Transmission mechanism and fascia gun

Abstract

The application discloses a transmission mechanism and a fascia gun. The transmission mechanism comprises a driving motor, a first rotating part, a second rotating part and a linkage shaft. The first rotating part is provided with a first eccentric shaft, and the second rotating part is provided with a second eccentric shaft. The first rotating part is in driving connection with the driving motor. The first rotating part is provided with a plug-in hole in circumferential limiting cooperation with one end of the linkage shaft, and the second rotating part is provided with a threaded hole in threaded cooperation with the other end of the linkage shaft. The distance between the bottom of the plug-in hole and the bottom of the threaded hole is greater than the length of the linkage shaft. By changing the rotating direction of the driving motor, the synchronous rotation or the asynchronous rotation state of the first eccentric shaft and the second eccentric shaft can be switched, and the massage action of the massage head connected to the eccentric shaft through the connecting rod mechanism can be switched. Users can adjust the two massage heads of the fascia gun to perform synchronous massage or asynchronous massage according to their own needs, thereby improving the massage experience of the users.

Description

Technical Field

[0001] This invention relates to the field of massage equipment technology, and in particular to a transmission mechanism and a fascia gun including the transmission mechanism. Background Technology

[0002] A fascia gun is a massage device that uses massage heads on its main body to apply high-frequency impacts to muscles, thus relaxing soft tissues. Fascia guns are powered by built-in rechargeable batteries to improve battery life. Double-headed fascia guns use two massage heads, which enhances the massage effect and efficiency.

[0003] Chinese patent document CN215821631U discloses a double-headed fascia gun, including a housing, a drive mechanism and a power supply structure connected to the drive mechanism within the housing. One end of the housing forms a handle, and the other end has two massage heads. The central axes of the two massage heads form an angle. The drive mechanism is connected to the massage heads via a power reversing transmission mechanism and can drive the massage heads to reciprocate synchronously or asynchronously along the axial direction of the massage heads. Both the drive mechanism and the power supply structure are connected to a control circuit. This invention has the advantages of being able to achieve asynchronous striking and providing a good massage effect.

[0004] Chinese patent document CN216702926U discloses a asynchronous dual-head fascia gun, including a gun body, handle, battery, motor, transmission mechanism, and massage heads. The handle is located on one side of the gun body, and the battery is located inside the handle. The gun body has a receiving cavity, and the motor is located inside the receiving cavity and electrically connected to the battery. There are two transmission mechanisms, each connected to the output shaft on one side of the motor. There are two massage heads. The transmission mechanism includes an eccentric wheel, a rotating shaft, and a transmission rod. The eccentric wheel is sleeved on the output shaft of the motor, and the rotating shaft is located on the eccentric wheel. The two transmission mechanisms drive the two massage heads to move back and forth in a crisscross motion. The transmission rod is sleeved on the rotating shaft, and the massage heads are connected to the transmission rod. By placing the battery inside the handle and the motor inside the receiving cavity, the size of the handle is reduced, making it easier for the user to hold. By adjusting the angle of the two eccentric wheels mounted on the motor output shaft, asynchronous movement of the two massage heads is achieved, thus achieving a massage effect. The presence of two massage heads improves massage efficiency.

[0005] Chinese patent document CN213251096U discloses a double-headed fascia gun, relating to the technical field of fascia relaxation equipment. The gun includes a fascia gun and a handle perpendicularly connected to it. The handle houses a battery-powered motor. Two reciprocating drive shafts slide on the fascia gun, each with a detachable massage head. A transmission mechanism connected to the motor's output is located within the fascia gun. The motor, via the transmission mechanism, enables the two drive shafts to perform a cross-reciprocating motion. This invention uses a single motor to drive two drive shafts in a cross-reciprocating motion, thereby driving the two massage heads to achieve a striking or tapping effect. By using two massage heads to massage the same large muscle group, the tapping frequency is doubled, enhancing the massage effect and further shortening muscle recovery time.

[0006] The aforementioned patent documents may disclose a technical solution that uses two driving components to drive two massage heads to achieve synchronous or asynchronous strikes, or a technical solution that uses one driving component to drive two massage heads to move alternately to achieve asynchronous strikes. However, when using two driving components, the entire driving mechanism is complex and it is not conducive to controlling production costs. When using one driving component, it can only perform a single-action strike and cannot achieve the switching between synchronous and asynchronous strikes of the massage heads. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide a transmission mechanism with a simple structure and convenient transmission mode switching.

