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 plastic elastic connecting rod is connected with an outer ring of the first bearing, the elastic modulus of the plastic elastic connecting rod is larger than or equal to 6 GPa and smaller than or equal to 15 GPa, and the Rockwell hardness of the plastic elastic connecting rod is larger than or equal to R120; the outer ring of the second bearing is connected with the other end of the plastic 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 used for being connected with the massage head, and the transmission rod reciprocates in the length direction. 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 plastic elastic connecting rod, one end of the plastic elastic connecting rod being connected to the outer ring of the first bearing, the elastic modulus of the plastic elastic connecting rod being greater than or equal to 6 GPa and less than or equal to 15 GPa, and the Rockwell hardness of the plastic elastic connecting rod being greater than or equal to R120; a second bearing, the outer ring of the second bearing being connected to the other end of the plastic 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 plastic elastic connecting rod, replacing the rigid metal connecting rod in existing fascia guns. The plastic elastic connecting rod is elastic and can undergo elastic deformation. When the massage head impacts the body, the impact reaction force is transmitted back to the plastic elastic connecting rod. The plastic elastic connecting rod undergoes elastic deformation to absorb the impact reaction force. During the recovery process from elastic deformation, the plastic elastic connecting rod 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 plastic elastic link can undergo elastic deformation, it can absorb processing and assembly tolerances through elastic deformation, thereby increasing the tolerance rate. Even if other parts have certain misalignment deformation that causes stress, the plastic elastic link can also deform accordingly with the stress. Therefore, the processing accuracy and assembly accuracy of the moving components in the fascia gun can be reduced accordingly, thereby improving production efficiency and yield, and reducing the overall cost of the machine.

[0007] In one optional embodiment, the plastic elastic link comprises polyhexamethylene adipamide and 20%–30% glass fiber material; or, the plastic elastic link comprises nylon plastic polyamide 6 and 20%–30% glass fiber material; or, the plastic elastic link comprises polybutylene terephthalate and 20%–30% glass fiber material; or, the plastic elastic link comprises polyethylene terephthalate and 20%–30% glass fiber material; or, the plastic elastic link comprises polyphenylene sulfide and 30%–40% glass fiber material; or, the plastic elastic link comprises polycarbonate and 20%–30% glass fiber material.

[0008] Beneficial effects: It can keep the plastic elastic connecting rods in line with requirements, and has multiple manufacturing methods and a more flexible structure.

[0009] In one optional embodiment, the plastic elastic connecting rod is provided with a first through hole and a second through hole, and the fascia gun further includes a first bearing seat and a second bearing seat, the first bearing seat being disposed in the first through hole and sleeved on the first bearing, and the second bearing seat being disposed in the second through hole and sleeved on the second bearing.

[0010] Beneficial effects: By setting a first bearing housing and a second bearing housing, with the first bearing housing fitted onto the first bearing and the second bearing housing fitted onto the second bearing, the positioning reliability between the first and second bearings and the plastic elastic connecting rod can be improved.

[0011] In one alternative embodiment, the first bearing housing and the plastic elastic connecting rod are injection molded as an integral structure; and / or, the second bearing housing and the plastic elastic connecting rod are injection molded as an integral structure.

[0012] Beneficial effects: Further improves the positioning reliability between the first and second bearings and the plastic elastic connecting rod.

[0013] In one optional embodiment, the inner circumferential surface of the first through hole is provided with a first groove, the outer circumferential surface of the first bearing seat is provided with a first outer ring, and the first outer ring is disposed in the first groove; and / or, the inner circumferential surface of the second through hole is provided with a second groove, the outer circumferential surface of the second bearing seat is provided with a second outer ring, and the second outer ring is disposed in the second groove.

[0014] Beneficial effects: On the one hand, it can increase the contact area between the first bearing housing and the plastic elastic connecting rod, and improve the relative positional stability between the first bearing housing and the plastic elastic connecting rod. On the other hand, it can position the first bearing housing and the plastic elastic connecting rod in the axial direction of the first bearing housing, effectively preventing the relative position of the first bearing housing and the plastic elastic connecting rod.

[0015] In one optional embodiment, one of the first outer ring and the plastic elastic connecting rod is provided with a first positioning hole and the other is provided with a first protrusion, the first protrusion being inserted into the first positioning hole; and / or, one of the second outer ring and the plastic elastic connecting rod is provided with a second positioning hole and the other is provided with a second protrusion, the second protrusion being inserted into the second positioning hole.

