Variable amplitude fascia gun and its driving mechanism

Abstract

The present invention belongs to the field of massage equipment, and specifically discloses a drive mechanism of a variable amplitude fascia gun with better structural stability, and a variable amplitude fascia gun including the above-mentioned drive mechanism. The drive mechanism provided by the present invention can realize the switching of the eccentricity of the eccentric shaft between e1 and e2, so that the piston rod produces an amplitude of A1 or A2; and the drive mechanism adopts a bearing to tightly fit the rotating shaft, so there is basically no looseness, high stability, and less noise and jitter when the motor runs at high speed. In addition, the drive mechanism is composed of fewer parts, and the rotating shaft only rotates within the arc range of the rotating fixed arc groove, and the eccentricity can be switched without moving back and forth, so the structure is compact, the space occupied is small, and the material requirements for parts are low, which is conducive to cost saving.

Description

Technical Field

[0001] The invention belongs to the field of massage equipment, and in particular relates to a variable amplitude fascia gun and a driving mechanism thereof. Background Art

[0002] The fascia gun, also known as the deep myofascial impactor, is a soft tissue massage tool that relaxes the body's soft tissues through high-frequency impacts. The existing fascia gun drives the massage head to make reciprocating linear reciprocating motions through the massage drive mechanism. The massage head contacts the human body and generates high-frequency vibrations that act on the deep muscle layer, which reduces local tissue tension, relieves pain, and promotes blood circulation.

[0003] The existing massage drive mechanism is mainly composed of a motor, an eccentric wheel arranged on the output end of the motor, a transmission arm hinged to the eccentric shaft of the eccentric wheel at one end, and a piston rod hinged to the other end of the transmission arm at the tail. During the operation of the fascia gun, the motor drives the eccentric wheel, the transmission arm, the piston rod and the massage head to form a striking massage mode, and its amplitude, that is, the striking distance, is determined by the eccentricity of the eccentric shaft on the eccentric wheel.

[0004] However, the existing massage drive mechanism is a fixed eccentric shaft, and the eccentricity cannot be adjusted. For example, the massage drive mechanism with a striking distance of 8mm has the same striking distance in both forward and reverse rotations. When the striking distance is large, hitting the area with less muscle will cause pain, and when the striking distance is small, hitting the area with more muscle will not have much massage effect. Therefore, it is far from meeting the customer's demand for different amplitudes of the fascia gun when massaging different positions.

[0005] In order to solve the above problems, people have designed a drive mechanism and a fascia gun that drives the eccentric wheel to form two different eccentricities through the forward and reverse rotation of the motor. For example, the Chinese utility model patent with the authorization announcement number CN211214299U discloses a massage drive mechanism and a massage gun with variable amplitude, which includes: a base, an eccentric drive device, an adjustment device, a transmission member and a control member; the eccentric drive device is arranged on the base, and a drive shaft and a first eccentric shaft are arranged on the base; the adjustment device is rotatably arranged on the first eccentric shaft, and the rotating shaft of the adjustment device is coaxially arranged with the first eccentric shaft, and the adjustment device is provided with a second eccentric shaft; the transmission member is rotatably arranged on the second eccentric shaft to drive the massage head to vibrate; the control member controls the relative state of the adjustment device and the eccentric drive device to change the output eccentricity of the eccentric drive device, thereby changing the amplitude of the massage head.

[0006] Although the above-mentioned massage drive mechanism and massage gun make the adjustment device in a synchronous rotation state or a relatively static state relative to the eccentric drive device when the drive shaft rotates forward and reversely, thereby changing the output eccentricity of the eccentric drive device and realizing forward and reverse rotation to change the vibration amplitude of the massage head; however, its structure occupies a large space and has poor stability. The eccentric shaft requires a sufficiently large fixing force and has high requirements on the material of the parts. Otherwise, there is a risk of jamming or damage, and when the motor runs at high speed, it is easy to have problems such as loud noise and severe shaking. Summary of the invention

[0007] The technical problem to be solved by the present invention is to provide a driving mechanism of a variable amplitude fascia gun with better structural stability.

[0008] The technical solution adopted by the present invention to solve the technical problem is: the driving mechanism of the variable amplitude fascia gun includes a motor, an eccentric wheel assembly, a transmission arm and a piston rod, the two ends of the transmission arm are respectively hinged to the eccentric shaft of the eccentric wheel assembly and the tail of the piston rod; the eccentric wheel assembly includes an eccentric wheel body, a bearing and a rotating shaft;

[0009] The eccentric wheel body is provided with a bearing hole, a rotating fixed arc groove and a motor connection structure, and the eccentric wheel body is installed on the output end of the motor through the motor connection structure;

[0010] The bearing is installed in the bearing hole;

[0011] The rotating shaft comprises an eccentric shaft, a lower mounting column and a guide column which are connected together and are not coaxial with each other. The rotating shaft is mounted together through the lower mounting column and the inner hole of the bearing, and the guide column is embedded in the rotating fixed arc groove;

[0012] The guide column can move around the lower mounting column in the rotating fixed arc groove. When the guide column moves to one end of the rotating fixed arc groove, the eccentricity between the eccentric shaft and the rotation center of the eccentric wheel body is e1; when the guide column moves to the other end of the rotating fixed arc groove, the eccentricity between the eccentric shaft and the rotation center of the eccentric wheel body is e2, and e2≠e1.

[0013] Furthermore, the eccentric wheel body comprises a lower eccentric wheel and an upper eccentric wheel, the upper eccentric wheel is arranged on the upper side of the lower eccentric wheel and fixed by an eccentric wheel connecting member; the bearing hole is arranged on the upper part of the upper eccentric wheel, the rotating fixed arc groove is arranged on the upper part of the lower eccentric wheel, and the motor connecting structure is arranged on the lower eccentric wheel;

[0014] The rotating shaft further comprises a shaft disc, a rotating sleeve and a rotating shaft connecting piece; the eccentric shaft and the lower mounting column are respectively arranged on the top surface and the bottom surface of the shaft disc, and the guide column is arranged on the bottom surface of the rotating sleeve;

[0015] The lower mounting column is embedded from the upper end of the inner hole of the bearing, and the rotating sleeve is arranged on the lower side of the bearing and connected with the lower mounting column through a rotating shaft connecting piece.