[0008] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: a transmission mechanism, including a drive motor, a first rotating component, a second rotating component, and a linkage shaft; a first eccentric shaft is provided on the first rotating component, and a second eccentric shaft is provided on the second rotating component; the first rotating component is connected to the drive motor for transmission; the first rotating component has an insertion hole that forms a circumferential limiting fit with one end of the linkage shaft, and the second rotating component has a threaded hole that forms a threaded fit with the other end of the linkage shaft; the distance between the bottom of the insertion hole and the bottom of the threaded hole is greater than the length of the linkage shaft; when the linkage shaft is axially translated to a point where it is close to the bottom of the threaded hole, the first eccentric shaft and the second eccentric shaft are axially aligned. When the drive motor drives the first rotating component to rotate and drives the second rotating component to rotate through the linkage shaft, the linkage shaft is axially translated to a point where it forms a gap with the bottom of the insertion hole or the bottom of the threaded hole. This invention links a first rotating component and a second rotating component by setting a linkage shaft. When the drive motor drives the first rotating component to rotate, the linkage shaft can drive the second rotating component to rotate. The structure of the first rotating component, the second rotating component, and the linkage shaft is constrained, creating a limiting fit between the first rotating component and the linkage shaft that allows axial sliding but not circumferential rotation. Simultaneously, a threaded fit is formed between the second rotating component and the linkage shaft. The two ends of the linkage shaft cannot simultaneously abut against both the first and second rotating components, allowing for a certain translational space between the linkage shaft and the second rotating component. Therefore, when the first rotating component rotates, the linkage shaft can rotate synchronously with it. Because of the threaded fit and translational space between the linkage shaft and the second rotating component, the linkage shaft will initially rotate relative to the second rotating component until it can no longer translate. At this point, the linkage shaft will drive the second rotating component to rotate. If the direction of the drive motor is changed, the linkage shaft can be reversed, ultimately driving both the second rotating component and the linkage shaft to rotate. Based on the aforementioned transmission principle, by limiting the translation distance of the linkage shaft, the first eccentric shaft on the first rotating component and the second eccentric shaft on the second rotating component can be positioned on the same axis or different axes during rotation, giving them the same or different rotational phases. Thus, the rotation of the first and second eccentric shafts can be achieved with just one drive motor and one linkage shaft, simplifying the entire transmission mechanism. Furthermore, by changing the rotation direction of the drive motor, the synchronous or asynchronous rotation of the first and second eccentric shafts can be switched. When the linkage shaft is in contact with the bottom of the threaded hole, i.e., when the linkage shaft translates axially toward the threaded hole until it is axially limited by the threaded hole and cannot continue translating, the first and second eccentric shafts are aligned on the same axis. The moment the linkage shaft reaches contact with the bottom of the threaded hole is the starting point for the second rotating component to rotate synchronously with the first rotating component. If the first and second eccentric shafts are aligned at this point, they will maintain a completely synchronized state throughout the subsequent rotation process.

[0009] As an improvement to the above solution, when the linkage shaft is axially translated to a point where it is close to the bottom of the threaded hole, the gap between the linkage shaft and the bottom of the insertion hole is the first gap; when the linkage shaft is axially translated to a point where it is close to the bottom of the insertion hole, the gap between the linkage shaft and the bottom of the threaded hole is the second gap; the sum of the widths of the first gap and the second gap is equal to an odd multiple of half the pitch of the threaded hole. By limiting the specific distance that the linkage shaft can translate, this distance is made to have an odd multiple correspondence with the pitch of the thread on the linkage shaft, i.e., the pitch of the threaded hole on the second rotating component. When the drive motor rotates forward, the rotational phase between the first eccentric shaft on the first rotating component and the second eccentric shaft on the second rotating component is exactly 180° apart. At this time, the first eccentric shaft and the second eccentric shaft are on different axes and the distance between them is the largest. The first eccentric shaft and the second eccentric shaft perform asynchronous rotation with the greatest difference. When the drive motor rotates in reverse, the rotational phase between the first eccentric shaft on the first rotating component and the second eccentric shaft on the second rotating component is exactly 0° apart. At this time, the first eccentric shaft and the second eccentric shaft are on the same axis and rotate synchronously.

[0010] As an improvement to the above solution, a buffer block is also included, which abuts against the bottom of the insertion hole. When the linkage shaft is axially translated to abut against the bottom of the threaded hole, the gap between the buffer block and the linkage shaft is the first gap. After the linkage shaft is axially translated to contact the bottom of the insertion hole of the first rotating component, it will continuously exert a force on the bottom of the insertion hole of the first rotating component due to the influence of the threaded fit between the linkage shaft and the second rotating component. In order to reduce the pressure wear between the first rotating component and the linkage shaft and improve the service life of the first rotating component and the linkage shaft, a buffer block is added in the insertion hole to buffer the relative force between the first rotating component and the linkage shaft. At this time, the definition of the first gap changes accordingly, and the gap between the buffer block and the linkage shaft is the first gap.

[0011] As an improvement to the above solution, the bottom of the threaded hole is provided with a concave tapered surface facing away from the opening of the threaded hole; when the linkage shaft is axially translated to abut against the bottom of the insertion hole, the axial clearance between the linkage shaft and the edge of the tapered surface is the second clearance. Since a tapered surface is formed at the bottom of the threaded hole during tapping, the point where the bottom of the linkage shaft abuts against the threaded hole is not the tapered surface at the bottom of the threaded hole. When the linkage shaft is translated towards the threaded hole, it is limited when it reaches the edge of the tapered surface inside the threaded hole. Therefore, the definition of the second clearance changes accordingly in this case; the axial clearance between the linkage shaft and the edge of the tapered surface is the second clearance.

[0012] As an improvement to the above solution, the cross-section of the end of the linkage shaft that is limited to the first rotating member is a non-circular cross-section, and the shape of the insertion hole is adapted to the cross-sectional shape of the linkage shaft. In this invention, by limiting the shape of the linkage shaft, the non-circular cross-section of the linkage shaft can be elliptical, triangular, rectangular, polygonal, or irregular, etc., which enables the insertion hole of the first rotating member to form a circumferential limit on the linkage shaft to prevent relative rotation between the linkage shaft and the first rotating member. When the first rotating member rotates under the drive of the drive motor, it can synchronously drive the linkage shaft to rotate; at the same time, it enables an axial sliding fit between the linkage shaft and the insertion hole of the first rotating member, allowing the linkage shaft to translate axially along the insertion hole.