[0016] Beneficial effects: It can prevent the first and second bearing seats from rotating relative to the plastic elastic connecting rod, and it can also increase the contact area between the first and second bearing seats and the plastic elastic connecting rod, which is conducive to improving the connection strength between the first and second bearing seats and the plastic elastic connecting rod, thereby improving the positioning accuracy between the first and second bearing seats and the plastic elastic connecting rod.

[0017] In one optional embodiment, the first positioning hole is disposed on the first outer ring and extends through the edge of the first outer ring; and / or, the second positioning hole is disposed on the second outer ring and extends through the edge of the second outer ring; and / or, there are multiple first positioning holes, and the multiple first positioning holes are spaced apart circumferentially along the first bearing; and / or, there are multiple second positioning holes, and the multiple second positioning holes are spaced apart circumferentially along the second bearing.

[0018] Beneficial effects: The contact area between the first and second bearing housings and the plastic elastic connecting rod is larger, and a multi-point positioning fit is formed, which can further improve the positioning reliability between the plastic elastic connecting rod and the first and second bearing housings.

[0019] In one optional embodiment, the first positioning hole is disposed on the first outer ring, and the first outer ring further includes a third positioning hole, the third positioning hole being connected to the end of the first positioning hole near the first bearing, the maximum width of the third positioning hole being greater than the maximum width of the first positioning hole, and the plastic elastic connecting rod further having a third protrusion cooperating with the third positioning hole; and / or, the second positioning hole is disposed on the second outer ring, the second outer ring further includes a fourth positioning hole, the fourth positioning hole being connected to the end of the second positioning hole near the second bearing, the maximum width of the fourth positioning hole being greater than the maximum width of the second positioning hole, and the plastic elastic connecting rod further having a fourth protrusion cooperating with the fourth positioning hole.

[0020] Beneficial effects: It can not only increase the contact area between the first bearing housing and the second bearing housing and the plastic elastic connecting rod, and improve the connection strength between the first bearing housing and the second bearing housing and the plastic elastic connecting rod, but also limit the relative position of the first bearing housing and the second bearing housing and the plastic elastic connecting rod in the radial direction of the bearing housing.

[0021] In one optional embodiment, the inner circumferential surface of the first bearing housing is provided with a first inner ring, and the first bearing abuts against the first inner ring; and / or, the inner circumferential surface of the second bearing housing is provided with a second inner ring, and the second bearing abuts against the second inner ring.

[0022] Beneficial effects: The first inner ring defines the relative position between the first bearing housing and the first bearing, ensuring the first bearing is properly installed and improving positioning accuracy. The second inner ring defines the relative position between the second bearing housing and the second bearing, ensuring the second bearing is properly installed and improving positioning accuracy.

[0023] In one optional embodiment, the plastic elastic link has a weight-reducing groove on at least one side in its thickness direction, and a reinforcing rib is provided in the weight-reducing groove; and / or, the plastic elastic link includes a first thickness segment, a transition segment, and a second thickness segment, the first thickness segment being connected to the first bearing, the second thickness segment being connected to the second bearing, the thickness of the second thickness segment being less than the thickness of the first thickness segment, the transition segment being connected to both the first thickness segment and the second thickness segment, and the thickness of the transition segment gradually decreasing from the first thickness segment to the second thickness segment.

[0024] Beneficial effects: The weight-reducing groove reduces the weight of the plastic elastic connecting rod, which is beneficial for the lightweighting and miniaturization of the fascia gun. The reinforcing ribs increase the structural strength of the plastic elastic connecting rod, preventing excessive deformation that could lead to misalignment between the first and second bearings, thus ensuring the massage effect. By setting the thickness of the second thickness segment to be less than that of the first thickness segment, while ensuring the axial dimension matching between the second thickness segment and the second bearing, it can accommodate the space on the side of the fascia gun near the massage head, avoiding interference between the plastic elastic connecting rod and the housing. Furthermore, it reduces cost and weight, contributing to the lightweighting and miniaturization 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 A sectional view along line AA.

[0029] Figure 4 This is one of the schematic diagrams showing the fit of the plastic elastic connecting rod, the first bearing, the second bearing, the first bearing seat, and the second bearing seat in an embodiment of this utility model.

[0030] Figure 5 This is a second schematic diagram showing the fit of the plastic elastic connecting rod, the first bearing, the second bearing, the first bearing seat, and the second bearing seat according to an embodiment of this utility model.

