High-frequency reciprocating rotary electric toothbrush rod

Abstract

Provided is a high-frequency reciprocating rotary electric toothbrush rod, mounted at the front end of an electric toothbrush and comprising a brush rod housing (41), an inner support (47), a rotary brush head assembly, and a power transmission assembly. The rear portion of the brush rod housing (41) is formed in a horn shape and accommodates the inner support (47), the inner support (47) is in a horn shape matching an inner cavity of the brush rod housing (41) and is hollow inside to form an inner space for accommodating the power transmission assembly, and the front end of the brush rod housing (41) forms a circular recess for accommodating the rotary brush head assembly. The rotary brush head assembly comprises a brush head base (421) and rotary bristles (422). The brush head base (421) is rotatably disposed in the circular recess at the front end of the brush rod housing (41), a plurality of rotary bristles (422) for cleaning are implanted at the upper end, and a seat is disposed at the lower end. The power transmission assembly comprises a swing rod (43), an elastic support (44), an elastic coupling body (45), a driving head (46), a compensation spring (48), and a connecting sleeve (49). The front end of the swing rod (43) is provided with the driving head (46) for driving the brush head base (421). The middle part of the swing rod (43) is elastically supported on the inner wall of the front end of the inner support (47) by means of the elastic support (44). The compensation spring (48) sleeves the part of the swing rod (43) between the driving head (46) and the elastic support (44). The connecting sleeve (49) is embedded into the rear end of the inner support (47). The rear end of the swing rod (43) extends into the front end of the connecting sleeve (49). The rear end of the connecting sleeve (49) is connected to an output shaft (245) of a swing motor (20) through the elastic coupling body (45) so as to transmit power.

Description

High-frequency reciprocating electric toothbrush handle Technical Field

[0001] This invention relates to the technical field of electric toothbrushes, and more particularly to a high-frequency reciprocating electric toothbrush handle capable of operating in a wide frequency range of 140-350Hz with high oscillation frequency. Background Technology

[0002] Electric toothbrush heads can be divided into two main categories based on their operating mechanism: those that rotate or those that vibrate. The main design challenges in the rotating brush head type are as follows:

[0003] The higher the rotation speed, the louder the noise. The rotation frequency of a regular brush head is less than 133Hz. Factors affecting the lifespan of a brush head include: brush head structure, size, material, rotation speed, output torque, and toothpaste abrasive. The structure of the brush head directly affects its lifespan. During brushing, toothpaste, tooth powder, and other cleaning abrasives need to be added, which will drastically shorten the lifespan of the toothbrush head due to the wear and tear of the structural components.

[0004] Moreover, the existing brush head structure is complex and the manufacturing cost is correspondingly higher, placing a heavy burden on consumers.

[0005] Therefore, in view of the above-mentioned defects, the designers of this invention, through dedicated research and design, and by integrating years of experience and achievements in related industries, have researched and designed a high-frequency reciprocating electric toothbrush handle to overcome the above-mentioned defects. Summary of the Invention

[0006] The purpose of this invention is to provide a high-frequency reciprocating electric toothbrush handle that overcomes the shortcomings of the prior art, can effectively work up to the 350Hz high frequency band, still maintains excellent cleaning ability with high swing amplitude, and has the characteristics of low noise, long life, simple structure, and good economy.

[0007] To achieve the above objectives, this invention discloses a high-frequency reciprocating rotary electric toothbrush handle, which is mounted on the front end of an electric toothbrush and includes a handle housing, an inner support, a rotating brush head assembly, and a power transmission assembly. The rear part of the handle housing is formed in a trumpet shape and accommodates the inner support. The inner support is trumpet-shaped and adapted to the inner cavity of the handle housing to form an inner space for the built-in power transmission assembly. The front end of the handle housing forms a circular groove for accommodating the rotating brush head assembly. The invention is characterized by:

[0008] The rotating brush head assembly includes a brush head base and rotating bristles. The brush head base is rotatably disposed in a circular groove at the front end of the brush handle housing. Multiple rotating bristles for cleaning are embedded at its upper end, and a base is provided at its lower end.

[0009] The power transmission assembly includes a swing arm, an elastic fulcrum, an elastic coupler, and a connecting sleeve. The front end of the swing arm is provided with a drive head for driving the brush head seat. The middle part of the swing arm is elastically supported on the inner bracket through the elastic fulcrum. The rear end of the swing arm extends into the front end of the connecting sleeve. The rear end of the connecting sleeve is connected to the elastic coupler to transmit power.