[0013] As a preferred embodiment, the cross-sectional shape of the end of the linkage shaft that is engaged with the limiting part of the first rotating component is rectangular, and the insertion hole is a rectangular hole adapted to the linkage shaft. In this invention, the cross-sectional shape of the linkage shaft is rectangular as a preferred embodiment. When the rectangular linkage shaft is engaged with the rectangular insertion hole, it has more surfaces forming a limiting effect compared to elliptical and triangular shapes, thus providing a better circumferential limiting effect. Moreover, compared to polygonal shapes, other regular or irregular shapes, the rectangular linkage shaft is easier to process and more conducive to controlling production costs.

[0014] As an improvement to the above solution, a transmission component is also included, which is disposed between the drive motor and the first rotating component. The transmission component is connected to the output end of the drive motor and eccentrically connected to the first eccentric shaft on the first rotating component. The transmission between the drive motor and the first rotating component is achieved by setting up the transmission component. Using the eccentric shaft on the first rotating component as the connecting component between the first rotating component and the transmission component provides room for movement of the linkage mechanism subsequently installed on the eccentric shaft, thus making way for it.

[0015] As an improvement to the above solution, the transmission component is coaxially arranged with the output end of the drive motor, the first rotating component, and the second rotating component. This improvement ensures that the drive motor, transmission component, first rotating component, and second rotating component rotate coaxially, guaranteeing the stability and consistency of the rotation of the first and second rotating components.

[0016] This invention also discloses a fascia gun, including a fascia gun housing and massage heads, and a transmission mechanism as described above. The transmission mechanism is disposed within the fascia gun housing. A first eccentric shaft and a second eccentric shaft are each connected to a massage head extending outside the fascia gun housing via a linkage mechanism. The two massage heads perform synchronous or asynchronous reciprocating linear motion under the drive of the transmission mechanism via corresponding linkage mechanisms. This invention applies the aforementioned transmission mechanism to a fascia gun. Massage heads are mounted on the first eccentric shaft of the first rotating component and the second eccentric shaft of the second rotating component via linkage mechanisms. A drive motor, in conjunction with the transmission mechanism, drives the two massage heads to perform massage operations. The synchronous or asynchronous rotation of the first and second eccentric shafts can drive the two massage heads to move synchronously or asynchronously. By adjusting the rotation direction of the drive motor, the synchronous or asynchronous motion of the two massage heads can be switched. Users can set this according to their needs, thereby providing a more suitable massage effect and improving the user experience.

[0017] As an improvement to the above solution, the fascia gun housing is provided with sliding sleeves that slidably engage with the massage heads. The linkage mechanism passes through the sliding sleeves and connects to the corresponding massage heads. By setting a slide rail on the fascia gun housing to form a one-to-one limiting engagement with the linkage mechanism, the rotational motion of the linkage mechanism with the eccentric shaft is converted into linear motion, ultimately realizing the linear reciprocating motion of the massage heads.

[0018] As an improvement to the above solution, the linkage mechanism includes a connecting rod and a slider. One end of the connecting rod is rotatably connected to the slider, and the massage head is detachably connected to the slider. The other ends of the two connecting rods in the two linkage mechanisms are rotatably sleeved on the first eccentric shaft and the second eccentric shaft, respectively. The two sliders in the two linkage mechanisms are slidably engaged with the two sliding sleeves, respectively.

[0019] As an improvement to the above solution, the slider is provided with mounting holes for installing massage heads. The massage heads are inserted into the corresponding mounting holes of the slider and detachably connected to the slider. The massage heads are positioned by cooperating with the mounting holes on the slider, facilitating the installation and removal of the massage heads.

[0020] As an improvement to the above solution, a motor mounting plate is also included, fixed inside the fascia gun housing. The motor mounting plate has a through hole that fits with the output end of the drive motor. The drive motor is detachably mounted on the motor mounting plate. By setting the motor mounting plate as the mounting base for the drive motor inside the fascia gun housing, the drive motor is suspended inside the fascia gun housing. Most of the drive motor does not directly contact the fascia gun housing, which avoids collisions between the drive motor and other parts during operation and reduces vibration and noise caused by the operation of the drive motor.

[0021] As an improvement to the above solution, the motor mounting plate is provided with a bearing mounting groove, and the transmission component forms a transmission engagement with the output end of the drive motor through a transmission bearing fixed in the bearing mounting groove. This invention reduces the coefficient of friction during the rotation of the transmission component by adding a transmission bearing, making the rotation of the transmission component and the first rotating component smoother, while also providing support for the transmission component. This invention uses a bearing mounting groove to install the transmission bearing; the bearing can be directly snapped into the bearing mounting groove to achieve quick and convenient assembly.

[0022] As an improvement to the above solution, it also includes a first fixed bearing and a second fixed bearing fixed inside the fascia gun housing, with the first and second fixed bearings aligned on the same axis; the first fixed bearing has a transition fit with the first rotating component, and the second fixed bearing has a transition fit with the second rotating component. This invention, by providing the first and second fixed bearings to support the first and second rotating components respectively, reduces the coefficient of friction during rotation and provides radial restraint, ensuring that the first and second rotating components remain on the same axis during rotation, further improving the stability and consistency of their rotation.