[0031] Figure 6 This is the third schematic diagram showing the fit of the plastic elastic connecting rod, the first bearing, the second bearing, the first bearing seat, and the second bearing seat according to an embodiment of this utility model.

[0032] Figure 7 for Figure 6 Sectional view along line BB;

[0033] Figure 8 This is an exploded view of the plastic elastic connecting rod, the first bearing, the second bearing, the first bearing housing, and the second bearing housing according to an embodiment of this utility model.

[0034] Explanation of reference numerals in the attached figures:

[0035] 1. Fascia gun;

[0036] 100. Massage head;

[0037] 200. Drive mechanism; 210. Drive shaft;

[0038] 300. First bearing;

[0039] 400. Plastic elastic connecting rod; 410. First through hole; 411. First groove; 420. Second through hole; 421. Second groove; 430. First protrusion; 440. Second protrusion; 450. Third protrusion; 460. Fourth protrusion; 470. Weight reduction groove; 471. Reinforcing rib; 481. First thickness section; 482. Transition section; 483. Second thickness section;

[0040] 500, Second Bearing;

[0041] 600. Transmission rod assembly; 610. Transmission rod; 620. Fixed shaft;

[0042] 700, First bearing housing; 710, First outer ring; 711, First positioning hole; 712, Third positioning hole; 720, First inner ring;

[0043] 800, Second bearing housing; 810, Second outer ring; 811, Second positioning hole; 812, Fourth positioning hole; 820, Second inner ring;

[0044] 900, Eccentric wheel; 910, Main body; 920, Eccentric shaft. Detailed Implementation

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] The following is combined Figures 1 to 8 The following describes embodiments of the present invention.

[0052] 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 900, a first bearing 300, a plastic elastic connecting rod 400, a second bearing 500, and a transmission rod assembly 600.

[0053] The drive mechanism 200, the first bearing 300, the plastic elastic connecting rod 400, and the second bearing 500 are all housed within the housing. The drive mechanism 200 is equipped with a drive shaft 210. The eccentric wheel 900 includes a main body 910 and an eccentric shaft 920. The main body 910 and the eccentric shaft 920 are connected, and the main body 910 and the drive shaft 210 are connected in a transmission manner. The central axis of the eccentric shaft 920 is parallel to the central axis of the drive shaft 210, meaning that the central axis of the eccentric shaft 920 and the central axis of the drive shaft 210 do not coincide.

[0054] For example, the main body 910 may have a through hole 911, and the drive shaft 210 is inserted into the through hole 911. The cross-section of the through hole 911 and the cross-section of the drive shaft 210 are configured to be non-circular to avoid relative rotation between the main body 910 and the drive shaft 210, and to ensure that the main body 910 and the drive shaft 210 rotate synchronously. The drive mechanism 200 may be a motor.

[0055] The inner ring of the first bearing 300 is fitted onto the eccentric shaft 920. One end of the plastic elastic connecting rod 400 is connected to the outer ring of the first bearing 300. The elastic modulus of the plastic elastic connecting rod 400 is greater than or equal to 6 GPa and less than or equal to 15 GPa, and the Rockwell hardness of the plastic elastic connecting rod 400 is greater than or equal to R120. The outer ring of the second bearing 500 is connected to the other end of the plastic 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.

[0056] Specifically, the plastic materials can be polyadiohexylenediamine Nylon-66 (Nylon 66) with 20%–30% glass fiber, nylon plastic polyamide 6 (PA6) with 20%–30% glass fiber, polybutylene terephthalate (PBT) with 20%–30% glass fiber, polyethylene glycol terephthalate (PET) with 20%–30% glass fiber, polyphenylene sulfide (PPS) with 30%–40% glass fiber, or polycarbonate (PC) with 20%–30% glass fiber, etc.

[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 plastic elastic connecting rod 400, replacing the rigid metal connecting rod in existing fascia guns. The plastic elastic connecting rod 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 plastic elastic connecting rod 400. The plastic elastic connecting rod 400 undergoes elastic deformation to absorb the impact reaction force. During the recovery process from elastic deformation, the plastic elastic connecting rod 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 plastic elastic link 400 can undergo elastic deformation, it can absorb processing and assembly tolerances through elastic deformation, thereby increasing the tolerance rate. Even if other parts have certain misalignment deformation that causes stress, the plastic elastic link 400 can deform accordingly with the stress. Therefore, the processing 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] In some embodiments, the elastic modulus of the plastic elastic link 400 is greater than or equal to 6 GPa and less than or equal to 15 GPa, and the Rockwell hardness of the plastic material is greater than or equal to R120. The elastic modulus of the plastic material can be either 6 GPa or 15 GPa.