[0016] Furthermore, the motor connection structure includes a drive connection hole arranged at the bottom of the lower eccentric wheel, a locking screw hole arranged at the side of the lower eccentric wheel, and a locking screw threadedly installed in the locking screw hole, and the output end of the motor is embedded in the drive connection hole and tightened by the locking screw.

[0017] Furthermore, a rotating sleeve mounting hole corresponding to and communicating with the bearing hole is provided at the lower portion of the upper eccentric wheel, a retaining ring is provided between the rotating sleeve mounting hole and the bearing hole, and the rotating sleeve is rotatably arranged in the rotating sleeve mounting hole.

[0018] Furthermore, the lower eccentric wheel and the upper eccentric wheel are provided with a matching fixing structure.

[0019] Furthermore, the matching fixing structure includes at least two fixing columns arranged on the top surface of the lower eccentric wheel, and fixing holes arranged on the lower part of the upper eccentric wheel and matched with the fixing columns.

[0020] Furthermore, the bearing hole is arranged at the upper part of the eccentric wheel body, and the rotating fixed arc groove is arranged at the lower part of the eccentric wheel body; the rotating shaft also includes a shaft disk, a rotating sleeve and a rotating shaft connecting piece; the eccentric shaft and the lower mounting column are respectively arranged on the top surface and the bottom surface of the shaft disk, and the guide column is arranged on the top surface of the rotating sleeve; the lower mounting column is embedded from the upper end of the bearing inner hole, and the rotating sleeve is arranged on the lower side of the bearing and is connected to the lower mounting column through the rotating shaft connecting piece.

[0021] Furthermore, a rotating sleeve mounting hole corresponding to and communicating with the bearing hole is provided at the lower portion of the eccentric wheel body, a retaining ring is provided between the rotating sleeve mounting hole and the bearing hole, and the rotating sleeve is rotatably arranged in the rotating sleeve mounting hole.

[0022] Furthermore, the rotating fixed arc groove is arranged on the bottom surface of the retaining ring.

[0023] Furthermore, the bearing hole and the rotating fixed arc groove are both arranged on the upper part of the eccentric wheel body; the rotating shaft also includes a shaft disk, the eccentric shaft is arranged on the top surface of the shaft disk, and the lower mounting column and the guide column are both arranged on the bottom surface of the shaft disk.

[0024] Based on the same inventive concept, the present invention also provides a drive mechanism of a variable amplitude fascia gun, comprising a motor, an eccentric wheel assembly, a transmission arm and a piston rod, wherein the two ends of the transmission arm are respectively hinged to the eccentric shaft of the eccentric wheel assembly and the tail of the piston rod; the eccentric wheel assembly comprises an eccentric wheel body, a bearing and a rotating shaft;

[0025] The eccentric wheel body is provided with a bearing hole, a rotating fixed arc groove and a motor connection structure, and the eccentric wheel body is installed on the output end of the motor through the motor connection structure;

[0026] The bearing is an eccentric bearing and is installed in the bearing hole;

[0027] The rotating shaft comprises an eccentric shaft, a lower mounting column and a guide column connected together, the lower mounting column is coaxial with the eccentric shaft, and the guide column is not coaxial with the eccentric shaft; the rotating shaft is mounted together through the lower mounting column and the inner hole of the bearing, and the guide column is embedded in the rotating fixed arc groove;

[0028] The lower mounting column can rotate eccentrically with the bearing and drive the guide column to move in the rotating fixed arc groove. When the guide column moves to one end of the rotating fixed arc groove, the eccentric distance between the eccentric shaft and the rotation center of the eccentric wheel body is e1; when the guide column moves to the other end of the rotating fixed arc groove, the eccentric distance between the eccentric shaft and the rotation center of the eccentric wheel body is e2, and e2≠e1.

[0029] Furthermore, the bearing hole is arranged on the upper part of the eccentric wheel body, a rotating sleeve hole is arranged on the inner bottom surface of the bearing hole, and the rotating fixed arc groove is arranged on the inner bottom surface of the rotating sleeve hole; the rotating shaft also includes a shaft disk, a rotating sleeve and a rotating shaft connecting piece; the eccentric shaft and the lower mounting column are respectively arranged on the top surface and the bottom surface of the shaft disk, and the guide column is arranged on the bottom surface of the rotating sleeve; the lower mounting column is embedded from the upper end of the bearing inner hole, and the rotating sleeve is arranged in the rotating sleeve hole and is connected to the lower mounting column through the rotating shaft connecting piece.

[0030] Furthermore, a connecting column is provided on the upper part of the rotating sleeve, which is embedded in the lower end of the inner hole of the bearing and is in contact with the bottom surface of the lower mounting column.

[0031] Furthermore, the motor connection structure includes a drive connection hole arranged at the bottom of the eccentric wheel body, a locking screw hole arranged on the side of the lower eccentric wheel, and a locking screw threadedly installed in the locking screw hole, and the output end of the motor is embedded in the drive connection hole and tightened by the locking screw.

[0032] Furthermore, the cross-section of the output end of the motor is in a "D" shape, the drive connection hole is a "D"-shaped structure matching the output end of the motor, and the locking screw is tightened on the side vertical plane of the motor output end.

[0033] Furthermore, the degree of the central angle corresponding to the entire arc segment of the rotating fixed arc groove is 45° to 180°.

[0034] Furthermore, the degree of the central angle corresponding to the entire arc segment of the rotating fixed arc groove is 90°.

[0035] Furthermore, the difference between e1 and e2 is 3 to 4 mm.

[0036] The present invention also provides a variable amplitude fascia gun, comprising a shell and a driving mechanism of the above-mentioned variable amplitude fascia gun, wherein the driving mechanism is arranged in the shell, the motor is fixedly connected to the shell through a motor fixing bracket, and the piston rod is movably connected to the shell through a sliding sleeve.

[0037] Furthermore, the variable amplitude fascia gun also includes a main control board; a motor forward and reverse control switch is provided on the shell, and the motor and the motor forward and reverse control switch are electrically connected to the main control board respectively.