[0023] As an improvement to the above solution, it further includes a first limiting member disposed on the first rotating member and a second limiting member disposed on the second rotating member; the first limiting member abuts against the first fixed bearing to form an axial limiting fit, and the second limiting member abuts against the second fixed bearing to form an axial limiting fit. This invention, by adding the first and second limiting members to respectively limit the first and second fixed bearings, also provides a limiting function for the first and second fixed bearings, making the rotation of the first and second rotating members more stable during operation and preventing skewness.

[0024] As a preferred embodiment, both the first and second limiting members are retaining rings, and both the first and second rotating members are provided with limiting grooves that engage with the retaining rings. This retaining ring and limiting groove engagement structure facilitates the assembly and disassembly of the limiting members.

[0025] The beneficial effects of this invention are as follows: This invention achieves the coordinated rotation of the entire mechanism through the cooperation of the first rotating component, the second rotating component, and the linkage shaft. The circumferential limiting and sliding fit between the linkage shaft and the first rotating component, as well as the threaded fit between the linkage shaft and the second rotating component, allow the linkage shaft to perform a certain axial translation distance while rotating with the first rotating component. By limiting the translation distance of the linkage shaft, the first eccentric shaft on the first rotating component and the second eccentric shaft on the second rotating component can be on the same axis or on different axes during rotation. Thus, the rotation of the first and second eccentric shafts can be achieved with one drive motor and one linkage shaft, simplifying the entire transmission mechanism and making its operation more stable. At the same time, by changing the rotation direction of the drive motor, the synchronous or asynchronous rotation state of the first and second eccentric shafts can be switched, thereby allowing the massage action of the massage head connected to the eccentric shaft via the linkage mechanism to be switched. Users can adjust the two massage heads of the fascia gun for synchronous or asynchronous massage according to their own needs, thereby improving the user's massage experience. Attached Figure Description

[0026] Figure 1 This is an exploded view of the fascia gun in this invention;

[0027] Figure 2 This is a cross-sectional view of the transmission mechanism in the present invention when it is in a synchronized state;

[0028] Figure 3 for Figure 2 A magnified view of a portion of the image;

[0029] Figure 4 This is a cross-sectional view of the transmission mechanism in the asynchronous state in this invention;

[0030] Figure 5 for Figure 4 A magnified view of a portion of the image;

[0031] Figure 6 This is a side cross-sectional view of the assembly state of the linkage shaft and the first rotating component in this invention.

[0032] The components in the diagram are labeled as follows: 100-Drive motor, 200-First rotating component, 210-First eccentric shaft, 220-Insertion hole, 230-Buffer block, 240-First limiting component, 300-Second rotating component, 310-Second eccentric shaft, 320-Threaded hole, 330-Second limiting component, 400-Linkage shaft, 500-Transmission component, 600-Fascia gun housing, 610-Sliding sleeve, 620-Motor fixing plate, 700-Massage head, 800-Linkage mechanism, 810-Linkage rod, 820-Slider, 910-Transmission bearing, 920-First fixed bearing, 930-Second fixed bearing, L1-First gap, L2-Second gap. Detailed Implementation

[0033] To facilitate understanding of the present invention, the invention will be further described below with reference to the accompanying drawings.

[0034] In the description of this invention, it should be noted that the terms "front", "rear", "left", "right", "up", "down", "inner", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of description, and do not indicate or imply that the device or component 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 invention.

[0035] like Figure 1 , Figure 2 and Figure 4 As shown, the transmission mechanism disclosed in this invention includes a drive motor 100, a first rotating component 200, a second rotating component 300, and a linkage shaft 400. The drive motor 100 serves as the driving component of the entire transmission mechanism, directly cooperating with the first rotating component 200 to drive its rotation. The first rotating component 200 then drives the second rotating component 300 to rotate via the linkage shaft 400. After the transmission mechanism is mounted on the fascia gun, the first rotating component 200 and the second rotating component 300 each cooperate with a linkage mechanism 800 to drive two massage heads 700 for massage operations. A first eccentric shaft 210 fixed on the first rotating component 200 and a second eccentric shaft 310 fixed on the second rotating component 300 are used to mount their respective linkage mechanisms 800. The eccentric shafts are eccentrically positioned to cooperate with the linkage mechanisms 800 to convert the rotation of the first rotating component 200 and the second rotating component 300 into linear reciprocating motion of the massage heads 700.