[0061] The elastic modulus of the plastic elastic connecting rod 400 can be tested using the method specified in ISO 178. The Rockwell hardness of the plastic material can be tested using the method specified in ISO 2039-2.

[0062] The elastic modulus of the plastic elastic link 400 is less than 6 GPa, resulting in a small elastic deformation range. This makes it unable to effectively absorb the impact force of the massage head 100, still leading to excessive single-impact force, poor massage comfort, and a subpar grip. Conversely, when the elastic modulus of the plastic elastic link 400 is greater than 15 GPa, its elastic deformation under stress is large, making it difficult to guarantee the installation stability of the plastic elastic link 400.

[0063] By setting the elastic modulus of the plastic elastic link 400 to be no less than 6 GPa, it can be ensured that the plastic 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, thus ensuring massage and grip comfort. Furthermore, the elastic modulus of the plastic elastic link 400 is no greater than 15 GPa, which can prevent the plastic elastic link 400 from undergoing excessive elastic deformation under force, ensuring the massage effect and high installation stability.

[0064] Furthermore, when the Rockwell hardness of the plastic elastic link 400 is less than R120, the structural strength of the plastic elastic link 400 is low, making it prone to deformation or even damage under stress. By setting the Rockwell hardness of the plastic elastic link 400 to be no less than R120, the plastic elastic link 400 has sufficient hardness, which can prevent the plastic elastic link 400 from being deformed or damaged by external forces.

[0065] like Figure 7 and Figure 8 As shown, in some embodiments, the plastic elastic connecting rod 400 is provided with a first through hole 410 and a second through hole 420. The fascia gun 1 also includes a first bearing seat 700 and a second bearing seat 800. The first bearing seat 700 is disposed in the first through hole 410 and sleeved on the first bearing 300, and the second bearing seat 800 is disposed in the second through hole 420 and sleeved on the second bearing 500. The first bearing seat 700 and the second bearing seat 800 can be formed by stamping aluminum alloy sheets, which can effectively reduce the cost of the first bearing seat 700 and the second bearing seat 800.

[0066] For example, the first bearing housing 700 and the first bearing 300 are in an interference fit. An assembly fixture is used to press the first bearing 300 onto the first bearing housing 700. The interference between the first bearing housing 700 and the first bearing 300 is greater than or equal to 0.005 mm and less than or equal to 0.01 mm. Similarly, the second bearing housing 800 and the second bearing 500 are in an interference fit. An assembly fixture is used to press the second bearing 500 onto the second bearing housing 800. The interference between the second bearing housing 800 and the second bearing 500 is greater than or equal to 0.005 mm and less than or equal to 0.01 mm.

[0067] Since the first bearing 300 and the second bearing 500 are standard parts, and the outer peripheral surfaces of the first bearing 300 and the second bearing 500 are relatively smooth, directly fitting the first bearing 300 and the second bearing 500 with the plastic elastic connecting rod 400 would easily cause them to separate from the plastic elastic connecting rod 400 when the drive shaft 210 of the drive mechanism 200 rotates at high speed. Therefore, by setting a first bearing seat 700 and a second bearing seat 800, with the first bearing seat 700 fitted onto the first bearing 300 and the second bearing seat 800 fitted onto the second bearing 500, the positioning reliability between the first bearing 300 and the second bearing 500 and the plastic elastic connecting rod 400 can be improved.

[0068] Specifically, the first bearing housing 700 and the plastic elastic connecting rod 400 are injection molded into an integral structure, or the second bearing housing 800 and the plastic elastic connecting rod 400 are injection molded into an integral structure, or the first bearing housing 700 and the plastic elastic connecting rod 400 are injection molded into an integral structure, and the second bearing housing 800 and the plastic elastic connecting rod 400 are injection molded into an integral structure.

[0069] In this way, the connection strength between the first bearing housing 700, the second bearing housing 800, and the plastic elastic connecting rod 400 is high, which helps to ensure the reliability of the relative positions of the first bearing housing 700, the second bearing housing 800, and the plastic elastic connecting rod 400. In addition, in the thickness direction of the plastic elastic connecting rod 400, the first bearing housing 700 does not extend beyond the opposite two sides of the plastic elastic connecting rod 400, and the second bearing housing 800 does not extend beyond the opposite two sides of the plastic elastic connecting rod 400. This increases the contact area between the first bearing housing 700 and the second bearing housing 800 and the plastic elastic connecting rod 400, improves the connection strength, and increases the positioning reliability.

