metal elastic link 400 can be either 0.8 mm or 1.2 mm.

[0078] When the thickness D of the metal elastic link 400 is less than 0.8mm, the metal elastic link 400 is too thin, the structural strength is low, and it is easy to be damaged or even broken under force; when the thickness D of the metal elastic link 400 is greater than 1.2mm, the metal elastic link 400 is too thick, which is not conducive to the elastic deformation of the metal elastic link 400 under force, and it is difficult to ensure massage comfort.

[0079] By setting the thickness D of the metal elastic link 400 to be no less than 0.8mm, it is possible to avoid the metal elastic link 400 being too thin, reduce the probability of damage to the metal elastic link 400, and prevent the metal elastic link 400 from deforming under no external force due to excessively low stiffness. This ensures the reliability of the relative position between the first bearing 300 and the second bearing 500, and improves the massage comfort of the fascia gun 1.

[0080] By setting the thickness D of the metal elastic link 400 to no more than 1.2mm, it is possible to avoid excessive stiffness of the metal elastic link 400. When the fascia gun 1 massages the body, it can ensure that the metal elastic link 400 can undergo effective elastic deformation to improve massage comfort and reduce vibration of the fascia gun 1. It can also reduce the volume of the metal elastic link 400 and reduce the probability of interference between the parts of the fascia gun 1.

[0081] like Figure 5 As shown, in some embodiments, the distance H1 between the outer peripheral surface of the metal elastic connecting rod 400 and the outer peripheral surface of the first bearing 300 is greater than or equal to 0.03 mm and less than or equal to 0.08 mm. The distance H1 between the outer peripheral surface of the metal elastic connecting rod 400 and the outer peripheral surface of the first bearing 300 can be 0.03 mm or 0.08 mm.

[0082] When H1 is less than 0.03mm, the edge of the first through hole 410 is small and easily damaged by force. When H1 is greater than 0.08mm, the edge of the first through hole 410 is large, and the space of the metal elastic connecting rod 400 is not effectively utilized, which increases the cost.

[0083] By setting the distance H1 between the outer peripheral surface of the metal elastic link 400 and the outer peripheral surface of the first bearing 300 to be not less than 0.03mm, when the drive mechanism 200 rotates at high speed, the part of the metal elastic link 400 located near the first bearing 300 can be prevented from being damaged by force, reducing the probability of damage to the metal elastic link 400 and ensuring the installation reliability between the first bearing 300 and the metal elastic link 400.

[0084] By setting the distance H1 between the outer peripheral surface of the metal elastic link 400 and the outer peripheral surface of the first bearing 300 to be no greater than 0.03mm, the size of the metal elastic link 400 can be avoided from being too large, reducing the amount of material used, lowering the cost and weight, and making full use of the space of the metal elastic link 400, thus improving the space utilization rate of the metal elastic link 400.

[0085] like Figure 5 As shown, in some embodiments, the distance H2 between the outer peripheral surface of the metal elastic connecting rod 400 and the outer peripheral surface of the second bearing 500 is greater than or equal to 0.03 mm and less than or equal to 0.08 mm. Specifically, the distance H2 between the outer peripheral surface of the metal elastic connecting rod 400 and the outer peripheral surface of the second bearing 500 can be 0.03 mm or 0.08 mm.

[0086] When H2 is less than 0.03mm, the edge of the second through hole 420 is small and easily damaged by force. When H2 is greater than 0.08mm, the edge of the second through hole 420 is large, and the space of the metal elastic connecting rod 400 is not effectively utilized, which increases the cost.

[0087] By setting the distance H2 between the outer peripheral surface of the metal elastic link 400 and the outer peripheral surface of the second bearing 500 to be not less than 0.03mm, when the drive mechanism 200 rotates at high speed, the part of the metal elastic link 400 located near the second bearing 500 can be prevented from being damaged by force, reducing the probability of damage to the metal elastic link 400 and ensuring the installation reliability between the second bearing 500 and the metal elastic link 400.

[0088] By setting the distance H1 between the outer peripheral surface of the metal elastic link 400 and the outer peripheral surface of the second bearing 500 to be no greater than 0.03mm, the size of the metal elastic link 400 can be avoided from being too large, reducing the amount of material used, lowering costs and weight, and making full use of the space of the metal elastic link 400, thus improving the space utilization rate of the metal elastic link 400.

[0089] In some embodiments, the flatness of the metal elastic link 400 is less than or equal to 0.01 mm. When the flatness of the metal elastic link 400 is greater than 0.01 mm, the flatness of the metal elastic link 400 is poor, which can easily lead to misalignment of the first bearing 300 and the second bearing 500, resulting in a large vibration amplitude of the metal elastic link 400. By setting the flatness of the metal elastic link 400 to be less than or equal to 0.01 mm, misalignment of the first bearing 300 and the second bearing 500 can be avoided, improving the assembly accuracy between the first bearing 300, the second bearing 500, and the metal elastic link 400, and ensuring the working performance of the fascia gun 1.