[0036] In order to achieve synchronous rotation, asynchronous rotation, and switching between synchronous and asynchronous rotation of the first rotating member 200 and the second rotating member 300 in this invention, the first rotating member 200, the second rotating member 300, and the linkage shaft 400 adopt a specific structure and cooperation method. Specifically, a plug-in hole 220 is provided in the first rotating member 200 along the direction of the rotation axis of the first rotating member 200. The plug-in hole 220 is plugged into one end of the linkage shaft 400. The plug-in hole 220 forms a circumferential limit on this end of the linkage shaft 400, so that the first rotating member 200 and the linkage shaft 400 cannot rotate relative to each other. When the first rotating member 200 rotates under the drive of the drive motor 100, it will drive the linkage shaft 400 to rotate together. At the same time, the plug-in hole 220 and the linkage shaft 400 can move relative to each other in the axial direction, that is, the linkage shaft 400 can be axially translated in the plug-in hole 220. A threaded hole 320 is provided in the second rotating member 300 along the direction of its rotation axis. An external thread that engages with the threaded hole 320 is provided on the outer circumferential surface of the other end of the linkage shaft 400. The first rotating member 200 and the second rotating member 300 are arranged opposite each other so that the insertion hole 220 and the threaded hole 320 are axially aligned. A limiting structure prevents the first rotating member 200 and the second rotating member 300 from translating, even if the distance between them remains constant. The length of the linkage shaft 400 is less than the distance between the bottom of the insertion hole 220 and the bottom of the threaded hole 320, thus leaving space for the linkage shaft 400 to translate axially between the insertion hole 220 and the threaded hole 320. When the drive motor 100 operates and drives the first rotating member 200 to rotate, taking the synchronous rotation of the first rotating member 200 and the second rotating member 300 as an example (when the drive motor 100 is in reverse rotation), ... Figure 2 and Figure 3 As shown, the first rotating component 200 rotates in reverse synchronously with the drive motor 100. At this time, the linkage shaft 400 abuts against the bottom of the threaded hole 320. There is a gap between the linkage shaft 400 and the bottom of the insertion hole 220. Due to the circumferential limiting fit between the insertion hole 220 and the linkage shaft 400, the linkage shaft 400 rotates in reverse synchronously with the first rotating component 200. The linkage shaft 400 is limited by the bottom of the threaded hole 320 and cannot rotate relative to the second rotating component 300, similar to the state of tightening threads. Then the linkage shaft 400 will drive the second rotating component 300. When the rotating parts 300 rotate together, and the drive motor 100 starts in reverse, the first rotating part 200, the linkage shaft 400, and the second rotating part 300 all rotate synchronously. In the design, with the linkage shaft 400 abutting against the bottom of the threaded hole 320, the first eccentric shaft 210 on the first rotating part 200 and the second eccentric shaft 310 on the second rotating part 300 are on the same axis. Therefore, when the first rotating part 200 and the second rotating part 300 rotate synchronously, the first eccentric shaft 210 and the second eccentric shaft 310 are in a state of synchronous rotation along the same axis. For example... Figure 4and Figure 5 As shown, when the drive motor 100 rotates forward, the first rotating component 200 rotates synchronously with the drive motor 100. Due to the circumferential limiting fit between the insertion hole 220 and the linkage shaft 400, the linkage shaft 400 rotates synchronously with the first rotating component 200. There is a gap between the linkage shaft 400 and the insertion hole 220, and relative rotation occurs between the linkage shaft 400 and the second rotating component 300, similar to the state of loosening a thread. The second rotating component 300 does not rotate synchronously with the linkage shaft 400. At this time, the linkage shaft 400 faces the insertion hole 220. The direction is axially translated until the linkage shaft 400 abuts against the bottom of the insertion hole 220 and can no longer translate. At this time, the second rotating part 300 starts to rotate along with the linkage shaft 400. Since the rotation of the second rotating part 300 is slower than that of the first rotating part 200 and the linkage shaft 400, when the drive motor 100 starts rotating in the forward direction, the second rotating part 300, the first rotating part 200 and the linkage shaft 400 rotate asynchronously. Correspondingly, the second eccentric shaft 310 and the first eccentric shaft 210 are in an asynchronous rotation state that is not on the same axis.

[0037] Based on the above principles, this invention can switch between synchronous and asynchronous rotation states of the first rotating component 200 and the second rotating component 300 by changing the rotation direction of the drive motor 100. Furthermore, by changing the maximum axial translation distance of the linkage shaft 400, the degree of difference in asynchronous rotation between the first rotating component 200 and the second rotating component 300 can be adjusted. This invention is further optimized to maximize the difference in amplitude when the first rotating component 200 and the second rotating component 300 rotate asynchronously. Even when the first rotating component 200 and the second rotating component 300 rotate asynchronously, the distance between the first eccentric shaft 210 and the second eccentric shaft 310 remains at its maximum. Therefore, when the transmission mechanism is subsequently assembled in the fascia gun to drive the massage head 700, the reciprocating vibration difference between the two massage heads 700 is maximized. When one massage head is in its extended state with maximum displacement, the other massage head is in its retracted state with minimum displacement. The two massage heads 700 alternately perform maximum amplitude percussion massage, providing users with a more stimulating massage experience. Specifically, as shown... Figure 3 and Figure 5 As shown, in this invention, the gap between the linkage shaft 400 and the bottom of the insertion hole 220 when the linkage shaft 400 is axially translated to a point where it is in contact with the bottom of the threaded hole 320 is defined as the first gap L1, and the gap between the linkage shaft 400 and the bottom of the threaded hole 320 when the linkage shaft 400 is axially translated to a point where it is in contact with the bottom of the insertion hole 220 is defined as the second gap L2; the sum of the widths of the first gap L1 and the second gap L2 is equal to an odd multiple of half the pitch of the threaded hole 320, that is, equal to an odd multiple of half the vertical pitch of the threads on the linkage shaft 400. Figure 2 and Figure 3As shown, at this time, the linkage shaft 400 is translated to be in contact with the bottom of the threaded hole 320, that is, the second gap L2 between the linkage shaft 400 and the threaded hole 320 is 0, while the first gap L1 between the linkage shaft 400 and the insertion hole 220 is equal to an odd multiple of half the pitch of the threaded hole 320; as Figure 4 and Figure 5 As shown, at this point, the linkage shaft 400 translates to be in contact with the bottom of the insertion hole 220, meaning the first gap L1 between the linkage shaft 400 and the insertion hole 220 is 0, while the second gap L2 between the linkage shaft 400 and the threaded hole 320 is an odd multiple of half the pitch of the threaded hole 320. Through these constraints, the maximum axial translation distance of the linkage shaft 400 is always equal to an odd multiple of half the pitch of the threaded hole 320. When the linkage shaft 400 is in contact with the bottom of the threaded hole 320, i.e., when the second gap L2 is 0, the first eccentric shaft 210 and the second eccentric shaft 310 are in a coaxial alignment state. At this time, the first rotating component 200 and the second rotating component 300 rotate together, and the first eccentric shaft 210 and the second eccentric shaft 310 rotate synchronously. When the linkage shaft 400 rotates 360°, the distance it translates is equal to the pitch of one thread. Correspondingly, when the linkage shaft 400 translates half the pitch of one thread, it rotates 180°. When the linkage shaft 400 translates to be in contact with the bottom of the insertion hole 220, i.e., when the first gap L1 is 0, the rotational phase difference between the first eccentric shaft 210 and the second eccentric shaft 310 is exactly 180°. At this time, the first rotating component 200 and the second rotating component 300 rotate together, and the first eccentric shaft 210 and the second eccentric shaft 310 are in an asynchronous rotation state with the largest difference in amplitude.