[0070] Furthermore, such as Figure 8 As shown, the inner circumferential surface of the first through hole 410 is provided with a first groove 411, and the outer circumferential surface of the first bearing seat 700 is provided with a first outer ring 710, which is located in the first groove 411.

[0071] For example, suppose the side of the fascia gun 1 with the handle is the bottom and the side opposite to the handle is the top, and the first groove 411 is provided at the upper end of the first through hole 410.

[0072] In this way, on the one hand, the contact area between the first bearing housing 700 and the plastic elastic connecting rod 400 can be increased, thereby improving the relative positional stability between the first bearing housing 700 and the plastic elastic connecting rod 400. On the other hand, the first bearing housing 700 and the plastic elastic connecting rod 400 can be positioned axially in the first bearing housing 700, effectively preventing the relative position of the first bearing housing 700 and the plastic elastic connecting rod 400 from shifting.

[0073] like Figure 8 As shown, in some embodiments, the inner circumferential surface of the second through hole 420 is provided with a second groove 421, and the outer circumferential surface of the second bearing seat 800 is provided with a second outer ring 810, which is disposed in the second groove 421.

[0074] For example, suppose the side of the fascia gun 1 with the handle is the bottom and the side opposite the handle is the top, and the second groove 421 is provided at the upper end of the second through hole 420.

[0075] In this way, on the one hand, the contact area between the second bearing housing 800 and the plastic elastic connecting rod 400 can be increased, thereby improving the relative positional stability between the second bearing housing 800 and the plastic elastic connecting rod 400. On the other hand, the second bearing housing 800 and the plastic elastic connecting rod 400 can be positioned axially in the second bearing housing 800, effectively preventing the relative position of the second bearing housing 800 and the plastic elastic connecting rod 400 from shifting.

[0076] Furthermore, such as Figure 8 As shown, one of the first outer ring 710 and the plastic elastic connecting rod 400 is provided with a first positioning hole 711 and the other is provided with a first protrusion 430, the first protrusion 430 being inserted into the first positioning hole 711.

[0077] By setting the first positioning hole 711 and the first protrusion 430 to cooperate, it is possible to prevent the first bearing seat 700 from rotating relative to the plastic elastic connecting rod 400, and to increase the contact area between the first bearing seat 700 and the plastic elastic connecting rod 400. This is beneficial to improving the connection strength between the first bearing seat 700 and the plastic elastic connecting rod 400, thereby improving the positioning accuracy between the first bearing seat 700 and the plastic elastic connecting rod 400.

[0078] like Figure 8 As shown, in some embodiments, the first positioning hole 711 is located in the first outer ring 710 and extends through the edge of the first outer ring 710, and the first protrusion 430 is located in the plastic elastic connecting rod 400. Specifically, the first protrusion 430 is located in the bottom wall of the first groove 411. In this way, during the injection molding process of the plastic elastic connecting rod 400 and the first bearing seat 700 into an integral structure, the plastic elastic connecting rod 400 can enter the first positioning hole 711 from the axial direction of the first positioning hole 711 and the side of the first bearing seat 700, which facilitates the molding of the first protrusion 430. Furthermore, the connection area between the first protrusion 430 and the plastic elastic connecting rod 400 is larger, which can improve the connection strength between the first protrusion 430 and the plastic elastic connecting rod 400 and ensure the positioning reliability between the plastic elastic connecting rod 400 and the first bearing seat 700.

[0079] like Figure 8As shown, in some embodiments, there are multiple first positioning holes 711, which are spaced apart circumferentially along the first bearing 300. This increases the contact area between the first bearing housing 700 and the plastic elastic connecting rod 400, forming a multi-point positioning fit, which further improves the positioning reliability between the plastic elastic connecting rod 400 and the first bearing housing 700.

[0080] Furthermore, such as Figure 8 As shown, one of the second outer ring 810 and the plastic elastic connecting rod 400 is provided with a second positioning hole 811 and the other is provided with a second protrusion 440, the second protrusion 440 being inserted into the second positioning hole 811.

[0081] By providing the second positioning hole 811 and the cooperation of the second protrusion 440, it is possible to prevent the second bearing seat 800 from rotating relative to the plastic elastic connecting rod 400, and to increase the contact area between the second bearing seat 800 and the plastic elastic connecting rod 400. This is beneficial to improving the connection strength between the second bearing seat 800 and the plastic elastic connecting rod 400, thereby improving the positioning accuracy between the second bearing seat 800 and the plastic elastic connecting rod 400.

