High-frequency reciprocating rotation electric toothbrush rod

Abstract

A high-frequency reciprocating rotating electric toothbrush rod can work in a wide frequency range of 140-350 Hz and high swing frequency and comprises a brush rod shell, an inner support, a rotating brush head assembly and a rotating power transmission assembly, the brush rod shell is hollow, the rear end of the brush rod shell is detachably connected to a main machine of an electric toothbrush, the rear portion of the brush rod shell is in a trumpet shape, and the inner support is contained in the brush rod shell. The inner support is in a horn shape and matched with an inner cavity of the brush rod shell, the inner support is hollow so as to form an inner space with a built-in rotary power transmission assembly, and a round groove for containing the rotary brush head assembly is formed in the front end of the brush rod shell. Therefore, the utility model can effectively compensate the gap after abrasion, solves the problems of service life and noise at high rotating speed, not only meets the dynamic coupling requirement, but also solves the problems caused by the gap, and has the advantages of good absorption effect of noise caused by mutual collision in the movement process of components, and low operation noise.

Description

Technical Field

[0001] The utility model relates to the technical field of electric toothbrushes, in particular to a high-frequency reciprocating electric toothbrush rod which can work in a wide frequency range of 140 to 350 Hz and a high-swing frequency reciprocating rotation. Background Art

[0002] The working mode of the brush head of an electric toothbrush can be divided into two categories according to the action mode: the brush head rotates or the entire brush head vibrates. In the rotating brush head mode, the design difficulties are mainly the following:

[0003] The higher the speed, the greater the noise. The rotation frequency of a conventional brush head is less than 133Hz. Factors that affect the life of a brush head include: brush head structure, size, material, speed, output torque and toothpaste abrasives. The structure of the brush head directly affects the service life. The addition of toothpaste, tooth powder, and other cleaning abrasives during the brushing process will dramatically shorten the service life of the toothbrush head due to wear of the structural parts.

[0004] Moreover, the existing brush heads have a complex structure and the manufacturing cost is correspondingly higher, which brings a heavy burden to consumers.

[0005] Therefore, the designer of the utility model has designed a high-frequency reciprocating electric toothbrush rod in view of the above defects through intensive research and design, and combined with the experience and achievements of many years in related industries to overcome the above defects. Utility Model Content

[0006] The purpose of the utility model is to provide a high-frequency reciprocating electric toothbrush rod, which can overcome the defects of the prior art, can effectively work up to the high frequency band of 350Hz, can still maintain excellent cleaning ability with high swing amplitude, has the characteristics of low noise, long life, simple structure, good economy, etc.

[0007] To achieve the above-mentioned purpose, the utility model discloses a high-frequency reciprocating electric toothbrush rod, which is installed at the front end of an electric toothbrush and comprises a brush rod shell, an inner bracket, a rotating brush head assembly and a power transmission assembly. The rear portion of the brush rod shell is formed into a trumpet shape and accommodates the inner bracket. The inner bracket is a trumpet shape adapted to the inner cavity of the brush rod shell to form an inner space of the built-in power transmission assembly. The front end of the brush rod shell forms a circular groove for accommodating the rotating brush head assembly, and is characterized in that:

[0008] The rotating brush head assembly comprises a brush head seat and rotating bristles. The brush head seat is rotatably arranged in a circular groove at the front end of the brush rod housing, a plurality of rotating bristles for cleaning are planted on the upper end thereof, and a base is arranged at the lower end thereof;

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

[0010] Wherein: the electric toothbrush includes a main body shell, the main body shell is hollow to form a built-in space, a swing motor as a main unit is provided at the front end of the built-in space of the main body shell, the output shaft of the swing motor extends from the front end of the main body shell and is connected to an elastic coupling body to provide power output, and a battery is provided at the rear end of the built-in space.

[0011] Wherein: it also includes a rotating assembly, which includes a fixing frame, a rotating shaft and a safety nail. The base of the brush head seat is passed through by the fixing frame, and the side of the fixing frame is fixed to the brush rod shell by the safety nail. The middle part of the fixing frame is provided with a through hole for the rotating shaft to pass through. Both ends of the rotating shaft can be rotatably extended into the brush head seat so that the brush head seat can rotate in 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 shell and the hole on the side of the fixing frame to form a transverse latch to safely lock the rotating brush head assembly on the brush rod shell.