[0010] Wherein: the electric toothbrush includes a body shell, the body shell is hollow to form an internal space, the front end of the internal space of the body shell is provided with a oscillating motor as the main unit, the output shaft of the oscillating motor extends from the front end of the body shell and is connected to an elastic coupler to provide power output, and the rear end of the internal space is provided with a battery.

[0011] It also includes a rotating assembly, which comprises a fixing frame, a rotating shaft, and a safety pin. The base of the brush head seat is through which the fixing frame passes. The side of the fixing frame is fixed to the brush rod housing by the safety pin. The middle of the fixing frame is provided with a through hole for the rotating shaft to pass through. Both ends of the rotating shaft can rotatably extend into the brush head seat, so that the brush head seat can rotate within the circular groove through the power transmission of the rotating power assembly.

[0012] Wherein: the safety pin is perpendicular to the axis of the rotating shaft, and the safety pin passes through the transverse hole on the brush rod housing and the hole on the side of the fixing frame to form a transverse lock to securely lock the rotating brush head assembly to the brush rod housing.

[0013] Wherein: a compensation spring pad is provided between the base of the brush head holder and the outer shell of the brush rod to provide compensation during rotational movement.

[0014] Wherein: the front end of the connecting sleeve is tightly fitted with the rear end of the swing rod, the rear end of the connecting sleeve accommodates the elastic coupling body, the middle part of the elastic coupling body is provided with a concave inner ring protrusion, the connecting sleeve is provided with a corresponding inner protrusion that extends into the concave space of the elastic coupling body, or the outer edge of the elastic coupling body corresponding to the inner ring protrusion is provided with an outer protrusion that extends into a hollow groove of the connecting sleeve.

[0015] Wherein: the middle part of the elastic fulcrum is provided with a concave ring, the front end of the inner support is provided with a concave convex part that extends into the concave space of the elastic fulcrum, the concave ring is closely fitted with the middle part of the swing rod, and the outer edge of the elastic fulcrum is also in contact with the inner support, so that the swing rod swings with the elastic fulcrum as the fulcrum.

[0016] Wherein: The swing arm is fitted with a compensating spring between the drive head and the elastic fulcrum. The free length of the compensating spring is greater than the distance between the elastic fulcrum and the drive head. Therefore, when the compensating spring is compressed, it will generate a constant reaction force to push the drive head towards the brush head seat, so that the two are in close contact at any time. This can eliminate the gap between the two at any time, effectively stabilize the output angle and torque, reduce noise, and effectively improve the service life.

[0017] Wherein: the driving head is a convex head, and the base of the brush head seat is provided with a groove that meshes with the convex head. The convex head and the groove are involute teeth, which ensures that the meshing friction type of the whole process is rolling friction.

[0018] Wherein: the front end of the drive head is formed as an active groove, a cylindrical protrusion or a U-shaped groove, and the brush head seat is provided with a corresponding passive protrusion, a receiving groove or a passive cylinder.

[0019] As can be seen from the above, the high-frequency reciprocating electric toothbrush handle of the present invention has the following effects:

[0020] 1. The structure of this invention can effectively compensate for the gap after wear, and solve the problems of lifespan and noise at high speeds.

[0021] 2. In this invention, the pivot point of the swing arm adopts a flexible structure in the shaft connection, which not only solves the power coupling requirements, but also solves the problem caused by the gap. In addition, it has a good noise absorption effect on the mutual collision of components during the movement, and maintains the advantage of low operating noise.

[0022] 3. It has a simple structure, low manufacturing cost, and excellent economic efficiency.

[0023] The details of this invention will become apparent from the following description and the accompanying drawings. Attached Figure Description

[0024] Figure 1 shows a schematic diagram of the overall structure of the high-frequency reciprocating electric toothbrush handle of the present invention.

[0025] Figure 2 shows an exploded structural diagram of the high-frequency reciprocating electric toothbrush handle of the present invention.

[0026] Figure 3 shows a cross-sectional view of the high-frequency reciprocating electric toothbrush handle of the present invention.

[0027] Figure 4 shows an internal schematic diagram of the high-frequency reciprocating electric toothbrush handle of the present invention.

[0028] Figures 5A, 5B, and 5C respectively show schematic diagrams of the three operating states of the high-frequency reciprocating electric toothbrush handle of the present invention.

[0029] Figure 6 shows a schematic diagram of the brush head holder in this invention.

[0030] Figure 7 shows a partial cross-sectional view of the elastic coupler in this invention.