[0082] like Figure 8 As shown, in some embodiments, the second positioning hole 811 is located on the second outer ring 810 and extends through the edge of the second outer ring 810, and the second protrusion 440 is located on the plastic elastic connecting rod 400. Specifically, the second protrusion 440 is located on the bottom wall of the second groove 421. In this way, during the injection molding process of the plastic elastic connecting rod 400 and the second bearing seat 800 into an integral structure, the plastic elastic connecting rod 400 can enter the second positioning hole 811 from the axial direction of the second positioning hole 811 and the side of the second bearing seat 800, which facilitates the molding of the second protrusion 440. Furthermore, the connection area between the second protrusion 440 and the plastic elastic connecting rod 400 is larger, which can improve the connection strength between the second protrusion 440 and the plastic elastic connecting rod 400 and ensure the positioning reliability between the plastic elastic connecting rod 400 and the second bearing seat 800.

[0083] In some embodiments, such as Figure 8 As shown, there are multiple second positioning holes 811, which are spaced apart circumferentially along the second bearing 500. This increases the contact area between the second bearing housing 800 and the plastic elastic connecting rod 400, forming a multi-point positioning fit, which further improves the positioning reliability between the plastic elastic connecting rod 400 and the second bearing housing 800.

[0084] like Figure 8As shown, in some embodiments, the first positioning hole 711 is provided on the first outer ring 710, and the first outer ring 710 also includes a third positioning hole 712. The third positioning hole 712 is connected to the end of the first positioning hole 711 near the first bearing 300. The maximum width of the third positioning hole 712 is greater than the maximum width of the first positioning hole 711. The plastic elastic connecting rod 400 is also provided with a third protrusion 450 that cooperates with the third positioning hole 712.

[0085] In this way, the third protrusion 450 is connected to the first protrusion 430. The third protrusion 450 cannot pass through the first positioning hole 711. Therefore, the cooperation between the third protrusion 450 and the third positioning hole 712 can not only increase the contact area between the first bearing seat 700 and the plastic elastic connecting rod 400 and improve the connection strength between the first bearing seat 700 and the plastic elastic connecting rod 400, but also limit the relative position of the first bearing seat 700 and the plastic elastic connecting rod 400 in the radial direction of the first bearing seat 700.

[0086] like Figure 8 As shown, in some embodiments, the second positioning hole 811 is provided on the second outer ring 810, and the second outer ring 810 also includes a fourth positioning hole 812. The fourth positioning hole 812 is connected to the end of the second positioning hole 811 near the second bearing 500. The maximum width of the fourth positioning hole 812 is greater than the maximum width of the second positioning hole 811. The plastic elastic connecting rod 400 is also provided with a fourth protrusion 460 that cooperates with the fourth positioning hole 812.

[0087] In this way, the fourth protrusion 460 and the second protrusion 440 are connected to each other. The fourth protrusion 460 cannot pass through the second positioning hole 811. Therefore, the cooperation between the fourth protrusion 460 and the fourth positioning hole 812 can not only increase the contact area between the second bearing housing 800 and the plastic elastic connecting rod 400 and improve the connection strength between the second bearing housing 800 and the plastic elastic connecting rod 400, but also limit the relative position of the second bearing housing 800 and the plastic elastic connecting rod 400 in the radial direction of the second bearing housing 800.

[0088] like Figure 7 and Figure 8 As shown, in some embodiments, the inner circumferential surface of the first bearing housing 700 is provided with a first inner ring 720, and the first bearing 300 abuts against the first inner ring 720; or, the inner circumferential surface of the second bearing housing 800 is provided with a second inner ring 820, and the second bearing 500 abuts against the second inner ring 820; or, the inner circumferential surface of the first bearing housing 700 is provided with a first inner ring 720, the first bearing 300 abuts against the first inner ring 720, the inner circumferential surface of the second bearing housing 800 is provided with a second inner ring 820, and the second bearing 500 abuts against the second inner ring 820.

[0089] By setting the first inner ring 720, the relative position between the first bearing housing 700 and the first bearing 300 can be defined, ensuring that the first bearing 300 is installed in place, improving positioning accuracy, and eliminating the need for manual judgment on whether it is installed correctly, thus improving production efficiency. By setting the second inner ring 820, the relative position between the second bearing housing 800 and the second bearing 500 can be defined, ensuring that the second bearing 500 is installed in place, improving positioning accuracy, and eliminating the need for manual judgment on whether it is installed correctly, thus improving production efficiency.