[0013] Wherein: a compensation spring washer is arranged between the base of the brush head seat and the brush rod shell to provide compensation in the rotational motion.

[0014] Wherein: the front end of the connecting sleeve is tightly matched with the rear end of the rocker rod, the rear end of the connecting sleeve accommodates an elastic coupling body, the middle part of the elastic coupling body is provided with an inwardly concave ring convex ring, the connecting sleeve is correspondingly provided with an inner convex protrusion extending into the inner concave space of the elastic coupling body, or the outer edge of the elastic coupling body corresponding to the inwardly concave ring convex ring is provided with an outer convex protrusion to extend into a hollow groove of the connecting sleeve.

[0015] Wherein: the middle part of the elastic fulcrum is provided with a concave ring, and the front end of the inner bracket is correspondingly provided with an inner convex part that extends into the concave space of the elastic fulcrum. The concave ring is tightly matched with the middle part of the swing rod and the outer edge of the elastic fulcrum also forms a contact fit with the inner bracket so that the swing rod swings with the elastic fulcrum as the fulcrum.

[0016] Wherein: the swing arm is provided with a compensation spring between the driving head and the elastic fulcrum, the free length of the compensation spring is greater than the distance between the elastic fulcrum and the driving head, so that when the compensation spring is compressed, a constant reaction force will be generated to push the driving head toward the brush head seat so that the two are in close contact at any time to coordinate the elimination of the gap between the two and effectively stabilize the output angle and torque.

[0017] Wherein: the driving head is a convex head, and the base of the brush head seat is provided with a groove meshing with the convex head. The convex head and the groove are involute tooth shapes to ensure that the meshing friction type of the whole process is rolling friction.

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

[0019] From the above content, it can be seen that the high-frequency reciprocating electric toothbrush rod of the utility model has the following effects:

[0020] 1. The structure of the utility model can effectively compensate for the gap after wear and tear, and solve the problems of life and noise at high speed.

[0021] 2. The utility model adopts a flexible structure in the shaft connection and the swing arm fulcrum, which not only solves the power coupling demand, but also solves the problem caused by the gap. It also has a good effect of absorbing the noise caused by the collision between the components during the movement, and maintains the advantage of low noise in operation.

[0022] 3. Simple structure, low manufacturing cost and good economy.

[0023] The details of the present invention can be obtained from the following description and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The overall structural diagram of the high-frequency reciprocating electric toothbrush rod of the utility model is shown.

[0025] Figure 2 The schematic diagram of the exploded structure of the high-frequency reciprocating electric toothbrush rod of the utility model is shown.

[0026] Figure 3 A cross-sectional view of a high-frequency reciprocating electric toothbrush rod of the present invention is shown.

[0027] Figure 4 The internal schematic diagram of the high-frequency reciprocating electric toothbrush rod of the utility model is shown.

[0028] Figure 5A , Figure 5B and Figure 5C Schematic diagrams showing three action states of the high-frequency reciprocating electric toothbrush rod of the utility model.

[0029] Figure 6 The schematic diagram of the structure of the brush head holder in the utility model is shown.

[0030] Figure 7A partial cutaway view of the elastic coupling body in the utility model is shown.

[0031] Figure 8 A partial cutaway view of the elastic fulcrum in the utility model is shown.

[0032] Fig. 9 A schematic diagram of the internal structure of another embodiment of the high-frequency reciprocating electric toothbrush rod of the utility model is shown.

[0033] Fig. 10A and Fig. 10B The schematic diagram shows the principle of the compensation spring of the rotating brush rod in the utility model.

[0034] Fig.11A and Fig. 11B A structural schematic diagram of another embodiment of the utility model is shown.

[0035] Fig. 12A and Fig. 12B A structural schematic diagram of another embodiment of the utility model is shown.

[0036] Fig.13A , Fig. 13B , Fig. 13C and Fig.13D A structural schematic diagram of another embodiment of the utility model is shown.

[0037] Fig.14A and Fig. 14B The schematic diagram shows that the motion trajectory of the output shaft in the utility model is an arc circle.

[0038] Fig.15A and Fig. 15B The schematic diagram shows that the motion trajectory of the output shaft in the utility model is a reciprocating parallel line.