[0031] Figure 8 shows a partial cross-sectional view of the elastic fulcrum in this invention.

[0032] Figure 9 shows a schematic diagram of the internal structure of another embodiment of the high-frequency reciprocating electric toothbrush handle of the present invention.

[0033] Figures 10A and 10B show schematic diagrams of the compensating spring of the rotating brush rod in this invention.

[0034] Figures 11A and 11B show schematic diagrams of another embodiment of the present invention.

[0035] Figures 12A and 12B show schematic diagrams of another embodiment of the present invention.

[0036] Figures 13A, 13B, 13C and 13D show schematic diagrams of another embodiment of the present invention.

[0037] Figures 14A and 14B show schematic diagrams of the operation in which the output shaft's motion trajectory is an arc-shaped circle in this invention.

[0038] Figures 15A and 15B show schematic diagrams of the operation in which the output shaft's motion trajectory is a reciprocating parallel line in this invention.

[0039] Figure 16 shows a schematic diagram of the structure of the present invention applied to an electric toothbrush.

[0040] Reference numerals: 10. Main body housing; 11. Tail cap; 12. Function button; 13. Control circuit board; 20. Swing motor; 30. Battery; 41. Brush rod housing; 421. Brush head holder; 422. Rotating bristles; 423. Fixing frame; 424. Rotating shaft; 425. Safety pin; 426. Compensating spring pad; 43. Swing rod; 44. Elastic fulcrum; 45. Elastic coupling body; 46. Drive head; 47. Inner support; 48. Compensating spring; 49. Connecting sleeve. Detailed Implementation

[0041] Referring to Figures 1, 2, 3, and 4, the high-frequency reciprocating electric toothbrush handle of the present invention is shown. Figure 1 shows an overall structural schematic diagram of the high-frequency reciprocating electric toothbrush handle of the present invention. Figure 2 shows an exploded structural schematic diagram of the high-frequency reciprocating electric toothbrush handle of the present invention. Figure 3 shows a cross-sectional view of the high-frequency reciprocating electric toothbrush handle of the present invention. Figure 4 shows an internal structural schematic diagram of the high-frequency reciprocating electric toothbrush handle of the present invention.

[0042] As shown in Figures 1, 2, and 3, the high-frequency reciprocating electric toothbrush handle includes a brush handle housing 41, an inner support 47, a rotating brush head assembly, and a power transmission assembly. The brush handle housing 41 is hollow and its rear end is detachably connected to the main unit of the electric toothbrush. The rear part of the brush handle housing 41 is formed into a trumpet shape and accommodates the inner support 47. The inner support 47 is trumpet-shaped and hollow, adapted to the inner cavity of the brush handle housing 41, to form an inner space for the built-in power transmission assembly. The front end of the brush handle housing 41 forms a circular groove for accommodating the rotating brush head assembly.

[0043] Referring to the installation diagram in Figure 16, a specific embodiment of the high-frequency reciprocating electric toothbrush handle of the present invention is applied to a high-frequency power multi-mode electric toothbrush. In this embodiment, the electric toothbrush also includes a main body housing 10, a oscillating motor 20, and a battery 30. The main body housing 10 is hollow to form an internal space, and its rear end is closed by a detachable tail cap 11. The main body housing 10 contains a control circuit board 13, and multiple function buttons 12 connected to the control circuit board 13 are provided on the side wall. Thus, the operator can provide control signals to the control circuit board 13 through the function buttons 12 to control the electric toothbrush. The oscillating motor 20 is provided at the front end of the internal space of the main body housing 10. The output shaft 245 of the oscillating motor 20 extends from the front end of the main body housing 10 to provide power output. The battery 30 is provided at the rear end of the internal space. The battery 30 is electrically connected to the control circuit board 13 and the oscillating motor 20 to provide a stable and reliable power output for both.

[0044] The rear end of the brush rod housing 41 is detachably connected to the front end of the main body housing 10. The rear end of the power transmission assembly is connected to the output shaft 245 of the oscillating motor 20, and the front end is connected to the rotating brush head assembly, thereby transmitting the output power of the oscillating motor 20 to the rotating brush head assembly.