[0090] like Figure 6 As shown, in some embodiments, the side of the first bearing 300 facing the drive mechanism 200 and the side of the second bearing 500 facing the drive mechanism 200 are flush in the thickness direction of the metal elastic link 400.

[0091] This facilitates positioning the relative positions of the first bearing 300 and the second bearing 500, helps avoid misalignment of the first bearing 300 and the second bearing 500, improves the assembly accuracy between the first bearing 300, the second bearing 500 and the metal elastic connecting rod 400, and ensures the working performance of the fascia gun 1.

[0092] The assembly process of the metal elastic connecting rod 400, the first bearing 300, and the second bearing 500 of the fascia gun 1 is as follows:

[0093] First, the spring steel is stamped into sheet metal. After stamping, the spring steel is heat-treated. After heat treatment, the elasticity and rigidity of the spring steel are improved, and the hardness of the spring steel can reach about 60 HRC. This sheet-shaped spring steel is used as a metal elastic connecting rod 400.

[0094] Then, the first bearing 300, the second bearing 500, and the spring steel are placed in a welding fixture, and the outer ring of the first bearing 300, the outer ring of the second bearing 500, and the inner circumferential surfaces of the first through hole 410 and the second through hole 2 of the spring steel are welded together by laser welding.

[0095] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A fascia gun, characterized in that, include: The drive mechanism (200) is provided with a drive shaft (210); An eccentric wheel (700) includes a body (710) and an eccentric shaft (720). The body (710) and the eccentric shaft (720) are connected. The body (710) and the drive shaft (210) are connected in a driving relationship. The central axis of the eccentric shaft (720) and the central axis of the drive shaft (210) are arranged parallel to each other. A first bearing (300) has its inner ring fitted onto the eccentric shaft (720). A metal elastic link (400), one end of which is connected to the outer ring of the first bearing (300), the elastic modulus of which is greater than or equal to 190 GPa and less than or equal to 210 GPa, and the hardness of which is greater than or equal to 55 HRC and less than or equal to 62 HRC. The outer ring of the second bearing (500) is connected to the other end of the metal elastic connecting rod (400); The transmission rod assembly (600) includes a transmission rod (610) and a fixed shaft (620). The fixed shaft (620) is inserted into the inner ring of the second bearing (500). One end of the transmission rod (610) is connected to the fixed shaft (620), and the other end is used to connect to the massage head (100). When the drive shaft (210) of the drive mechanism (200) rotates, it drives the transmission rod (610) to reciprocate along the length direction of the transmission rod (610).

2. The fascia gun according to claim 1, characterized in that, The metal elastic link (400) comprises spring steel.

3. The fascia gun according to claim 2, characterized in that, The first bearing (300) is welded to the metal elastic connecting rod (400); And / or, the second bearing (500) is welded to the metal elastic connecting rod (400).

4. The fascia gun according to claim 1, characterized in that, The metal elastic connecting rod (400) is provided with a first through hole (410), and the first bearing (300) passes through the first through hole (410); And / or, the metal elastic link (400) is provided with a second through hole (420), and the second bearing (500) passes through the second through hole (420).

5. The fascia gun according to claim 1, characterized in that, The diameter of the first bearing (300) is larger than the diameter of the second bearing (500); And / or, in the direction from the first bearing (300) to the second bearing (500), the width of the metal elastic link (400) gradually decreases; And / or, both ends of the metal elastic link (400) in the length direction are arc surfaces.

6. The fascia gun according to any one of claims 1-5, characterized in that, The length of the metal elastic link (400) is greater than or equal to 30 mm and less than or equal to 70 mm.

7. The fascia gun according to any one of claims 1-5, characterized in that, The thickness of the metal elastic link (400) is greater than or equal to 0.8 mm and less than or equal to 1.2 mm.

8. The fascia gun according to claim 1, characterized in that, The distance between the outer peripheral surface of the metal elastic connecting rod (400) and the outer peripheral surface of the first bearing (300) is greater than or equal to 0.03 mm and less than or equal to 0.08 mm; And / or, the distance between the outer peripheral surface of the metal elastic connecting rod (400) and the outer peripheral surface of the second bearing (500) is greater than or equal to 0.03 mm and less than or equal to 0.08 mm.

9. The fascia gun according to any one of claims 1-5, characterized in that, The flatness of the metal elastic link (400) is less than or equal to 0.01 mm.

10. The fascia gun according to any one of claims 1-5, characterized in that, In the thickness direction of the metal elastic link (400), the side of the first bearing (300) facing the drive mechanism (200) and the side of the second bearing (500) facing the drive mechanism (200) are flush.

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