[0039] Fig.16 The utility model is shown as a schematic structural diagram of an electric toothbrush.

[0040] Reference numerals:

[0041] 10. Main body shell; 11. Tail cover; 12. Function button; 13. Control circuit board; 20. Oscillating motor; 30. Battery; 41. Brush rod shell; 421. Brush head seat; 422. Rotating bristles; 423. Fixed frame; 424. Rotating shaft; 425. Safety nail; 426. Compensating spring pad; 43. Rocker arm; 44. Elastic fulcrum; 45. Elastic coupling body; 46. Drive head; 47. Inner bracket; 48. Compensating spring; 49. Connecting sleeve. DETAILED DESCRIPTION

[0042] See also Figure 1 , Figure 2 , Figure 3and Figure 4 , showing the high-frequency reciprocating electric toothbrush rod of the utility model, wherein Figure 1 The overall structure diagram of the high-frequency reciprocating electric toothbrush rod of the utility model is shown. Figure 2 The schematic diagram of the exploded structure of the high-frequency reciprocating electric toothbrush rod of the utility model is shown. Figure 3 A cross-sectional view showing a high-frequency reciprocating electric toothbrush rod of the utility model is shown. Figure 4 The internal structure diagram of the high-frequency reciprocating electric toothbrush rod of the utility model is shown.

[0043] Specific as Figure 1 , Figure 2 and Figure 3 As shown, the high-frequency reciprocating electric toothbrush rod includes a brush rod shell 41, an inner bracket 47, a rotating brush head assembly and a power transmission assembly. The brush rod shell 41 is hollow and the rear end is detachably connected to the main unit of the electric toothbrush. The rear portion of the brush rod shell 41 is formed in a trumpet shape and accommodates the inner bracket 47. The inner bracket 47 is trumpet-shaped and adapted to the inner cavity of the brush rod shell 41 and is hollow inside to form an inner space for a built-in power transmission assembly. The front end of the brush rod shell 41 forms a circular groove for accommodating the rotating brush head assembly.

[0044] See also Fig.16 The installation schematic diagram shows a specific embodiment of the high-frequency reciprocating rotating electric toothbrush rod of the utility model applied to a high-frequency power multi-mode electric toothbrush. In this embodiment, the electric toothbrush also includes a main body shell 10, a swing motor 20 and a battery 30. The main body shell 10 is hollow to form a built-in space, and its rear end is closed by a detachable tail cover 11. The main body shell 10 contains a control circuit board 13 and has a plurality of function buttons 12 connected to the control circuit board 13 on the side wall, so that the operator can provide a control signal to the control circuit board 13 through the function buttons 12 to achieve the purpose of controlling the electric toothbrush. The front end of the built-in space of the main body shell 10 is provided with a swing motor 20, and the output shaft 245 of the swing motor 20 extends from the front end of the main body shell 10 to provide power output. The rear end of the built-in space is provided with a battery 30, and the battery 30 is electrically connected to the control circuit board 13 and the swing motor 20 to provide stable and reliable power output for the two.

[0045] The rear end of the brush rod housing 41 is detachably connected to the front end of the main body shell 10, the rear end of the power transmission assembly is connected to the output shaft 245 of the oscillation motor 20, and the front end is connected to the rotating brush head assembly, thereby transmitting the output power of the oscillation motor 20 to the rotating brush head assembly.

[0046] Specifically, the rotating brush head assembly includes a brush head seat 421 and rotating bristles 422, the brush head seat 421 is rotatably arranged in a circular groove at the front end of the brush rod housing 41, and a plurality of rotating bristles 422 for cleaning are planted on the upper end thereof, and a base is provided at the lower end thereof, wherein, in the illustrated embodiment, the brush head seat 421 is connected to the brush rod housing 41 via a rotating assembly, and the rotating assembly includes a fixing frame 423, a rotating shaft 424 and a safety pin 425, and the base of the brush head seat 421 is provided for the fixing frame 4 23 is movable through, the side of the fixing frame 423 is fixed to the brush rod housing 41 by a safety nail 425, and the middle of the fixing frame 423 is provided with a through hole for the rotation shaft 424 to pass through, and the two ends of the rotation shaft 424 extend into the brush head seat 421, so that the fixing frame 423 is relatively fixed to the brush rod housing 41 through the safety nail 425, and the brush head seat 421 rotates relative to the fixing frame 423, so that the brush head seat 421 can rotate in the circular groove through the power transmission of the rotating power component.