[0038] The beneficial effects of the present invention are as follows: the first type of driving mechanism provided by the present invention designs the rotating shaft to include an eccentric shaft, a lower mounting column and a guide column which are connected together and are not coaxial with each other, and the lower mounting column is installed and fixed in the bearing hole of the eccentric wheel body through the cooperation of the lower mounting column and the bearing; during the forward and reverse rotation of the motor, the lower mounting column is used as the fulcrum for the rotation of the rotating shaft, and the guide column is used to cooperate with the rotating fixed arc groove for guidance and limiting, so that the eccentric distance of the eccentric shaft can be switched between e1 and e2, so that the piston rod can generate an amplitude of A1 or A2; in the second type of driving mechanism provided by the present invention, the rotating shaft includes an eccentric shaft, a lower mounting column which are connected together and are not coaxial with each other, and the lower mounting column is installed and fixed in the bearing hole of the eccentric wheel body through the cooperation of the lower mounting column and the bearing; during the forward and reverse rotation of the motor, the lower mounting column is used as the fulcrum for the rotation of the rotating shaft, and the guide column is used to cooperate with the rotating fixed arc groove for guidance and limiting, so as to realize the purpose of switching the eccentric distance of the eccentric shaft between e1 and e2, so as to make the piston rod generate an amplitude of A1 or A2; The lower mounting column and the guide column are coaxial with the eccentric shaft, and the guide column is not coaxial with the eccentric shaft, and is fixed in the bearing hole of the eccentric wheel body through the cooperation of the lower mounting column and the eccentric bearing; during the forward and reverse rotation of the motor, the outer ring of the bearing is used as the fulcrum for the rotation of the rotating shaft, and the guide column and the rotating fixed arc groove are used for guidance and limiting, and the eccentricity of the eccentric shaft can be switched between e1 and e2, so that the piston rod produces an amplitude of A1 or A2; the above two types of drive mechanisms are simple to assemble, and both use bearings to tightly fit the rotating shaft, so there is basically no looseness, high stability, and less noise and jitter when the motor runs at high speed. In addition, the above two types of drive mechanisms are composed of fewer parts, and the rotating shaft only rotates within the arc range of the rotating fixed arc groove, and the eccentricity can be switched without moving back and forth, so the structure is compact, the space occupied is small, and the material requirements for parts are low, which is conducive to cost saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a cross-sectional structural schematic diagram of an embodiment of the driving mechanism of the present invention;

[0040] Figure 2 yes Figure 1 A three-dimensional exploded view of an embodiment;

[0041] Figure 3 is a cross-sectional structural schematic diagram of another embodiment of the driving mechanism of the present invention;

[0042] Figure 4 yes Figure 3 A three-dimensional exploded view of an embodiment;

[0043] Figure 5 is a cross-sectional structural schematic diagram of another embodiment of the driving mechanism of the present invention;

[0044] Figure 6 yes Figure 5 A three-dimensional exploded view of an embodiment;

[0045] Figure 7 yes Figure 5 A schematic diagram of the three-dimensional structure of the eccentric wheel body in the embodiment;

[0046] Figure 8 is a cross-sectional structural schematic diagram of another embodiment of the driving mechanism of the present invention;

[0047] Fig. 9 yes Figure 8 A three-dimensional exploded view of an embodiment;

[0048] Fig.10 yes Figure 8 A schematic diagram of the top view of the eccentric wheel body in the embodiment;

[0049] Marked in the figure are: motor 100, motor fixing bracket 120, eccentric wheel body 210, bearing hole 211, rotating fixed arc groove 212, lower eccentric wheel 213, upper eccentric wheel 214, eccentric wheel connecting piece 215, drive connecting hole 216, locking screw 217, rotating sleeve mounting hole 218, fixing column 219, bearing 220, rotating shaft 230, eccentric shaft 231, lower mounting column 232, guide column 233, shaft disc 234, rotating sleeve 235, rotating shaft connecting piece 236, transmission arm 300, piston rod 400, sliding sleeve 410. DETAILED DESCRIPTION

[0050] The present invention will be further described below in conjunction with the accompanying drawings.

[0051] In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "front", "rear", "left", "right", "upper", "lower", "inner", etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description, and do not indicate or imply that the devices or components referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0052] like Figure 1 and Figure 2 ,or Figure 3 and Figure 4 ,or Figure 5 and Figure 6 As shown, the driving mechanism of the variable amplitude fascia gun includes a motor 100, an eccentric wheel assembly, a transmission arm 300 and a piston rod 400, and the two ends of the transmission arm 300 are respectively hinged to the eccentric shaft 231 of the eccentric wheel assembly and the tail of the piston rod 400; the eccentric wheel assembly includes an eccentric wheel body 210, a bearing 220 and a rotating shaft 230;

[0053] The eccentric wheel body 210 is provided with a bearing hole 211, a rotation fixed arc groove 212 and a motor connection structure, and the eccentric wheel body 210 is installed on the output end of the motor 100 through the motor connection structure;

[0054] The bearing 220 is installed in the bearing hole 211;

[0055] The rotating shaft 230 includes an eccentric shaft 231, a lower mounting column 232 and a guide column 233 which are connected together and are not coaxial with each other. The rotating shaft 230 is mounted together with the inner hole of the bearing 220 through the lower mounting column 232, and the guide column 233 is embedded in the rotating fixed arc groove 212;

[0056] The guide column 233 can move around the lower mounting column 232 in the rotating fixed arc groove 212. When the guide column 233 moves to one end of the rotating fixed arc groove 212, the eccentricity between the eccentric shaft 231 and the rotation center of the eccentric wheel body 210 is e1; when the guide column 233 moves to the other end of the rotating fixed arc groove 212, the eccentricity between the eccentric shaft 231 and the rotation center of the eccentric wheel body 210 is e2, and e2≠e1.