[0038] To reduce the compressive wear between the first rotating component 200 and the linkage shaft 400, and between the second rotating component 300 and the linkage shaft 400, thereby improving the service life of the first rotating component 200, the second rotating component 300, and the linkage shaft 400, such as... Figure 1 Of Figure 5 As shown, the present invention provides a buffer block 230 in the insertion hole 220 of the first rotating member 200, and optimizes the bottom shape of the threaded hole 320. The specific material of the buffer block 230 is not limited; any material that can provide a buffering effect can be used. With the use of the buffer block 230, the definition of the first gap L1 will also change accordingly. At this time, the first gap L1 corresponds to the gap between the buffer block 230 and the linkage shaft 400. When tapping the threaded hole 320, a tapered surface will be formed at the bottom of the threaded hole 320. At this time, the point where the bottom of the linkage shaft 400 abuts against the threaded hole 320 is not the tapered surface at the bottom of the threaded hole 320. When the linkage shaft 400 moves towards the threaded hole 320, it moves until it contacts the edge of the tapered surface inside the threaded hole 320, where it is limited. Therefore, in this case, the definition of the second gap L2 also changes accordingly; the axial gap between the linkage shaft 400 and the edge of the tapered surface is the second gap L2.

[0039] In this invention, the rotation of the linkage shaft 400 by the first rotating member 200 is achieved through the circumferential limiting fit between the insertion hole 220 on the first rotating member 200 and the linkage shaft 400. Specifically, as shown... Figure 6 As shown, the cross-section of the end of the linkage shaft 400 that is in limiting engagement with the first rotating member 200 is set to a non-circular cross-section. Simultaneously, the shape of the insertion hole 220 is set to match the cross-sectional shape of the linkage shaft 400. Therefore, after the linkage shaft 400 is inserted into the insertion hole 220, it cannot rotate within the insertion hole 220 but can move axially. The non-circular cross-section of the linkage shaft 400 can be elliptical, triangular, rectangular, polygonal, regular, or irregular, as long as it prevents relative rotation between the linkage shaft 400 and the first rotating member 200. In this invention, a rectangular linkage shaft, which is not only easy to manufacture but also has a good circumferential limiting effect, is used as the optimal solution.

[0040] When the aforementioned transmission mechanism is applied to a fascia gun, the first rotating component 200 needs to drive one of the massage heads 700 via the first eccentric shaft 210. Other transmission structures need to be installed on the first eccentric shaft 210 to convert its rotational motion into the linear reciprocating motion of the massage head 700. Therefore, a transition component needs to be provided between the first rotating component 200 and the drive motor 100 to allow for clearance, such as... Figure 1 , Figure 2 and Figure 4 As shown, this invention adds a transmission component 500 between the first rotating component 200 and the drive motor 100. One end of the transmission component 500 is connected to the output end of the drive motor 100, and the other end is eccentrically connected to the first eccentric shaft 210. The first eccentric shaft 210 directly serves as the input component for the rotation of the first rotating component 200, and also as the output component for the first rotating component 200 to the massage head 700, simplifying the entire transmission mechanism. The transmission component 500, the output end of the drive motor 100, the first rotating component 200, and the second rotating component 300 are preferably coaxially aligned to ensure the stability and consistency of the rotation of the first rotating component 200 and the second rotating component 300.