[0047] Optionally, a compensation spring washer 426 is provided between the base of the brush head holder 421 and the brush rod housing 41 to provide compensation during rotational motion.

[0048] The power transmission assembly includes a swing rod 43, an elastic fulcrum 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 a driving head 46 for driving the brush head seat 421. Figures 2 to 4 In the embodiment of the present invention, the drive head 46 is a convex head in this embodiment, and see Figure 6 The base of the brush head seat 421 is provided with a groove 4211 which meshes with the convex head, so that the convex head serving as the driving head 46 can extend into and engage with the tooth groove 4211 to realize power transmission between the two, wherein the middle part of the rocker arm 43 is elastically supported on the front end inner wall of the inner bracket 47 through an elastic fulcrum 44, and the rocker arm 43 is provided with a compensation spring 48 between the driving head 46 and the elastic fulcrum 44, and the connecting sleeve 49 is embedded in the rear end of the inner bracket 47, and the rear end of the rocker arm 43 extends into the front end of the connecting sleeve 49, and the rear end of the connecting sleeve 49 is connected to the output shaft 245 of the oscillating motor through an elastic coupling body 45 to transmit power.

[0049] Therefore, the brush head seat of the rotating brush rod is circular or elliptical, and the movement of the brush head seat is a rotary pair. The center of rotation is the center of the circle of the brush head seat around the rotating axis 424. The movement of the circular brush head seat is back and forth rotation in opposite directions. The rotation angle range is usually 10-120 degrees, and the conventional reciprocating rotation frequency is 80-130Hz.

[0050] exist Figures 2 to 4In a specific embodiment, the rotating brush rod can reliably operate in the range of 80-350 Hz and maintain an effective load swing angle of more than 20 degrees.

[0051] Among them, the free length of the compensation spring 48 is greater than the distance between the drive head 46 and the elastic fulcrum 44. After the compensation spring 48 is compressed, a reaction force is generated to push the drive member toward the brush head seat. The connecting sleeve 49 is a trumpet-shaped sleeve, and 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.

[0052] Therefore, if Figure 5A , Figure 5B and Figure 5C As shown, when the output shaft swings, the power is coupled through the connecting sleeve 49 and the elastic coupling body 45, and the swing arm swings with the elastic fulcrum 44 as the fulcrum. The swing of the swing arm drives the driving member 46 to follow, and the driving member 46 further drives the bristle holder to swing at high speed. When the swing arm swings in the opposite direction, the movement direction of the brush head holder also changes in the opposite direction. The swing of the swing arm in two directions constitutes a complete motion cycle. The mechanics of the action of the swing arm on the brush head holder is essentially a simple lever principle. The position of the elastic fulcrum at the top of the inner bracket determines the size of the output swing angle and output torque of the brush head. The closer the elastic fulcrum moves to the brush head, the smaller the swing angle of the brush head holder and the greater the torque of the brush head holder. Conversely, the swing angle of the brush head holder becomes larger and the torque of the brush piece decreases.

[0053] Among them, Figure 7 As shown, in a preferred embodiment of the utility model, the front end of the connecting sleeve 49 is tightly matched with the rear end of the rocker arm 43, and the rear end accommodates an elastic coupling body 45. The middle part of the elastic coupling body 45 is provided with a concave ring convex ring 451, and the connecting sleeve 49 is correspondingly provided with an inner protrusion that extends into the concave space of the elastic coupling body 45. The cooperation between the concave ring convex ring 451 and the inner protrusion can better cooperate with the output shaft of the rocker motor for power transmission.

[0054] Figure 8 As shown, in a preferred embodiment of the utility model, a concave ring 441 is provided in the middle of the elastic fulcrum 44, and a corresponding convex portion is provided at the front end of the inner bracket 47 which is concave and extends into the concave space of the elastic fulcrum 44, so that the concave ring 441 of the elastic fulcrum 44 is tightly matched with the middle of the rocker arm 43 and the outer edge of the elastic fulcrum 44 is also in contact with the inner bracket 47, so that the rocker arm 43 can swing stably with the elastic fulcrum 44 as the fulcrum.