[0045] Specifically, the rotating brush head assembly includes a brush head base 421 and rotating bristles 422. The brush head base 421 is rotatably disposed in a circular groove at the front end of the brush handle housing 41. Multiple rotating bristles 422 for cleaning are embedded at its upper end, and a base is provided at its lower end. In the illustrated embodiment, the brush head base 421 is connected to the brush handle housing 41 via a rotating assembly. The rotating assembly includes a fixing frame 423, a rotating shaft 424, and a safety pin 425. The base of the brush head base 421 provides a fixing frame. 423 is a through hole. The side of the fixing frame 423 is fixed to the brush rod housing 41 by a safety pin 425. The middle of the fixing frame 423 is provided with a through hole for the rotating shaft 424 to pass through. Both ends of the rotating shaft 424 extend into the brush head seat 421. Thus, the fixing frame 423 is fixed to the brush rod housing 41 by the safety pin 425, while the brush head seat 421 rotates relative to the fixing frame 423. This allows the brush head seat 421 to rotate within the circular groove through the power transmission of the rotating power assembly.

[0046] Optionally, a compensation spring pad 426 is provided between the base of the brush head holder 421 and the brush rod housing 41 to provide compensation during rotational movement.

[0047] The power transmission assembly includes a rocker arm 43, an elastic fulcrum 44, an elastic coupling body 45, a drive head 46, a compensating spring 48, and a connecting sleeve 49. The front end of the rocker arm 43 is provided with a drive head 46 for driving the brush head seat 421. In the embodiments shown in Figures 2 to 4, the drive head 46 is a protruding head. Referring also to Figure 6, the base of the brush head seat 421 is provided with a groove 4211 that meshes with the protruding head, so that the protruding head of the drive head 46 can extend into and engage with the teeth. The groove 4211 enables power transmission between the two components. The middle part of the swing rod 43 is elastically supported on the inner wall of the front end of the inner bracket 47 by the elastic fulcrum 44. A compensating spring 48 is sleeved between the drive head 46 and the elastic fulcrum 44. The connecting sleeve 49 is embedded in the rear end of the inner bracket 47. The rear end of the swing rod 43 extends into the front end of the connecting sleeve 49. The rear end of the connecting sleeve 49 is connected to the output shaft 245 of the swing motor through the elastic coupling body 45 to transmit power.

[0048] Therefore, the brush head seat of the rotating brush bar is circular or elliptical. The movement of the brush head seat is a rotary joint, and the center of rotation is the center of the brush head seat around the rotation axis 424. The circular brush head seat moves in the form of reciprocating rotations in opposite directions. The rotation angle range is usually 10-120 degrees, and the conventional reciprocating rotation frequency is 80-130Hz.

[0049] In the specific embodiments shown in Figures 2 to 4, the rotating brush bar can reliably operate in the 80-350Hz range and maintain an effective load swing angle of more than 20 degrees.

[0050] The free length of the compensation spring 48 is greater than the distance between the driving member and the elastic fulcrum 44. When the compensation spring 48 is compressed, it generates a reaction force that pushes the driving member toward the brush head seat. The connecting sleeve 49 can be a trumpet-shaped sleeve. The elastic coupling body 45 is a through-hole elastic body. The protruding end of the output shaft 245 is contained by the elastic coupling body 45.

[0051] Thus, as shown in Figures 5A, 5B, and 5C, when the output shaft oscillates, the power is coupled through the connecting sleeve 49 and the elastic coupling body 45. The swing arm rotates around the elastic fulcrum 44, and the rotation of the swing arm drives the drive component 46 to follow suit. The drive component 46 further drives the bristle seat to rotate at high speed. When the swing arm oscillates in the opposite direction, the direction of motion of the brush head seat also changes in the opposite direction. The oscillation of the swing arm in both directions constitutes a complete motion cycle. The mechanical principle of the swing arm's action on the brush head seat is essentially a simple lever principle. The position of the elastic fulcrum at the top of the inner support determines the magnitude of the brush head output swing angle and output torque. The closer the elastic fulcrum is to the brush head, the smaller the brush head seat swing angle and the greater the brush head seat torque; conversely, the further away the elastic fulcrum is, the larger the brush head seat swing angle and the smaller the brush head torque.

[0052] As shown in Figure 7, in a preferred embodiment of the present invention, the front end of the connecting sleeve 49 is tightly fitted with the rear end of the swing rod 43, and the rear end accommodates an elastic coupling body 45. The elastic coupling body 45 has a concave inner ring 451 in the middle, and the connecting sleeve 49 has a corresponding inner protrusion that extends into the concave space of the elastic coupling body 45. The fit between the inner ring 451 and the inner protrusion can better cooperate with the output shaft of the swing motor for power transmission.