[0041] This invention also discloses a fascia gun employing the above-described transmission mechanism, such as... Figure 1As shown, the transmission mechanism is installed inside the fascia gun housing 600. The two massage heads 700 of the fascia gun are respectively connected to the first eccentric shaft 210 on the first rotating member 200 and the second eccentric shaft 310 on the second rotating member 300 via linkage mechanisms 800. The two linkage mechanisms 800 cooperate with the two eccentric shafts to convert the rotational motion of the two rotating members into the reciprocating linear motion of the corresponding massage heads 700. Since the first rotating member 200 and the second rotating member 300 can rotate synchronously or asynchronously under the reverse or forward drive of the drive motor 100, the two massage heads 700 can be driven to vibrate synchronously or asynchronously. By changing the drive direction of the drive motor 100, the two massage heads 700 can switch between synchronous massage and asynchronous massage, thereby improving the user's massage experience.

[0042] Specifically, such as Figure 1 , Figure 2 and Figure 4 As shown, the linkage mechanism 800 used in this invention consists of a connecting rod 810 and a slider 820. One end of each of the two connecting rods 810 in the two linkage mechanisms 800 is rotatably connected to the corresponding slider 820 via a pivot-like component. The other ends of the two connecting rods 810 are respectively sleeved on the first eccentric shaft 210 and the second eccentric shaft 310. Two sliding sleeves 610 are fixed on the fascia gun housing 600, which are respectively in sliding engagement with the two massage heads 700. The two linkage mechanisms 800 pass through the sliding sleeves 610 and are connected to the corresponding massage heads 700. The two sliders 820 in the two linkage mechanisms 800 are in sliding engagement with the two sliding sleeves 610 respectively. When the first eccentric shaft 210 and the second eccentric shaft 310 rotate, the corresponding linkage mechanism 800 can drive the corresponding massage head 700 to perform linear reciprocating motion under the limiting action of the sliding sleeve 610. To facilitate the assembly and disassembly of the massage head 700, the present invention provides mounting holes for mounting the massage head 700 on the slider 820. The massage head 700 is inserted into the corresponding mounting hole of the slider 820 and detachably connected to the slider 820. The detachable connection between the massage head 700 and the slider 820 can be achieved by means of threaded connection, snap-fit ​​connection, fastener connection, etc.

[0043] like Figure 1 , Figure 2 and Figure 4As shown, in this invention, the drive motor 100 is mounted and fixed within the fascia gun housing 600 using a motor mounting plate 620. The motor mounting plate 620 is fixed inside the fascia gun housing 600, and a through hole is provided on the motor mounting plate 620 for the output end of the drive motor 100 to pass through. The drive motor 100 is fixed to the motor mounting plate 620 by screws or other fasteners. By using the motor mounting plate 620 to suspend the drive motor 100, the drive motor 100 will not directly contact the fascia gun housing 600, thereby avoiding vibration and noise caused by collisions between the drive motor 100 and other parts during operation. To reduce the coefficient of friction during the rotation of the first rotating component 200 driven by the transmission component 500, a transmission bearing 610 can be installed on the motor mounting plate 620 to assist the rotation of the transmission component 500. Specifically, a bearing mounting groove is provided on the motor mounting plate 620, the transmission bearing 610 is fixed in the bearing mounting groove, the outer ring of the transmission bearing 610 is clamped in the bearing mounting groove, and the inner ring of the transmission bearing 610 is connected to the transmission component 500.

[0044] like Figures 1 to 5 As shown, the present invention uses a first fixed bearing 920 and a second fixed bearing 930 to support the first rotating component 200 and the second rotating component 300, respectively. The first fixed bearing 920 and the second fixed bearing 930 are coaxially aligned within the fascia gun housing 600. The outer rings of both bearings are fixed to the fascia gun housing 600. The first fixed bearing 920 has a transition fit with the first rotating component 200, and the second fixed bearing 930 has a transition fit with the second rotating component 300. The first fixed bearing 920 and the second fixed bearing 930 respectively provide radial limiting for the first rotating component 200 and the second rotating component 300, ensuring that the first rotating component 200 and the second rotating component 300 remain on the same axial position during rotation. It also includes a first limiting member 240 disposed on the first rotating member 200 and a second limiting member 330 disposed on the second rotating member 300. The first limiting member 240 abuts against the first fixed bearing 920 to form an axial limiting fit, and the second limiting member 330 abuts against the second fixed bearing 930 to form an axial limiting fit. Both the first limiting member 240 and the second limiting member 330 can be easily disassembled and assembled using snap rings, and both the first rotating member 200 and the second rotating member 300 are provided with limiting grooves that engage with the snap rings.

Claims

1. A transmission mechanism, characterized in that: It includes a drive motor (100), a first rotating component (200), a second rotating component (300), and a linkage shaft (400); the first rotating component (200) is provided with a first eccentric shaft (210), and the second rotating component (300) is provided with a second eccentric shaft (310); the first rotating component (200) is connected to the drive motor (100) for transmission; the first rotating component (200) is provided with a plug hole (220) that forms a circumferential limiting fit with one end of the linkage shaft (400); the second rotating component... (300) is provided with a threaded hole (320) that forms a threaded fit with the other end of the linkage shaft (400); the distance between the first rotating part (200) and the second rotating part (300) remains fixed, and the distance between the bottom of the insertion hole (220) and the bottom of the threaded hole (320) is greater than the length of the linkage shaft (400); when the linkage shaft (400) is axially translated to be close to the bottom of the threaded hole (320), the first eccentric shaft (210) and the second eccentric shaft (310) are axially aligned.