[0055] Among them, Fig. 9 In another embodiment shown in the figure, another form of the power transmission assembly of the high-frequency reciprocating electric toothbrush rod of the utility model is shown. In this embodiment, the structure of the connecting sleeve 49' and the elastic coupling body 45' is similar to that of the electric toothbrush rod of the utility model. Figures 1 to 4 There is a difference in Fig. 9 In the embodiment, the outer edge of the elastic coupling body 45' corresponding to the inner concave ring convex ring 451 is provided with an outer protrusion to extend into a hollow groove of the connecting sleeve 49' to achieve stable coupling between the connecting sleeve 49' and the elastic coupling body 45'. This structure can better achieve dynamic coupling between the connecting sleeve 49' and the elastic coupling body 45'.

[0056] like Fig. 10A and Fig. 10B As shown, by arranging a compensation spring 48 between the elastic fulcrum and the driving head, the free length L2 of the compensation spring 48 is greater than the distance L1 between the elastic fulcrum and the driving head. Therefore, when the compensation spring 48 is compressed, a constant reaction force will be generated to push the driving head toward the brush head seat, so that the two are in close contact at any time, so that the gap between the two can be eliminated at any time. Therefore, the compensation spring 48 can be referred to as an elastic compensation gap elimination mechanism. The elastic compensation gap elimination mechanism will produce the following improvement effect on the performance under the following working conditions:

[0057] 1. During the brushing process, the brush head seat will lose engagement with the surface of the drive head due to load changes, resulting in a matching gap. At this time, the elastic compensation and clearance-eliminating mechanism will take effect, and the toothed surface will be tightened under the reaction force of the compensation spring.

[0058] 2. During use, under the action of toothpaste abrasive, the rolling friction between the drive head and the brush head seat causes wear on the mating surface and also leads to the generation of mating clearance. At this time, the elastic compensation and clearance elimination mechanism will come into play.

[0059] 3. The brush head seat spindle and the spindle fixing frame will also produce a matching gap due to wear under the action of toothpaste abrasive during user use. Due to the existence of the reaction force of the compensation spring, the worn components will be tightened, thus solving the noise caused by the impact of the gap between high-speed moving components.

[0060] 4. The components composed of the rocker arm and the drive head are separated, and there will be tolerances in the actual manufacturing and assembly process, which will cause a fit clearance. At this time, the elastic compensation and anti-backlash mechanism will come into play.

[0061] 5. There will be errors between the theoretical design and the actual manufacturing of the shape. The error will also cause a gap between the convex head and the groove of the brush head seat. At this time, the elastic compensation and clearance elimination mechanism will come into play.

[0062] In summary, the elastic compensation and clearance-eliminating mechanism formed by the compensation spring 48 can effectively stabilize the output angle and torque during the brushing process, reduce noise, and effectively increase the service life.

[0063] It is more preferred that the brush rod moving structure works in the working condition of toothpaste abrasive and grinding liquid for a long time. In addition to the reasonable selection of high wear-resistant materials to make components, the gearing profile of the drive head and the brush head seat should be reasonably designed. In theory, the gearing area should be maximized during the entire motion cycle, which is conducive to reducing the gearing pressure and improving the wear resistance. And the friction between the gearing surfaces should be guaranteed to be rolling friction as much as possible, and the occurrence of sliding friction should be reduced as much as possible, which can better resist the wear resistance.

[0064] In a further preferred embodiment, a conventional involute profile curve is preferred to solve the above problem, and the convex head and the groove 4211 are involute tooth shapes, thereby ensuring that the toothing friction type of the entire process is rolling friction. In order to maximize the toothing area, the maximum modulus and the maximum tooth thickness are selected as much as possible.

[0065] In the embodiment, in addition to using the involute tooth profile to solve the meshing problem between the protrusion and the groove of the toothed brush rod, it can also be expanded to other contour graphics, such as the protrusion is a cylindrical surface and the groove is a trapezoidal surface. Because the utility model is provided with a compensation spring, a constant force can be exerted to push the boss toward the brush head seat. In theory, there is no gap in the meshing of the entire protrusion movement and the groove. However, compared with the involute tooth profile solution, there will be sliding friction in the friction during the movement process, so the theoretical life is weaker than the involute tooth profile solution.