[0053] As shown in Figure 8, in a preferred embodiment of the present invention, the elastic fulcrum 44 is provided with a concave ring 441 in the middle, and the front end of the inner support 47 is provided with a concave convex part that extends into the concave space of the elastic fulcrum 44. Thus, the concave ring 441 of the elastic fulcrum 44 is tightly fitted with the middle part of the swing rod 43, and the outer edge of the elastic fulcrum 44 is also in contact with the inner support 47, so that the swing rod 43 can swing stably with the elastic fulcrum 44 as the fulcrum.

[0054] In another embodiment shown in Figure 9, a different form of the power transmission component of the high-frequency reciprocating electric toothbrush handle of the present invention is illustrated. In this embodiment, the structure of the connecting sleeve 49' and the elastic coupling body 45' differs from that in Figures 1 to 4. In the embodiment of Figure 9, the elastic coupling body 45' has an outer protrusion corresponding to the outer edge of the concave annular protrusion 451 to extend into a hollow groove of the connecting sleeve 49', so as to achieve stable coupling between the connecting sleeve 49' and the elastic coupling body 45'. This structure can better achieve power coupling between the connecting sleeve 49' and the elastic coupling body 45'.

[0055] As shown in Figures 10A and 10B, a compensating spring 48 is installed between the elastic fulcrum and the drive head. The free length L2 of the compensating spring 48 is greater than the distance L1 between the elastic fulcrum and the drive head. Therefore, when the compensating spring 48 is compressed, it will generate a constant reaction force that pushes the drive head towards the brush head seat, ensuring that the two are in close contact at any given time. This allows for the elimination of the gap between the two at any given time. Thus, the compensating spring 48 can be referred to as an elastic compensation gap elimination mechanism. This elastic compensation gap elimination mechanism will improve performance under the following operating conditions:

[0056] 1. During brushing, the brush head holder may lose contact with the drive head due to load changes, creating a gap. At this moment, the elastic compensation gap elimination mechanism will activate, pressing the contact surface together under the reaction force of the compensation spring.

[0057] 2. During user use, the rolling friction between the drive head and the brush head seat caused by the abrasive in the toothpaste will cause wear on the mating surfaces and will also lead to the formation of a clearance. At this time, the elastic compensation clearance elimination mechanism will come into play.

[0058] 3. During user use, the brush head holder spindle and spindle fixing bracket will also experience wear due to the abrasive action of toothpaste, resulting in a clearance. Due to the existence of the compensating spring reaction force, the worn components will be tightened, thus solving the noise and abnormal sounds caused by the impact of the gap between high-speed moving components.

[0059] 4. The rocker arm and drive head are separate components. In the actual manufacturing and assembly process, there will be tolerances, which will cause gaps in the fit. At this time, the elastic compensation gap elimination mechanism will come into play.

[0060] 5. There may be errors between the theoretical design of the shape and the actual manufacturing. These errors may also cause gaps in the fit between the protrusion and the groove of the brush head seat. At this time, the elastic compensation gap elimination mechanism will come into play.

[0061] In summary, the elastic compensation and backlash elimination mechanism formed by the compensating spring 48 can effectively stabilize the output angle and torque during brushing, reduce noise, and effectively improve service life.

[0062] Even more preferably, since the brush handle's moving parts operate under conditions of toothpaste abrasive slurry for extended periods, in addition to selecting high-wear-resistant materials for the components, a well-designed meshing profile between the drive head and the brush head holder should theoretically ensure maximum meshing area throughout the entire motion cycle. This helps reduce meshing pressure and improves wear resistance. Furthermore, it should maximize rolling friction between the meshing surfaces throughout the entire friction cycle, minimizing sliding friction, thus further enhancing wear resistance.

[0063] In a further preferred embodiment, a conventional involute profile curve is preferred to solve the above problems. The protrusion and groove 4211 are involute tooth profiles, thereby ensuring that the meshing friction type throughout the process is rolling friction. To maximize the meshing area, the largest module and the largest tooth thickness are selected as much as possible.

[0064] In this embodiment, besides using an involute tooth profile to solve the meshing problem between the protrusion and groove of the brush handle, other contour shapes can also be used, such as a cylindrical protrusion and a trapezoidal groove. Because this invention incorporates a compensating spring, a constant force pushes the protrusion towards the brush head seat. Theoretically, there is no gap during the entire movement of the protrusion and the meshing with the groove. However, compared to the involute tooth profile, its movement involves sliding friction, therefore its theoretical lifespan is shorter.