2. The transmission mechanism as described in claim 1, characterized in that: When the linkage shaft (400) is axially translated to be close to the bottom of the threaded hole (320), the gap between the linkage shaft (400) and the bottom of the insertion hole (220) is the first gap; when the linkage shaft (400) is axially translated to be close to the bottom of the insertion hole (220), the gap between the linkage shaft (400) and the bottom of the threaded hole (320) is the second gap; the sum of the widths of the first gap and the second gap is equal to an odd multiple of half the pitch of the threaded hole (320).

3. The transmission mechanism as described in claim 2, characterized in that: It also includes a buffer block (230) disposed in the insertion hole (220), the buffer block (230) abutting against the bottom of the insertion hole (220); when the linkage shaft (400) is axially translated to abut against the bottom of the threaded hole (320), the gap between the buffer block (230) and the linkage shaft (400) is the first gap.

4. The transmission mechanism as described in claim 2, characterized in that: The bottom of the threaded hole (320) is provided with a conical surface that is recessed in the direction away from the opening of the threaded hole (320); when the linkage shaft (400) is axially translated to be close to the bottom of the insertion hole (220), the axial gap between the linkage shaft (400) and the edge of the conical surface is the second gap.

5. The transmission mechanism as described in claim 1, characterized in that: The cross-section of the end of the linkage shaft (400) that is limited to the first rotating part (200) is a non-circular cross-section, and the shape of the insertion hole (220) is adapted to the cross-sectional shape of the linkage shaft (400).

6. The transmission mechanism as described in claim 5, characterized in that: The cross-sectional shape of one end of the linkage shaft (400) that is limited to the first rotating part (200) is rectangular, and the insertion hole (220) is a rectangular hole adapted to the linkage shaft (400).

7. The transmission mechanism as described in any one of claims 1 to 6, characterized in that: It also includes a transmission component (500) disposed between the drive motor (100) and the first rotating component (200), the transmission component (500) being connected to the output end of the drive motor (100) and eccentrically connected to the first eccentric shaft (210) on the first rotating component (200).

8. The transmission mechanism as described in claim 7, characterized in that: The transmission component (500) is coaxially arranged with the output end of the drive motor (100), the first rotating component (200), and the second rotating component (300).

9. A fascia gun, comprising a fascia gun housing (600) and a massage head (700), characterized in that: It also includes the transmission mechanism as described in claim 7; the transmission mechanism is disposed inside the fascia gun housing (600), and the first eccentric shaft (210) and the second eccentric shaft (310) are each connected to the massage head (700) extending out of the fascia gun housing (600) through the linkage mechanism (800), and the two massage heads (700) perform synchronous reciprocating linear motion or asynchronous reciprocating linear motion under the drive of the transmission mechanism through the corresponding linkage mechanism (800).

10. The fascia gun as described in claim 9, characterized in that: The fascia gun housing (600) is provided with sliding sleeves (610) that are slidably engaged with the massage heads (700). The linkage mechanism (800) passes through the sliding sleeves (610) and is connected to the corresponding massage heads (700).

11. The fascia gun as described in claim 10, characterized in that: The linkage mechanism (800) includes a connecting rod (810) and a slider (820). One end of the connecting rod (810) is rotatably connected to the slider (820), and the massage head (700) is detachably connected to the slider (820). The other ends of the two connecting rods (810) in the two linkage mechanisms (800) are respectively rotatably sleeved on the first eccentric shaft (210) and the second eccentric shaft (310). The two sliders (820) in the two linkage mechanisms (800) are respectively slidably engaged with the two sliding sleeves (610).

12. The fascia gun as described in claim 11, characterized in that: The slider (820) is provided with mounting holes for mounting massage heads (700). The massage heads (700) are inserted into the mounting holes of the corresponding slider (820) and are detachably connected to the slider (820).

13. The fascia gun as described in claim 9, characterized in that: It also includes a motor mounting plate (620) fixed inside the fascia gun housing (600), and the motor mounting plate (620) is provided with a through hole that is clearance-fitted with the output end of the drive motor (100); the drive motor (100) is detachably mounted on the motor mounting plate (620).

14. The fascia gun as described in claim 13, characterized in that: The motor mounting plate (620) is provided with a bearing mounting groove, and the transmission component (500) forms a transmission engagement with the output end of the drive motor (100) through the transmission bearing (910) fixed in the bearing mounting groove.

15. The fascia gun as described in claim 9, characterized in that: It also includes a first fixed bearing (920) and a second fixed bearing (930) fixed inside the fascia gun housing (600), the first fixed bearing (920) and the second fixed bearing (930) being aligned on the same axis; the first fixed bearing (920) is transitionally fitted with the first rotating component (200), and the second fixed bearing (930) is transitionally fitted with the second rotating component (300).

16. The fascia gun as described in claim 15, characterized in that: It also includes a first limiting member (240) disposed on the first rotating member (200) and a second limiting member (330) disposed on the second rotating member (300); the first limiting member (240) abuts against the first fixed bearing (920) to form an axial limiting fit, and the second limiting member (330) abuts against the second fixed bearing (930) to form an axial limiting fit.

17. The fascia gun as described in claim 16, characterized in that: The first limiting member (240) and the second limiting member (330) are both snap rings, and the first rotating member (200) and the second rotating member (300) are both provided with limiting grooves that engage with the snap rings.

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