[0066] The implementation method of the drive head and the passive parts discussed in the present invention can be based on actual design requirements, such as Fig.11A and Fig. 11B In the embodiment shown, the front end of the driving head 46 can be formed into 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 shape or a multi-tooth shape. Such changes in form belong to the scope of the extension of the utility model.

[0067] exist Fig. 12A , Fig. 12B In another embodiment, the head of the driving head 46 is formed with a cylindrical protrusion 46", and the brush head seat 42 is provided with a corresponding accommodating groove 4213, and the front end of the cylindrical protrusion 46" is formed in a cylindrical shape.

[0068] exist Fig.13A , Fig. 13B , Fig. 13C and Fig.13D In another embodiment, a U-shaped groove 46 ″′ is formed on the head of the driving head 46 , and a corresponding passive cylinder 4214 is disposed on the brush head seat 42 .

[0069] Among them, the base of the brush head seat 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 and the fixing frame are interference fit without relative movement. The two ends of the rotating shaft 424 are extended and matched with the base gap to form two independent coaxial rotating motion pairs.

[0070] Among them, the safety pin 425 is perpendicular to the axis of the rotating shaft 424, and the rotating brush head assembly is safely locked on the brush rod housing through the horizontal hole on the brush rod housing 41 and the hole on the side of the fixing frame 423. Therefore, the reason for the horizontal device of this safety pin is to prevent the main body from falling vertically, causing the safety pin to be impacted, causing the safety pin hole to be broken, loose, dented... and other unsafe damages, causing the risk of the brush head assembly falling off.

[0071] like Fig.14A and Fig. 14B As shown, Fig.14A This is a schematic diagram of the output shaft of the oscillating motor in the present invention being in a stationary state. Fig. 14B The schematic diagram shows the output shaft swinging left and right, and the output shaft swings around the origin O, P1 and P2 are the extreme swingable positions at both ends, A is the maximum swingable angle, and B represents the arc-shaped motion trajectory formed by the coupling point under the swing. Therefore, 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 center of rotation.

[0072] Among them, Fig.15A and Fig. 15B As shown, Fig.15A This is a schematic diagram of the output shaft being stationary. Fig. 15B The schematic diagram shows the output shaft swinging left and right. The output shaft in the figure moves in parallel, not in arc swing, which is another example of the oscillating motor mentioned in the utility model. Whether the motor shaft swings or swings in parallel, it can meet the requirements of the toothbrush head driving power source mentioned in the utility model. P1 and P2 are the extreme positions of parallel swinging, and D is the swinging stroke.

[0073] It can be seen that the main working mechanism of the utility model is:

[0074] 1. The main unit of the electric toothbrush provides a reciprocating swing torque through the output shaft. The trumpet-shaped sleeve at the end of the swing rod and the embedded connecting sleeve 49 and the elastic coupling body 45 form a coupling. The output shaft of the main unit and the inner hole of the connecting sleeve 49 and the elastic coupling body 45 made of elastic material realize dynamic coupling, driving the swing rod to swing back and forth.

[0075] 1.1 The middle part of the elastic coupling body 45 is designed as an inner concave ring convex ring 451, and the entire main shaft extends into the inner concave ring convex ring 451 to make linear contact with it, so as to achieve interference-free swinging process and ensure effective power coupling.

[0076] 1.2 The connecting sleeve 49 and the elastic coupling body 45 can also be made of rigid plastic or other materials. The embodiment of the utility model uses elastic materials to effectively absorb the noise generated by the impact force of the swing arm when the output shaft of the host swings and changes direction.

[0077] 1.3 The hardness of the connecting sleeve 49 and the elastic coupling body 45 should be moderate. If the hardness is too low, it will affect the swing arm dynamic coupling effect and sacrifice the final output torque performance of the brush head holder.

[0078] 2. The elastic fulcrum in the middle of the swing rod and the top of the inner bracket constitutes a lever fulcrum. When the coupling swings, the driving head at the other end of the swing rod swings in the opposite direction, and the driving head and the brush head seat cooperate with each other, and finally drive the moving brush head to swing around the central rotating axis.