[0090] like Figures 4-6 As shown, in some embodiments, the plastic elastic connecting rod 400 has a weight-reducing groove 470 on at least one side in its thickness direction, and a reinforcing rib 471 is provided in the weight-reducing groove 470.

[0091] For example, the plastic elastic link 400 may have a weight-reducing groove 470 on only one side of its thickness direction, or the plastic elastic link 400 may have weight-reducing grooves 470 on both opposite sides of its thickness direction. Furthermore, the reinforcing ribs 471 extend along the length of the plastic elastic link 400, and there may be multiple reinforcing ribs 471. These reinforcing ribs 471 may be arranged in parallel, or any two adjacent reinforcing ribs 471 may intersect.

[0092] By incorporating the weight-reducing groove 470, the plastic elastic connecting rod 400 can be lightened, reducing its weight and facilitating the miniaturization and weight reduction of the fascia gun 1. This also reduces the amount of material used in the plastic elastic connecting rod 400, lowering costs. Furthermore, by incorporating the reinforcing rib 471, the structural strength of the plastic elastic connecting rod 400 can be increased, preventing excessive deformation that could lead to misalignment between the first bearing 300 and the second bearing 500, thus ensuring the massage effect.

[0093] In addition, the weight reduction groove 470 is located between the first through hole 410 and the second through hole 420, and the weight reduction groove 470 is spaced apart from the first through hole 410 and the second through hole 420 to avoid affecting the structural strength of the area near the first through hole 410 and the second through hole 420, which helps to ensure the reliability of the connection between the first bearing seat 700 and the second bearing seat 800 and the plastic elastic connecting rod 400.

[0094] like Figure 4 and Figure 7 As shown, in some embodiments, the plastic elastic link 400 includes a first thickness segment 481, a transition segment 482, and a second thickness segment 483. The first thickness segment 481 is connected to the first bearing 300, and the second thickness segment 483 is connected to the second bearing 500. The thickness of the second thickness segment 483 is less than the thickness of the first thickness segment 481. The transition segment 482 is connected to both the first thickness segment 481 and the second thickness segment 483. The thickness of the transition segment 482 gradually decreases from the first thickness segment 481 to the second thickness segment 483.

[0095] For example, suppose the side of the fascia gun 1 with the handle is the bottom and the side opposite the handle is the top. The lower surface of the first thickness segment 481, the lower surface of the transition segment 482, and the lower surface of the second thickness segment 483 can be located on the same plane. The upper surface of the second thickness segment 483 is lower than the upper surface of the first thickness segment 481, and the upper surface of the transition segment 482 is arc-shaped.

[0096] 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. 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 certain conditions, the axial dimension of the second bearing 500 is usually smaller than the axial dimension of the first bearing 300. By setting the thickness of the second thickness segment 483 to be smaller than the thickness of the first thickness segment 481, while ensuring that the axial dimension of the second thickness segment 483 matches that of the second bearing 500, the space on the side of the fascia gun 1 closest to the massage head 100 can be accommodated, avoiding interference between the plastic elastic connecting rod 400 and the housing. This also reduces cost and weight, which is beneficial for the lightweighting and miniaturization of the fascia gun 1.

[0097] In addition, since the upper surface of the transition section 482 is arc-shaped, stress concentration is less likely to occur at the connection between the first thickness section 481, the transition section 482, and the second thickness section 483, which helps to reduce the probability of damage to the plastic elastic connecting rod 400.

[0098] 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 (900) includes a body (910) and an eccentric shaft (920). The body (910) and the eccentric shaft (920) are connected. The body (910) and the drive shaft (210) are connected in a transmission manner. The central axis of the eccentric shaft (920) 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 (920). A plastic elastic connecting rod (400), one end of which is connected to the outer ring of the first bearing (300), the elastic modulus of the plastic elastic connecting rod (400) is greater than or equal to 6GPa and less than or equal to 15GPa, and the Rockwell hardness of the plastic elastic connecting rod (400) is greater than or equal to R120. The outer ring of the second bearing (500) is connected to the other end of the plastic 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 plastic elastic connecting rod (400) comprises polyhexamethylene adipamide and 20% to 30% glass fiber material; Alternatively, the plastic elastic link (400) comprises nylon plastic polyamide 6 and 20% to 30% glass fiber material; Alternatively, the plastic elastic link (400) comprises polybutylene terephthalate and 20% to 30% glass fiber material; Alternatively, the plastic elastic link (400) comprises polyethylene terephthalate and 20% to 30% glass fiber material; Alternatively, the plastic elastic link (400) comprises polyphenylene sulfide and 30% to 40% glass fiber material; Alternatively, the plastic elastic link (400) may comprise polycarbonate and 20% to 30% glass fiber material.