[0065] Regarding the implementation of the driving head and passive component discussed in this invention, the actual design requirements can be considered. As shown in the embodiments of Figures 11A and 11B, the front end of the driving head 46 can be formed as an active groove 46', and the brush head seat 42 is provided with a corresponding passive boss 4212. The active groove 46' of the driving head 46 can be a single tooth or multiple teeth. Such variations in form fall within the scope of this invention.

[0066] In another embodiment of Figures 12A and 12B, the head of the drive head 46 is formed with a cylindrical protrusion 46”, and the brush head seat 42 is provided with a corresponding receiving groove 4213, and the front end of the cylindrical protrusion 46” is formed into a cylindrical shape.

[0067] In another embodiment of Figures 13A, 13B, 13C and 13D, the head of the drive head 46 is formed with a U-shaped groove 46”', and the brush head seat 42 is provided with a corresponding passive cylinder 4214.

[0068] The base of the brush head holder 421 is a frame that can accommodate the fixing frame 423. After the fixing frame is correctly installed, it penetrates the brush head base. The rotating shaft 424 is fitted with the fixing frame by interference fit, with no relative movement. After the two ends of the rotating shaft 424 extend out, they are fitted with the base by clearance fit, forming two independent coaxial rotating motion pairs.

[0069] The safety pin 425 is perpendicular to the axis of the rotating shaft 424. The rotating brush head assembly is securely locked to the brush rod housing by transverse locking through the transverse hole on the brush rod housing 41 and the hole on the side of the fixing bracket 423. The reason for this transverse device of the safety pin is to prevent the main body from falling vertically, causing the safety pin to be impacted, resulting in unsafe damage such as cracking, loosening, denting, etc., which could lead to the risk of the brush head assembly falling off.

[0070] As shown in Figures 14A and 14B, Figure 14A is a schematic diagram of the output shaft of the oscillating motor in the present invention in a stationary state, and Figure 14B is a schematic diagram of the output shaft swinging left and right. The output shaft swings around the origin O, P1 and P2 are the extreme positions of the two ends that can swing, A is the maximum swing angle, and B represents the arc-shaped motion trajectory formed by the coupling point under the swing. Thus, the motion trajectory of the power coupling point (output shaft) at the rear end of the swing shaft 53 is an arc circle, which coincides with the rotation center.

[0071] As shown in Figures 15A and 15B, Figure 15A is a schematic diagram of the output shaft in a stationary state, and Figure 15B shows a schematic diagram of the output shaft swinging left and right. The output shaft in the figure moves in parallel motion, not in an arc, which is another example of the oscillating motor mentioned in this invention. Whether the motor shaft swings or oscillates parallel, it can meet the requirements of the toothbrush head driving power source mentioned in this invention. P1 and P2 are the extreme positions of the parallel oscillation, and D is the stroke of the oscillation.

[0072] Therefore, the main working mechanism of this invention is as follows:

[0073] 1. The main unit of the electric toothbrush provides reciprocating oscillation torque through the output shaft. The trumpet-shaped sleeve at the end of the swing arm, the embedded connecting sleeve 49, and the elastic coupling body 45 form a coupling. The output shaft of the main unit achieves power coupling with the inner hole of the connecting sleeve 49 and the elastic coupling body 45, which are made of elastic material, thereby driving the swing arm to oscillate back and forth.

[0074] 1.1 The elastic coupling body 45 is designed with a concave ring 451 in the middle. The entire main shaft extends into the concave ring 451 and makes line contact with it to achieve no interference during the swing process and ensure effective power coupling.

[0075] 1.2 The connecting sleeve 49 and the elastic coupling body 45 can also be made of rigid plastic or other materials. In this embodiment of the invention, an elastic material is selected, which can effectively absorb the noise generated by the impact force of the swing arm on the swing arm when the main unit output shaft swings and reverses.

[0076] 1.3 The hardness of the connecting sleeve 49 and the elastic coupling body 45 needs to be moderate; if it is too low, it will affect the dynamic coupling effect of the swing arm, sacrificing the final output torque performance of the brush head seat.

[0077] 2. The elastic fulcrum at the middle of the swing arm and the top of the inner bracket forms a lever fulcrum. When the coupling swings, the drive head at the other end of the swing arm swings in the opposite direction. The drive head and the brush head seat interlock, ultimately driving the brush head to swing around the central rotation axis.

[0078] 2.1 A concave ring 441 with a convex annular surface is set inside the elastic fulcrum constituting the fulcrum. The minimum diameter of the convex surface of the concave ring 441 is slightly larger than or equal to the outer diameter of the rocker arm, so as to allow the rocker arm to slide axially within the hole. The concave ring 441 can effectively prevent interference with the bushing during the swing of the rocker arm, thus avoiding loss of power.