[0079] 2.1 The elastic fulcrum constituting the fulcrum is provided with a concave ring 441 with an annular convex surface. The minimum diameter of the convex surface of the concave ring 441 is slightly larger than or equal to the outer diameter of the swing rod, so that the swing rod can achieve axial sliding in the hole. The concave ring 441 can effectively prevent the interference of the shaft sleeve and the loss of power when the swing rod swings.

[0080] 2.2 The material of the elastic fulcrum can also be made of rigid plastic. The embodiment of the utility model is specially made of elastic rubber body, the purpose is to use the elastic body to effectively buffer and absorb the noise and abnormal sound caused by the collision of components due to the gap during swinging. The hardness of the elastic fulcrum should be moderate and not too low, otherwise the elastic body will be excessively deformed under heavy load, causing a significant change in the fulcrum position or displacement loss of the swing arm swing stroke, and insufficient power at the end of the swing arm. The embodiment of the utility model preferably uses 80-90 degree nitrile rubber to make the elastic fulcrum.

[0081] 3. In one of the embodiments, the convex head is wrapped by the groove of the brush head seat. When the convex platform swings, the groove is pushed and displaced. Since the brush head seat has a rotating shaft 424 to form a rotating pair, the displacement of the groove is ultimately manifested as the repeated rotation of the brush head driving the bristles on the brush head to rotate and swing.

[0082] 3.1 Theoretically, the ideal state of the boss and the groove should be a gapless fit during the entire reciprocating swing process, and the friction between the surface of the boss and the groove of the brush head seat is rolling friction rather than sliding friction. At this time, the material wear caused by the dynamic coupling is minimal, and the coupling power loss is minimal. The embodiment of the utility model preferably uses the traditional involute tooth shape to achieve the shape envelope of the boss and the groove. Among them, the center of the pitch circle of the boss is the fulcrum of the swing rod, that is, the annular boss of the elastic body at the top of the inner bracket of the brush rod. The central axis of the brush head seat is the center of the pitch circle of the groove of the brush head seat. The ratio of the convex head pitch circle to the brush head seat pitch circle determines the torque conversion ratio of the dynamic coupling, which ultimately affects the swing angle and output torque of the brush head seat. In theory, the distance from the swing rod fulcrum to the boss matching point is proportional to the swing angle of the brush head seat, and inversely proportional to the output torque of the brush head seat.

[0083] 3.2 The boss and the brush head seat groove are involute enveloped, and the entire reciprocating motion matching process is a gap-free match under ideal conditions. Therefore, in theory, the running noise caused by the gap between the boss and the brush head groove can be completely eliminated.

[0084] 3.3 The boss and groove of the utility model can be matched with single teeth or multiple teeth. In the embodiment of the utility model, based on the wear resistance and the applicable swing angle range of the brush head seat, a single boss and a single groove structure of the brush head seat are preferred. The tooth modulus can be maximized to improve the actual strength and wear resistance of the boss.

[0085] 3.4 In the embodiment of the utility model, in order to improve the wear resistance of 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. The working space of the thick teeth is reserved in the design.

[0086] 4. The rocker arm mentioned in the present invention is preferably made of a stainless steel bar with good rigidity in the embodiments. During the implementation and verification process, it was found that if the rocker arm is not rigid enough, under the action of high-frequency swinging force, the swing angle will be partially offset due to the flexible resonant deformation of the rocker arm, which will eventually result in a smaller swing angle and output torque of the brush head, thereby losing the expected performance.

[0087] 5. The safety pin of the embodiment of the utility model is perpendicular to the axis of the brush rod, not the traditional coaxial direction, which can effectively prevent the safety pin from being directly impacted by the impact force when the head falls to the ground, causing the safety pin position to collapse toward the main axis of the brush head seat, causing the brush head seat to crack or the safety pin hole to crack, causing the brush head seat to fall off during use. After the safety pin is installed perpendicular to the brush shaft, the above problems can be effectively avoided, and the safety factor of the brush head seat in various working conditions can be improved.

[0088] It is obvious that the above description and record are only examples and are not intended to limit the disclosure, application or use of the utility model. Although the embodiments have been described in the embodiments and described in the drawings, the utility model is not limited to the specific examples of the teachings of the utility model as the best mode currently considered to implement the utility model by the drawings and described in the embodiments, and the scope of the utility model will include any embodiment falling within the previous description and the attached claims.