[0057] The above driving mechanism can change the position of the rotating shaft 230 after rotation through the forward and reverse rotation of the motor 100, so as to realize the switching of the eccentric distance of the eccentric shaft 231 between e1 and e2, so that the piston rod 400 can produce a massage distance with an amplitude of A1 or A2, A1≠A2; its specific working principle is: when the motor 100 drives the eccentric wheel body 210 to rotate forward, the rotating shaft 230 rotates relative to the eccentric wheel body 210 with the lower mounting column 232 as the rotation center, and at the same time, the guide column 233 moves around the lower mounting column 232 in the rotating fixed arc groove 212, and when the guide column 233 moves to one end of the rotating fixed arc groove 212, the rotating shaft 230 is in a forward rotation limit state, so that the motor 100 can drive the entire eccentric wheel assembly to rotate, and drive The transmission arm 300 and the piston rod 400 are linked, and a massage head is installed on the head of the piston rod 400 to form a percussion massage mode with an amplitude of A1; when the motor 100 drives the eccentric wheel body 210 to reverse, the rotating shaft 230 rotates relative to the eccentric wheel body 210 with the lower mounting column 232 as the rotation center, and the guide column 233 moves around the lower mounting column 232 in the rotating fixed arc groove 212. When the guide column 233 moves to the other end of the rotating fixed arc groove 212, the rotating shaft 230 is in a reverse limit state, so that the motor 100 can drive the entire eccentric wheel assembly to rotate, and drive the transmission arm 300 and the piston rod 400 to link, and the massage head is installed on the head of the piston rod 400 to form a percussion massage mode with an amplitude of A2. Since the driving mechanism uses the bearing 220 to tightly fit the rotating shaft 230, it will basically not be loosened during use, the structural stability is high, and the noise and vibration generated when the motor 100 runs at high speed are small. Moreover, the driving mechanism is composed of fewer parts. The rotating shaft 230 only rotates within the arc range of the rotating fixed arc groove 212, and the eccentricity switching can be achieved without forward and backward movement. Therefore, the structure is compact, occupies a small space, is easy to assemble and has high efficiency. In addition, the driving mechanism has low requirements on the material of parts and components. It can be made of metal materials such as iron, copper, aluminum, zinc, etc. according to the required strength of the product, which is conducive to cost saving.

[0058] Among them, the motor 100 is the driving device of the driving mechanism, which can be of various types, preferably a brushless motor. In order to facilitate the installation and connection between the motor 100 and the eccentric wheel body 210, the output end of the motor 100 is usually set to a variety of structures, such as: triangle, quadrilateral, prism, etc., or an anti-rotation structure is set at the output end of the motor 100; preferably, the output end of the motor 100 is set to a structure with a "D"-shaped cross section. The motor 100 is generally installed and fixed in the housing of the fascia gun through a motor fixing bracket 120. The motor fixing bracket 120 is generally fixed to the motor 100 by screws, and the frame rod of the motor fixing bracket 120 is generally fixed to the stud in the housing by screws and vibration-damping washers.

[0059] The eccentric wheel assembly is mainly composed of components such as an eccentric wheel body 210, a bearing 220 and a rotating shaft 230; the eccentric wheel body 210 is a carrier component of the eccentric wheel assembly, mainly used for the installation and setting of components such as the bearing 220 and the rotating shaft 230, and is connected to the motor 100 for transmission; the bearing hole 211 provided on the eccentric wheel body 210 is mainly used for installing and setting the bearing 220.

[0060] The rotating fixed arc groove 212 provided on the eccentric wheel body 210 is mainly used for guiding and limiting the guide column 233, so as to provide auxiliary support to the rotating shaft 230 when it rotates and limit the eccentricity of its output to e1 or e2. The length, curvature and arrangement direction of the rotating fixed arc groove 212 can determine the eccentricity of the eccentric shaft 231. It is preferred to limit the degree of the central angle corresponding to the entire arc segment of the rotating fixed arc groove 212 to 45° to 180°, and more preferably to 90°; the central angle corresponding to the entire arc segment of the rotating fixed arc groove 212 When the degree is 45°, the rotatable range of the rotating shaft 230 is 0 to 45° based on one end of the rotating fixed arc groove 212; when the degree of the central angle corresponding to the entire arc segment of the rotating fixed arc groove 212 is 90°, the rotatable range of the rotating shaft 230 is 0 to 90° based on one end of the rotating fixed arc groove 212; when the degree of the central angle corresponding to the entire arc segment of the rotating fixed arc groove 212 is 180°, the rotatable range of the rotating shaft 230 is 0 to 180° based on one end of the rotating fixed arc groove 212.

[0061] The motor connection structure provided on the eccentric wheel body 210 is mainly used to connect with the output end of the motor 100. The motor connection structure can be various, preferably as follows: Figure 5 and Figure 8 As shown, the motor connection structure includes a drive connection hole 216 arranged at the bottom of the eccentric wheel body 210, a locking screw hole arranged at the side of the lower eccentric wheel 213, and a locking screw 217 threadedly installed in the locking screw hole. The output end of the motor 100 is embedded in the drive connection hole 216 and is tightened by the locking screw 217. The motor connection structure is easy to process and has a good locking effect, which can ensure the effectiveness and stability of the transmission.

[0062] On the basis of the above, in order to further improve the connection and fixing effect, the output end of the motor 100 is set to a structure with a "D"-shaped cross-section, so that the drive connection hole 216 is a "D"-shaped structure that matches the output end of the motor 100, and the locking screw 217 is tightened on the side vertical plane of the output end of the motor 100.

[0063] The bearing 220 is mainly used to install the rotating shaft 230 on the eccentric wheel body 210 in a tight fit manner and ensure that the rotating shaft 230 can rotate; the rotating shaft 230 is a component that can switch the eccentric distance of the eccentric shaft 231 thereon by rotation, and its lower mounting column 232 is mainly used to cooperate with the bearing 220 and serve as a fulcrum for the rotation of the rotating shaft 230, and its guide column 233 is mainly used to cooperate with the rotating fixed arc groove 212 on the eccentric wheel body 210 to guide and limit the rotating shaft 230 when it rotates, and the guide column 233 also has the function of auxiliary support for the rotating shaft 230.

[0064] The eccentric distance between the eccentric shaft 231 and the rotation center of the eccentric wheel assembly is generally determined according to the striking distance of the massage head. For example, when the motor 100 rotates forward, the striking distance of the massage head is 6 mm, and when the motor 100 rotates reversely, the striking distance of the massage head is 9 mm, it can be determined that the difference between e1 and e2 is 3 mm; for another example, when the motor 100 rotates forward, the striking distance of the massage head is 10 mm, and when the motor 100 rotates reversely, the striking distance of the massage head is 6 mm, it can be determined that the difference between e1 and e2 is 4 mm; in order to ensure the massage effect of customers massaging different positions, it is preferred to make the difference between e1 and e2 3 to 4 mm.