[0079] 2.2 The material for the elastic fulcrum can also be rigid plastic. This embodiment of the invention specifically uses an elastic rubber body to effectively buffer and absorb noise and abnormal sounds generated by the collision of components due to gaps during swinging. The hardness of the elastic fulcrum should be moderate and not too low; otherwise, excessive deformation of the elastic body under heavy load will cause significant changes in the fulcrum position or displacement, resulting in a loss of the swing stroke and insufficient power at the end of the swing arm. This embodiment of the invention preferably uses nitrile rubber with a hardness of 80-90 degrees to make the elastic fulcrum.

[0080] 3. In one embodiment, the protrusion is enclosed by the groove of the brush head seat. When the protrusion swings, the groove is pushed and displaced. Since the brush head seat has a rotating shaft 424 forming a rotating pair, the displacement of the groove is ultimately manifested as the repeated rotation of the brush head causing the brush bristles on the brush head to rotate and swing.

[0081] 3.1 Theoretically, the ideal fit between the boss and the groove should be a seamless match throughout the entire reciprocating oscillation process. The friction between the surface of the boss and the groove of the brush head seat should be rolling friction, not sliding friction. In this case, material wear caused by dynamic coupling is minimized, and coupling power loss is minimized. In this embodiment of the invention, a traditional involute tooth shape is preferred to achieve the envelope shape of the boss and groove fit. The center of the pitch circle of the boss is the fulcrum of the swing arm, which is also the annular boss of the elastic body at the top of the inner support of the brush arm. The central axis of the brush head seat is the center of the pitch circle of the groove in the brush head seat. The ratio of the pitch circle of the boss to the pitch circle of the brush head seat determines the torque transformation ratio of the dynamic coupling, ultimately affecting the swing angle and output torque of the brush head seat. Theoretically, the distance from the fulcrum of the swing arm to the fit point of the boss is directly proportional to the swing angle of the brush head seat and inversely proportional to the output torque of the brush head seat.

[0082] 3.2 The fit between the boss and the brush head seat groove adopts an involute envelope, and ideally, the entire reciprocating motion matching process is a gapless fit. Therefore, theoretically, the operating noise caused by the gap in the fit between the boss and the brush head groove can be completely eliminated.

[0083] 3.3 The boss and groove of the present invention can be selected to have a single tooth or multiple tooth engagement. In the embodiments of the present invention, considering wear resistance and the applicable brush head seat swing angle range, a single boss and a single groove structure for the brush head seat is preferred. This can maximize the tooth profile module and improve the actual strength and wear resistance of the boss.

[0084] 3.4 In this embodiment of the invention, in order to improve the wear resistance of the fit between the boss and the brush head seat, the tooth thickness of the boss is increased as much as possible to reduce the interaction pressure of the surface area. Working space for the thick teeth is reserved in the design.

[0085] 4. In the embodiments of the pendulum rod mentioned in this invention, a stainless steel rod with good rigidity is preferred. During the implementation and verification process, it was found that if the rigidity of the pendulum rod is insufficient, under the action of high-frequency oscillation force, the flexural resonance deformation of the pendulum rod will partially offset the swing angle, which will ultimately result in a smaller swing angle and output torque of the brush head, thus losing the expected performance.

[0086] 5. In this embodiment of the invention, the safety pin device is perpendicular to the axis of the brush handle, rather than being coaxial as in the traditional method. This effectively prevents the safety pin from collapsing towards the main axis of the brush head holder due to direct impact force when the brush head falls to the ground, causing the brush head holder to break or the safety pin hole to crack, thus posing a safety risk of the brush head holder falling off during use. The perpendicular mounting of the safety pin to the brush shaft effectively avoids these problems and improves the safety factor of the brush head holder under various operating conditions.

[0087] It is obvious that the above description and account are merely illustrative and not intended to limit the disclosure, application, or use of this invention. Although embodiments have been described and illustrated in the accompanying drawings, the invention is not limited to the specific examples exemplified by the drawings and described in the embodiments as currently considered the best mode for carrying out the teachings of the invention. The scope of the invention will include any embodiments falling within the foregoing description and the appended claims.