Claims

1. A high-frequency reciprocating electric toothbrush rod, which is installed at the front end of an electric toothbrush and comprises a rod housing, an inner bracket, a rotating brush head assembly and a power transmission assembly, wherein the rear portion of the rod housing is formed into a trumpet shape and accommodates the inner bracket, the inner bracket is trumpet-shaped and adapted to the inner cavity of the rod housing to form an inner space for the built-in power transmission assembly, and the front end of the rod housing is formed with a circular groove for accommodating the rotating brush head assembly, characterized in that: The rotating brush head assembly comprises a brush head seat and rotating bristles. The brush head seat is rotatably arranged in a circular groove at the front end of the brush rod housing, a plurality of rotating bristles for cleaning are planted on the upper end thereof, and a base is arranged at the lower end thereof; The power transmission component includes a rocker arm, an elastic fulcrum, an elastic coupling body and a connecting sleeve. The front end of the rocker arm is provided with a driving head for driving the brush head seat. The middle part of the rocker arm is elastically supported on the inner bracket through the elastic fulcrum. The rear end of the rocker arm extends into the front end of the connecting sleeve. The rear end of the connecting sleeve is connected to the elastic coupling body to transmit power.

2. The high-frequency reciprocating electric toothbrush rod according to claim 1, characterized in that: The electric toothbrush includes a main body shell, which is hollow to form a built-in space. A swing motor serving as a main unit is provided at the front end of the built-in space of the main body shell. The output shaft of the swing motor extends from the front end of the main body shell and is connected to an elastic coupling body to provide power output. A battery is provided at the rear end of the built-in space.

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

4. The high-frequency reciprocating electric toothbrush rod according to claim 3, characterized in that: 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 shell and the hole on the side of the fixing frame to form a transverse latch to safely lock the rotating brush head assembly on the brush rod shell.

5. The high-frequency reciprocating electric toothbrush rod according to claim 1, characterized in that: A compensation spring washer is arranged between the base of the brush head seat and the brush rod shell to provide compensation in the rotational motion.

6. The high-frequency reciprocating electric toothbrush rod according to claim 1, characterized in that: The front end of the connecting sleeve is tightly matched with the rear end of the rocker arm, and the rear end of the connecting sleeve accommodates an elastic coupling body. The middle part of the elastic coupling body is provided with an inwardly concave ring convex ring, and the connecting sleeve is correspondingly provided with an inner convex protrusion extending into the concave space of the elastic coupling body, or the outer edge of the elastic coupling body corresponding to the inwardly concave ring convex ring is provided with an outer convex protrusion to extend into a hollow groove of the connecting sleeve.

7. The high-frequency reciprocating electric toothbrush rod according to claim 1, characterized in that: A concave ring is provided in the middle of the elastic fulcrum, and a convex portion is correspondingly provided at the front end of the inner bracket, which is concave and extends into the concave space of the elastic fulcrum. The concave ring is tightly matched with the middle of the rocker arm, and the outer edge of the elastic fulcrum also forms a contact fit with the inner bracket, so that the rocker arm swings with the elastic fulcrum as the fulcrum.

8. The high-frequency reciprocating electric toothbrush holder according to any one of claims 1 to 7, characterized in that: The rocker arm is provided with a compensation spring between the driving head and the elastic fulcrum, and the free length of the compensation spring is greater than the distance between the elastic fulcrum and the driving head, so that when the compensation spring is compressed, a constant reaction force is generated to push the driving head toward the brush head seat so that the two are in close contact at any time to eliminate the gap between the two and effectively stabilize the output angle and torque.

9. The high-frequency reciprocating electric toothbrush rod according to claim 1, characterized in that: The driving head is a convex head, and a groove meshing with the convex head is provided on the base of the brush head seat. The convex head and the groove are involute tooth shapes to ensure that the meshing friction type of the whole process is rolling friction.

10. The high-frequency reciprocating electric toothbrush rod according to claim 1, characterized in that: The front end of the driving head is formed into an active groove, a cylindrical convex head or a U-shaped groove, and the brush head seat is provided with a corresponding passive boss, a receiving groove or a passive cylinder.

Images