[0065] As a preferred embodiment of the present invention, Figure 1 and Figure 2 As shown, the eccentric wheel body 210 includes a lower eccentric wheel 213 and an upper eccentric wheel 214, wherein the upper eccentric wheel 214 is arranged on the upper side of the lower eccentric wheel 213 and fixed by an eccentric wheel connecting member 215; the bearing hole 211 is arranged on the upper part of the upper eccentric wheel 214, the rotating fixed arc groove 212 is arranged on the upper part of the lower eccentric wheel 213, and the motor connecting structure is arranged on the lower eccentric wheel 213;

[0066] The rotating shaft 230 further includes a shaft disc 234, a rotating sleeve 235 and a rotating shaft connecting member 236; the eccentric shaft 231 and the lower mounting column 232 are respectively arranged on the top surface and the bottom surface of the shaft disc 234, and the guide column 233 is arranged on the bottom surface of the rotating sleeve 235;

[0067] The lower mounting column 232 is embedded from the upper end of the inner hole of the bearing 220 , and the rotating sleeve 235 is arranged at the lower side of the bearing 220 and connected to the lower mounting column 232 through a rotating shaft connector 236 .

[0068] In the above embodiments, the eccentric body 210 and the rotating shaft 230 are both configured as split structures, which is to facilitate processing and manufacturing, improve processing efficiency and reduce processing costs, and to facilitate the effective fixing of the rotating shaft 230 to the eccentric body 210, and ensure the stability of the installation of the rotating shaft 230. The eccentric connecting member 215 and the rotating shaft connecting member 236 used to connect and fix the eccentric body 210 and the rotating shaft 230 respectively can be of various types, such as screws, bolts, pins, etc.

[0069] Specifically, Figure 1 As shown, the motor connection structure includes a drive connection hole 216 arranged at the bottom of the lower eccentric wheel 213, a locking screw hole arranged at the side of the lower eccentric wheel 213, and a locking screw 217 threadedly installed in the locking screw hole. The output end of the motor 100 is embedded in the drive connection hole 216 and is tightened by the locking screw 217.

[0070] In order to facilitate the installation of the lower eccentric wheel 213 and the upper eccentric wheel 214 and improve the integrity of the eccentric wheel body 210, the lower eccentric wheel 213 and the upper eccentric wheel 214 are provided with a matching fixing structure. The matching fixing structure can be of various types, such as: positioning columns, positioning protrusions and grooves, etc.; preferably, as Figure 2 As shown, the matching fixing structure includes at least two fixing columns 219 provided on the top surface of the lower eccentric wheel 213 , and fixing holes provided at the lower part of the upper eccentric wheel 214 and matched with the fixing columns 219 .

[0071] In order to ensure the flexibility of the rotation of the rotating shaft 230 of the split structure, Figure 1 As shown, the lower part of the upper eccentric wheel 214 is provided with a rotating sleeve mounting hole 218 corresponding to and communicating with the bearing hole 211, a retaining ring is provided between the rotating sleeve mounting hole 218 and the bearing hole 211, and the rotating sleeve 235 is rotatably arranged in the rotating sleeve mounting hole 218. By providing the rotating sleeve mounting hole 218 and arranging the rotating sleeve 235 therein, the structural compactness of the eccentric wheel assembly can be further improved and the space occupied can be reduced. The retaining ring is mainly used to support the limit bearing 220, which is generally supported at the lower end of the outer ring of the bearing 220. It can be a structure integrated with the upper eccentric wheel 214, or it can be a part such as a retaining ring and a washer arranged in the upper eccentric wheel 214.

[0072] In order to further improve the stability of the rotating shaft 230 and the bearing 220 when they are installed together, so that the eccentric wheel assembly can rotate more stably at high speed, Figure 1 and Figure 2 As shown, a connecting column 237 is provided on the upper portion of the rotating sleeve 235 , which is embedded in the lower end of the inner hole of the bearing 220 and is attached to the bottom surface of the lower mounting column 232 .

[0073] As another preferred embodiment of the present invention, Figure 3 and Figure 4 As shown, the bearing hole 211 is arranged at the upper part of the eccentric wheel body 210, and the rotating fixed arc groove 212 is arranged at the lower part of the eccentric wheel body 210; the rotating shaft 230 also includes a shaft disc 234, a rotating sleeve 235 and a rotating shaft connecting piece 236; the eccentric shaft 231 and the lower mounting column 232 are respectively arranged on the top surface and the bottom surface of the shaft disc 234, and the guide column 233 is arranged on the top surface of the rotating sleeve 235; the lower mounting column 232 is embedded from the upper end of the inner hole of the bearing 220, and the rotating sleeve 235 is arranged on the lower side of the bearing 220 and is connected to the lower mounting column 232 through the rotating shaft connecting piece 236.

[0074] In the above embodiments, the eccentric wheel body 210 is an integral structure, and the bearing hole 211 and the rotating fixed arc groove 212 are respectively arranged at the upper and lower parts of the eccentric wheel body 210, which is convenient for processing and manufacturing, and ensures the integrity and stability of the eccentric wheel body 210; the rotating shaft 230 is set as a split structure, which is convenient for its installation on the eccentric wheel body 210, and is fixed by the lower mounting column 232, the rotating sleeve 235 and the rotating shaft connecting piece 236, so that the inner ring of the bearing 220 can be clamped between the shaft disc 234 and the rotating sleeve 235, thereby realizing the effective fixation of the rotating shaft 230 on the eccentric wheel body 210 and improving the integrity and stability of the eccentric wheel assembly.