3. The fascia gun according to claim 1, characterized in that, The plastic elastic connecting rod (400) is provided with a first through hole (410) and a second through hole (420). The fascia gun (1) also includes a first bearing seat (700) and a second bearing seat (800). The first bearing seat (700) is located in the first through hole (410) and sleeved on the first bearing (300). The second bearing seat (800) is located in the second through hole (420) and sleeved on the second bearing (500).

4. The fascia gun according to claim 3, characterized in that, The first bearing housing (700) and the plastic elastic connecting rod (400) are injection molded into an integral structure; And / or, the second bearing housing (800) and the plastic elastic connecting rod (400) are injection molded into an integral structure.

5. The fascia gun according to claim 3, characterized in that, The inner circumferential surface of the first through hole (410) is provided with a first groove (411), and the outer circumferential surface of the first bearing seat (700) is provided with a first outer ring (710), which is located in the first groove (411). And / or, the inner circumferential surface of the second through hole (420) is provided with a second groove (421), and the outer circumferential surface of the second bearing seat (800) is provided with a second outer ring (810), which is located in the second groove (421).

6. The fascia gun according to claim 5, characterized in that, One of the first outer ring (710) and the plastic elastic connecting rod (400) is provided with a first positioning hole (711) and the other is provided with a first protrusion (430), the first protrusion (430) being inserted into the first positioning hole (711); And / or, one of the second outer ring (810) and the plastic elastic connecting rod (400) is provided with a second positioning hole (811) and the other is provided with a second protrusion (440), the second protrusion (440) being inserted into the second positioning hole (811).

7. The fascia gun according to claim 6, characterized in that, The first positioning hole (711) is provided on the first outer ring (710) and extends through the edge of the first outer ring (710); And / or, the second positioning hole (811) is provided on the first outer ring (710) and extends through the edge of the first outer ring (710); And / or, there are multiple first positioning holes (711), and the multiple first positioning holes (711) are arranged at circumferential intervals along the first bearing (300); And / or, there are multiple second positioning holes (811), and the multiple second positioning holes (811) are arranged at circumferential intervals along the second bearing (500).

8. The fascia gun according to claim 6, characterized in that, The first positioning hole (711) is provided on the first outer ring (710). The first outer ring (710) also includes a third positioning hole (712). The third positioning hole (712) is connected to the end of the first positioning hole (711) near the first bearing (300). The maximum width of the third positioning hole (712) is greater than the maximum width of the first positioning hole (711). The plastic elastic connecting rod (400) is also provided with a third protrusion (450) that cooperates with the third positioning hole (712). And / or, the second positioning hole (811) is provided on the second outer ring (810), the second outer ring (810) further includes a fourth positioning hole (812), the fourth positioning hole (812) is connected to the end of the second positioning hole (811) near the second bearing (500), the maximum width of the fourth positioning hole (812) is greater than the maximum width of the second positioning hole (811), and the plastic elastic connecting rod (400) is also provided with a fourth protrusion (460) that mates with the fourth positioning hole (812).

9. The fascia gun according to claim 3, characterized in that, The inner circumferential surface of the first bearing housing (700) is provided with a first inner ring (720), and the first bearing (300) abuts against the first inner ring (720); And / or, the inner circumferential surface of the second bearing housing (800) is provided with a second inner ring (820), and the second bearing (500) abuts against the second inner ring (820).

10. The fascia gun according to any one of claims 1-9, characterized in that, The plastic elastic connecting rod (400) has a weight-reducing groove (470) on at least one side in its thickness direction, and a reinforcing rib (471) is provided in the weight-reducing groove (470); And / or, the plastic elastic connecting rod (400) includes a first thickness segment (481), a transition segment (482), and a second thickness segment (483). The first thickness segment (481) is connected to the first bearing (300), and the second thickness segment (483) is connected to the second bearing (500). The thickness of the second thickness segment (483) is less than the thickness of the first thickness segment (481). The transition segment (482) is connected to both the first thickness segment (481) and the second thickness segment (483). The thickness of the transition segment (482) gradually decreases from the first thickness segment (481) to the second thickness segment (483).

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