Claims

1. A high-frequency reciprocating rotary electric toothbrush handle, mounted on the front end of an electric toothbrush and comprising a handle housing, an inner support, a rotating brush head assembly, and a power transmission assembly, wherein the rear portion of the handle housing is flared and accommodates the inner support, the inner support being flared to fit the inner cavity of the handle housing to form an internal space for the built-in power transmission assembly, and the front end of the handle housing forms a circular groove for accommodating the rotating brush head assembly, characterized in that: The rotating brush head assembly includes a brush head base and rotating bristles. The brush head base is rotatably disposed in a circular groove at the front end of the brush handle housing. Multiple rotating bristles for cleaning are embedded at its upper end, and a base is provided at its lower end. The power transmission assembly includes a swing arm, an elastic fulcrum, an elastic coupler, and a connecting sleeve. The front end of the swing arm is provided with a drive head for driving the brush head seat. The middle part of the swing arm is elastically supported on the inner bracket through the elastic fulcrum. The rear end of the swing arm extends into the front end of the connecting sleeve. The rear end of the connecting sleeve is connected to the elastic coupler to transmit power.

2. The high-frequency reciprocating electric toothbrush handle as described in claim 1, characterized in that: The electric toothbrush includes a body shell, which is hollow to form an internal space. A oscillating motor, which serves as the main unit, is located at the front end of the internal space of the body shell. The output shaft of the oscillating motor extends from the front end of the body shell and is connected to an elastic coupler to provide power output. A battery is located at the rear end of the internal space.

3. The high-frequency reciprocating electric toothbrush handle as described in claim 1, characterized in that: It also includes a rotating assembly, which includes a fixing frame, a rotating shaft and a safety pin. The base of the brush head seat is through which the fixing frame passes. The side of the fixing frame is fixed to the brush rod housing by the safety pin. The middle of the fixing frame is provided with a through hole for the rotating shaft to pass through. The two ends of the rotating shaft can be rotatably inserted into the brush head seat, so that the brush head seat rotates in the circular groove through the power transmission of the rotating power assembly.

4. The high-frequency reciprocating electric toothbrush handle as described in claim 3, characterized in that: The safety pin is perpendicular to the axis of the rotating shaft. The safety pin passes through the transverse hole on the brush handle housing and the hole on the side of the fixing frame to form a transverse locking mechanism to securely lock the rotating brush head assembly to the brush handle housing.

5. The high-frequency reciprocating electric toothbrush handle as described in claim 1, characterized in that: A compensating spring pad is provided between the base of the brush head holder and the outer shell of the brush rod to provide compensation during rotational movement.

6. The high-frequency reciprocating electric toothbrush handle as described in claim 1, characterized in that: The front end of the connecting sleeve is tightly fitted with the rear end of the swing rod. The rear end of the connecting sleeve accommodates an elastic coupling body. The middle part of the elastic coupling body is provided with a concave inner ring protrusion. The connecting sleeve is provided with a corresponding inner protrusion that extends into the concave space of the elastic coupling body, or the outer edge of the elastic coupling body is provided with an outer protrusion that extends into a hollow groove of the connecting sleeve.

7. The high-frequency reciprocating electric toothbrush handle as described in claim 1, characterized in that: The elastic fulcrum has a concave ring in the middle, and the front end of the inner support has a corresponding convex part that extends into the concave space of the elastic fulcrum. The concave ring is tightly fitted with the middle of the swing rod, and the outer edge of the elastic fulcrum is also in contact with the inner support, so that the swing rod swings with the elastic fulcrum as the fulcrum.

8. The high-frequency reciprocating rotary electric toothbrush handle as described in any one of claims 1-7, characterized in that: The swing arm has a compensating spring sleeved between the drive head and the elastic fulcrum. The free length of the compensating spring is greater than the distance between the elastic fulcrum and the drive head. Therefore, when the compensating spring is compressed, it will generate a constant reaction force to push the drive head towards the brush head seat, so that the two are in close contact at any time. This can eliminate the gap between the two at any time, effectively stabilize the output angle and torque, reduce noise, and effectively improve the service life.

9. The high-frequency reciprocating electric toothbrush handle as described in claim 1, characterized in that: The drive head is a convex head, and the base of the brush head seat is provided with a groove that meshes with the convex head. The convex head and the groove are involute teeth, which ensures that the meshing friction type is rolling friction throughout the process.

10. The high-frequency reciprocating electric toothbrush handle as described in claim 1, characterized in that: The front end of the drive head is formed as an active groove, a cylindrical protrusion, or a U-shaped groove, and the brush head seat is provided with a corresponding passive protrusion, a receiving groove, or a passive cylinder.

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