[0075] In order to ensure the flexibility of the rotation of the rotating shaft 230 of the split structure, Figure 3 As shown, the lower part of the eccentric body 210 is provided with a rotating sleeve mounting hole 218 corresponding to and communicating with the bearing hole 211, a retaining ring is provided between the rotating sleeve mounting hole 218 and the bearing hole 211, and the rotating sleeve 235 is rotatably arranged in the rotating sleeve mounting hole 218. By providing the rotating sleeve mounting hole 218 and arranging the rotating sleeve 235 therein, the structural compactness of the eccentric assembly can be further improved and its occupied space can be reduced. The retaining ring is mainly used to support the limit bearing 220, which is generally supported at the lower end of the outer ring of the bearing 220. It can be a structure integrated with the eccentric body 210, or it can be a part such as a retaining ring and a washer arranged in the eccentric body 210.

[0076] On the basis of the above, in order to further improve the structural compactness of the eccentric wheel assembly, Figure 3 As shown, the rotation fixing arc groove 212 is arranged on the bottom surface of the retaining ring.

[0077] As another preferred embodiment of the present invention, Figure 5 , Figure 6 and Figure 7As shown, the bearing hole 211 and the rotating fixed arc groove 212 are both arranged on the upper part of the eccentric wheel body 210; the rotating shaft 230 also includes a shaft disk 234, the eccentric shaft 231 is arranged on the top surface of the shaft disk 234, and the lower mounting column 232 and the guide column 233 are both arranged on the bottom surface of the shaft disk 234. In this embodiment, the eccentric wheel body 210 and the rotating shaft 230 are both integral structures, which are simple and convenient to assemble, and have low requirements on the material of parts and components, which is conducive to improving production efficiency and reducing production costs.

[0078] Based on the same inventive concept, the present invention also provides a driving mechanism of a variable amplitude fascia gun, such as Figure 8 and Fig. 9 As shown, it includes a motor 100, an eccentric wheel assembly, a transmission arm 300 and a piston rod 400, and the two ends of the transmission arm 300 are respectively hinged to the eccentric shaft 231 of the eccentric wheel assembly and the tail of the piston rod 400; the eccentric wheel assembly includes an eccentric wheel body 210, a bearing 220 and a rotating shaft 230;

[0079] The eccentric wheel body 210 is provided with a bearing hole 211, a rotation fixed arc groove 212 and a motor connection structure, and the eccentric wheel body 210 is installed on the output end of the motor 100 through the motor connection structure;

[0080] The bearing 220 is an eccentric bearing and is installed in the bearing hole 211;

[0081] The rotating shaft 230 includes an eccentric shaft 231, a lower mounting column 232 and a guide column 233 connected together, wherein the lower mounting column 232 is coaxial with the eccentric shaft 231, and the guide column 233 is not coaxial with the eccentric shaft 231; the rotating shaft 230 is mounted together with the inner hole of the bearing 220 through the lower mounting column 232, and the guide column 233 is embedded in the rotating fixed arc groove 212;

[0082] The lower mounting column 232 can rotate eccentrically with the bearing 220 and drive the guide column 233 to move in the rotating fixed arc groove 212. When the guide column 233 moves to one end of the rotating fixed arc groove 212, the eccentricity between the eccentric shaft 231 and the rotation center of the eccentric wheel body 210 is e1; when the guide column 233 moves to the other end of the rotating fixed arc groove 212, the eccentricity between the eccentric shaft 231 and the rotation center of the eccentric wheel body 210 is e2, and e2≠e1.

[0083] The above driving mechanism can change the position of the rotating shaft 230 after rotation through the forward and reverse rotation of the motor 100, so that the eccentric distance of the eccentric shaft 231 can be switched between e1 and e2, so that the piston rod 400 can produce a massage distance with an amplitude of A1 or A2, A1≠A2; its specific working principle is: since the bearing 220 is an eccentric bearing, when the motor 100 drives the eccentric wheel body 210 to rotate forward, the outer ring of the bearing 220 can be used as the fulcrum for the rotation of the rotating shaft 230, the lower mounting column 232 rotates eccentrically with the inner ring of the bearing 220, and the guide column 233 moves in the rotating fixed arc groove 212. When the guide column 233 moves to one end of the rotating fixed arc groove 212, the rotating shaft 230 is in a forward rotation limit state, so that the motor 100 can drive the entire eccentric wheel The assembly rotates, and drives the transmission arm 300 and the piston rod 400 to move in conjunction, and a massage head is installed on the head of the piston rod 400 to form a percussion massage mode with an amplitude of A1; when the motor 100 drives the eccentric wheel body 210 to reverse, the outer ring of the bearing 220 can be used as the fulcrum for the rotation of the rotating shaft 230, and the lower mounting column 232 rotates eccentrically with the inner ring of the bearing 220, and the guide column 233 moves in the rotating fixed arc groove 212. When the guide column 233 moves to the other end of the rotating fixed arc groove 212, the rotating shaft 230 is in a reverse limit state, so that the motor 100 can drive the entire eccentric wheel assembly to rotate, and drive the transmission arm 300 and the piston rod 400 to move in conjunction, and a massage head is installed on the head of the piston rod 400 to form a percussion massage mode with an amplitude of A2. Since the driving mechanism uses the bearing 220 to tightly fit the rotating shaft 230, it will basically not be loosened during use, the structural stability is high, and the noise and vibration generated when the motor 100 runs at high speed are small. Moreover, the driving mechanism is composed of fewer parts. The rotating shaft 230 only rotates within the arc range of the rotating fixed arc groove 212, and the eccentricity switching can be achieved without forward and backward movement. Therefore, the structure is compact, occupies a small space, is easy to assemble and has high efficiency. In addition, the driving mechanism has low requirements on the material of parts and components. It can be made of metal materials such as iron, copper, aluminum, zinc, etc. according to the required strength of the product, which is conducive to cost saving.

[0084] To facilitate assembly and improve efficiency, such as Figure 8 , Fig. 9 and Fig.10As shown, the bearing hole 211 is arranged on the upper part of the eccentric wheel body 210, and a rotating sleeve hole is provided on the inner bottom surface of the bearing hole 211, and the rotating fixed arc groove 212 is arranged on the inner bottom surface of the rotating sleeve hole; the rotating shaft 230 also includes a shaft disc 234, a rotating sleeve 235 and a rotating shaft connecting piece 236; the eccentric shaft 231 and the lower mounting column 232 are respectively arranged on the top surface and the bottom surface of the shaft disc 234, and the guide column 233 is arranged on the bottom surface of the rotating sleeve 235; the lower mounting column 232 is embedded from the upper end of the inner hole of the bearing 220, and the rotating sleeve 235 is arranged in the rotating sleeve hole and connected with the lower mounting column 232 through the rotating shaft connecting piece 236.

[0085] The present invention also provides a variable amplitude fascia gun with good stability and low noise and vibration, which includes a shell and a driving mechanism of the above-mentioned variable amplitude fascia gun, wherein the driving mechanism is arranged in the shell, the motor 100 is fixedly connected to the shell through a motor fixing bracket 120, and the piston rod 400 is movably connected to the shell through a sliding sleeve 410.

[0086] In order to facilitate regulation, the variable amplitude fascia gun further includes a main control panel; the housing is provided with a motor forward and reverse control switch, and the motor 100 and the motor forward and reverse control switch are electrically connected to the main control panel respectively. When in use, the forward or reverse working mode of the motor 100 is adjusted by the motor forward and reverse control switch, so as to use a long striking distance massage in areas with more muscles and a short striking distance massage in areas with less muscles.

Claims

1. A drive mechanism of a variable amplitude fascia gun, comprising a motor (100), an eccentric wheel assembly, a transmission arm (300) and a piston rod (400), wherein two ends of the transmission arm (300) are respectively hinged to an eccentric shaft (231) of the eccentric wheel assembly and a tail of the piston rod (400); characterized in that: The eccentric wheel assembly comprises an eccentric wheel body (210), a bearing (220) and a rotating shaft (230); The eccentric wheel body (210) is provided with a bearing hole (211), a rotating fixed arc groove (212) and a motor connection structure, and the eccentric wheel body (210) is installed on the output end of the motor (100) through the motor connection structure; The eccentric wheel body (210) comprises a lower eccentric wheel (213) and an upper eccentric wheel (214); the upper eccentric wheel (214) is arranged on the upper side of the lower eccentric wheel (213) and fixed by an eccentric wheel connecting member (215); the bearing hole (211) is arranged on the upper part of the upper eccentric wheel (214); the rotating fixed arc groove (212) is arranged on the upper part of the lower eccentric wheel (213); the motor connecting structure is arranged on the lower eccentric wheel (213); the rotating shaft (230) further comprises a shaft disc (23 4), a rotating sleeve (235) and a rotating shaft connecting piece (236); the eccentric shaft (231) and the lower mounting column (232) are respectively arranged on the top surface and the bottom surface of the shaft disc (234), and the guide column (233) is arranged on the bottom surface of the rotating sleeve (235); the lower mounting column (232) is embedded from the upper end of the inner hole of the bearing (220), and the rotating sleeve (235) is arranged on the lower side of the bearing (220) and connected to the lower mounting column (232) through the rotating shaft connecting piece (236); The bearing hole (211) is arranged at the upper part of the eccentric wheel body (210), and the rotating fixed arc groove (212) is arranged at the lower part of the eccentric wheel body (210); the rotating shaft (230) further comprises a shaft disc (234), a rotating sleeve (235) and a rotating shaft connecting piece (236); the eccentric shaft (231) and the lower mounting column (232) are respectively arranged on the top surface and the bottom surface of the shaft disc (234), and the guide column (233) is arranged on the top surface of the rotating sleeve (235); the lower mounting column (232) is embedded from the upper end of the inner hole of the bearing (220), and the rotating sleeve (235) is arranged on the lower side of the bearing (220) and connected to the lower mounting column (232) through the rotating shaft connecting piece (236); The bearing (220) is installed in the bearing hole (211); The rotating shaft (230) comprises an eccentric shaft (231), a lower mounting column (232) and a guide column (233) which are connected together and are not coaxial with each other. The rotating shaft (230) is mounted together with the inner hole of the bearing (220) through the lower mounting column (232), and the guide column (233) is embedded in the rotating fixed arc groove (212); The guide column (233) can move around the lower mounting column (232) in the rotating fixed arc groove (212); when the guide column (233) moves to one end of the rotating fixed arc groove (212), the eccentricity between the eccentric shaft (231) and the rotation center of the eccentric wheel body (210) is e1; when the guide column (233) moves to the other end of the rotating fixed arc groove (212), the eccentricity between the eccentric shaft (231) and the rotation center of the eccentric wheel body (210) is e2, and e2≠e1.

2. The driving mechanism of the variable amplitude fascia gun according to claim 1, characterized in that: The motor connection structure comprises a drive connection hole (216) arranged at the bottom of the lower eccentric wheel (213), a locking screw hole arranged at the side of the lower eccentric wheel (213), and a locking screw (217) threadedly installed in the locking screw hole, and the output end of the motor (100) is embedded in the drive connection hole (216) and is tightened by the locking screw (217).

3. The driving mechanism of the variable amplitude fascia gun according to claim 1, characterized in that: A rotating sleeve mounting hole (218) corresponding to and communicating with the bearing hole (211) is provided at the lower portion of the upper eccentric wheel (214); a retaining ring is provided between the rotating sleeve mounting hole (218) and the bearing hole (211); and the rotating sleeve (235) is rotatably disposed in the rotating sleeve mounting hole (218).

4. The driving mechanism of the variable amplitude fascia gun according to claim 1, characterized in that: The lower eccentric wheel (213) and the upper eccentric wheel (214) are provided with a matching fixing structure.

5. The driving mechanism of the variable amplitude fascia gun according to claim 4, characterized in that: The matching fixing structure comprises at least two fixing columns (219) arranged on the top surface of the lower eccentric wheel (213), and fixing holes arranged on the lower part of the upper eccentric wheel (214) and matched with the fixing columns (219).

6. The driving mechanism of the variable amplitude fascia gun according to claim 1, characterized in that: A rotating sleeve mounting hole (218) corresponding to and communicating with the bearing hole (211) is provided at the lower portion of the eccentric wheel body (210); a retaining ring is provided between the rotating sleeve mounting hole (218) and the bearing hole (211); and the rotating sleeve (235) is rotatably disposed in the rotating sleeve mounting hole (218).

7. The driving mechanism of the variable amplitude fascia gun according to claim 6, characterized in that: The rotating fixed arc groove (212) is arranged on the bottom surface of the retaining ring.

8. The driving mechanism of the variable amplitude fascia gun according to claim 1, characterized in that: The bearing hole (211) and the rotating fixed arc groove (212) are both arranged on the upper part of the eccentric wheel body (210); the rotating shaft (230) further includes a shaft disk (234), the eccentric shaft (231) is arranged on the top surface of the shaft disk (234), and the lower mounting column (232) and the guide column (233) are both arranged on the bottom surface of the shaft disk (234).

9. The driving mechanism of the variable amplitude fascia gun according to any one of claims 1, 3 or 6, characterized in that: The upper portion of the rotating sleeve (235) is provided with a connecting column (237) which is embedded in the lower end of the inner hole of the bearing (220) and is in contact with the bottom surface of the lower mounting column (232).

10. The driving mechanism of the variable amplitude fascia gun according to any one of claims 1, 6, 7 or 8, characterized in that: The motor connection structure comprises a drive connection hole (216) arranged at the bottom of the eccentric wheel body (210), a locking screw hole arranged at the side of the lower eccentric wheel (213), and a locking screw (217) threadedly installed in the locking screw hole, and the output end of the motor (100) is embedded in the drive connection hole (216) and is tightened by the locking screw (217).

11. The driving mechanism of the variable amplitude fascia gun according to any one of claims 1 to 8, characterized in that: The degree of the central angle corresponding to the entire arc segment of the rotating fixed arc groove (212) is 45° to 180°.

12. The driving mechanism of the variable amplitude fascia gun according to claim 11, characterized in that: The degree of the central angle corresponding to the entire arc segment of the rotating fixed arc groove (212) is 90°.

13. The driving mechanism of the variable amplitude fascia gun according to any one of claims 1 to 8, characterized in that: The difference between e1 and e2 is 3 to 4 mm.

14. A drive mechanism of a variable amplitude fascia gun, comprising a motor (100), an eccentric wheel assembly, a transmission arm (300) and a piston rod (400), wherein two ends of the transmission arm (300) are respectively hinged to an eccentric shaft (231) of the eccentric wheel assembly and a tail of the piston rod (400); characterized in that: The eccentric wheel assembly comprises an eccentric wheel body (210), a bearing (220) and a rotating shaft (230); The eccentric wheel body (210) is provided with a bearing hole (211), a rotationally fixed arc groove (212) and a motor connection structure, and the eccentric wheel body (210) is installed on the output end of the motor (100) through the motor connection structure; the bearing hole (211) is provided on the upper part of the eccentric wheel body (210), the inner bottom surface of the bearing hole (211) is provided with a rotation sleeve hole, and the rotationally fixed arc groove (212) is provided on the inner bottom surface of the rotation sleeve hole; the rotating shaft (230) also includes a shaft disc (234), a rotating sleeve (235) and a rotating shaft connecting piece (236); the eccentric shaft (231) and the lower mounting column (232) are respectively arranged on the top surface and the bottom surface of the shaft disc (234), and the guide column (233) is arranged on the bottom surface of the rotating sleeve (235); the lower mounting column (232) is embedded from the upper end of the inner hole of the bearing (220), and the rotating sleeve (235) is arranged in the rotating sleeve hole and connected with the lower mounting column (232) through the rotating shaft connecting piece (236); The upper part of the rotating sleeve (235) is provided with a connecting column (237) which is embedded in the lower end of the inner hole of the bearing (220) and is in contact with the bottom surface of the lower mounting column (232); The motor connection structure comprises a drive connection hole (216) provided at the bottom of the eccentric wheel body (210), a locking screw hole provided at the side of the lower eccentric wheel (213), and a locking screw (217) threadedly installed in the locking screw hole, and the output end of the motor (100) is embedded in the drive connection hole (216) and is tightened by the locking screw (217); The bearing (220) is an eccentric bearing and is installed in the bearing hole (211); The rotating shaft (230) comprises an eccentric shaft (231), a lower mounting column (232) and a guide column (233) connected together, the lower mounting column (232) and the eccentric shaft (231) are coaxial, and the guide column (233) and the eccentric shaft (231) are not coaxial; the rotating shaft (230) is mounted together with the inner hole of the bearing (220) through the lower mounting column (232), and the guide column (233) is embedded in the rotating fixed arc groove (212); The lower mounting column (232) can rotate eccentrically with the bearing (220) and drive the guide column (233) to move in the rotating fixed arc groove (212); when the guide column (233) moves to one end of the rotating fixed arc groove (212), the eccentric distance between the eccentric shaft (231) and the rotation center of the eccentric wheel body (210) is e1; when the guide column (233) moves to the other end of the rotating fixed arc groove (212), the eccentric distance between the eccentric shaft (231) and the rotation center of the eccentric wheel body (210) is e2, and e2≠e1.

15. The driving mechanism of the variable amplitude fascia gun according to claim 14, characterized in that: The cross section of the output end of the motor (100) is in a "D" shape, the drive connection hole (216) is a "D"-shaped structure matching the output end of the motor (100), and the locking screw (217) is pressed against a vertical plane on the side of the output end of the motor (100).

16. The driving mechanism of the variable amplitude fascia gun according to claim 14, characterized in that: The degree of the central angle corresponding to the entire arc segment of the rotating fixed arc groove (212) is 45° to 180°.

17. The driving mechanism of the variable amplitude fascia gun according to claim 16, characterized in that: The degree of the central angle corresponding to the entire arc segment of the rotating fixed arc groove (212) is 90°.

18. The driving mechanism of the variable amplitude fascia gun according to claim 14, characterized in that: The difference between e1 and e2 is 3 to 4 mm.

19. A variable amplitude fascia gun, comprising a housing, characterized in that: It also includes a drive mechanism of the variable amplitude fascia gun as described in any one of claims 1 to 18, wherein the drive mechanism is arranged in a shell, the motor (100) is fixedly connected to the shell via a motor fixing bracket (120), and the piston rod (400) is movably connected to the shell via a sliding sleeve (410).

20. The variable amplitude fascia gun according to claim 19, characterized in that: The housing also includes a main control board; a motor forward and reverse rotation control switch is arranged on the housing; the motor (100) and the motor forward and reverse rotation control switch are electrically connected to the main control board respectively.

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