Engine device and electric toothbrush

Abstract

The invention discloses an engine device and an electric toothbrush, and belongs to the technical field of cleaning supplies. The engine device comprises a driving mechanism, a transmission mechanism, an output mechanism and a supporting shell. The driving mechanism is connected with the transmission mechanism, and the transmission mechanism is provided with two eccentric output parts; the output mechanism is connected with the two eccentric output parts, and the output mechanism is movably mounted on the supporting shell; when the engine device runs, the driving mechanism drives the output mechanism to do reciprocating translation and reciprocating rotation simultaneously relative to the supporting shell through the two eccentric output parts. Thus, through cooperation of the single driving mechanism and the two eccentric output parts integrated on one transmission mechanism, bidirectional composite motion of the output end is achieved, the structure is compact, the number of parts is reduced, the assembling difficulty is lowered, and meanwhile the operation reliability of the whole machine can be improved.

Description

Technical Field

[0001] This application relates to the field of cleaning products, and more particularly to an engine device and an electric toothbrush. Background Technology

[0002] An electric toothbrush is an oral cleaning device that uses an electric motor to drive the brush head to vibrate at high frequency. As a personal care product, its core functions include breaking down toothpaste, removing plaque, and massaging gums through mechanical action. To further improve cleaning efficiency and user experience, some electric toothbrushes are equipped with an engine structure that enables the brush head to perform compound movements, allowing the brush head to simultaneously oscillate left and right and reciprocate up and down, aiming to more thoroughly clean the tooth surface and interdental areas.

[0003] Currently, there are two main technical approaches to achieve compound brush head motion in electric toothbrushes: one is to use two independent electromagnetic drive units to control the left-right vibration and up-down sliding of the brush head respectively. This structure requires two complete electromagnetic components and drive circuits; the other is to use a mechanical structure with multiple gear transmissions to convert the single rotational motion of the motor into two different directional motion outputs.

[0004] However, the engine structure described above requires two sets of independent drive units due to the use of two sets of electromagnetic structures. The gear transmission structure has a large number of parts and a complex structure, which not only makes assembly more difficult but also results in lower product reliability. Summary of the Invention

[0005] This application provides an engine device and an electric toothbrush, the technical solutions of which are as follows: According to one aspect of this application, an engine device is provided, the engine device comprising: a drive mechanism, a transmission mechanism, an output mechanism, and a support housing; The drive mechanism is connected to the transmission mechanism and is used to drive the transmission mechanism to rotate. The transmission mechanism has two eccentric output sections. The output mechanism is connected to the two eccentric output sections respectively, and the output mechanism is movably mounted on the support housing; The drive mechanism is used to drive the output mechanism to reciprocate translation and rotation relative to the support housing through the two eccentric output parts.

[0006] Optionally, the transmission mechanism has an eccentric shaft, and the two eccentric output sections are a first eccentric section and a second eccentric section arranged along the axial direction of the eccentric shaft.

[0007] Optionally, the output mechanism includes a first conversion element, a second conversion element, and an output element; One end of the first conversion component is connected to the first eccentric section, and the other end is movably connected to the second conversion component; One end of the second conversion component is movably connected to the second eccentric section, and the other end is fixedly connected to the output component; The output component is movably mounted on the support housing, with one end fixedly connected to the second conversion component and the other end extending to the outside of the support housing.

[0008] Optionally, the drive mechanism drives the transmission mechanism to rotate about the first axis; The first end of the first conversion component is provided with a sleeve portion, which is sleeved on the first eccentric section to drive the second conversion component and the output component to reciprocate and translate along a first direction, which is perpendicular to the extension direction of the first axis. The first end of the second conversion component is provided with a deflection part, which is movably sleeved on the second eccentric section to drive the output component to reciprocate around the second axis, the second axis being parallel to the first direction.

[0009] Optionally, the sleeve portion has a first through hole, the shape of which is adapted to the outer peripheral shape of the first eccentric segment; The deflection portion has a second through hole, in which the second eccentric segment is accommodated. The second through hole limits the second eccentric segment in a direction perpendicular to the first direction and allows the second eccentric segment to slide relative to the first direction.

[0010] Optionally, the second end of the first conversion member is provided with a first mating part; The first end of the second conversion component is also provided with a second mating part; The first mating part and the second mating part are movably connected and can rotate relative to each other in multiple directions.

[0011] Optionally, the support housing is provided with a guide structure, and the output member is slidably engaged with the guide structure to constrain the output member to reciprocate along the first direction; the output member is also rotatably engaged with the support housing to constrain the output member to swing around the second axis.

[0012] Optionally, the eccentricity of the first eccentric segment is greater than, equal to, or less than the eccentricity of the second eccentric segment.

[0013] Optionally, the drive mechanism includes a drive motor and a first gear, and the transmission mechanism further includes a second gear and a rotating shaft; The first gear is connected to the output end of the drive motor and meshes with the second gear for transmission; The second gear is rotatably connected to the support housing via the rotating shaft, the axis of the first gear is perpendicular to the axis of the second gear, and the eccentric shaft is disposed on the second gear; The drive motor, the first gear, the transmission mechanism, the first conversion component, the second conversion component, and the output component are sequentially connected and coaxially arranged along the first direction.

[0014] According to another aspect of this application, an electric toothbrush is provided, comprising: a handle housing, the aforementioned motor assembly, a power supply unit, a control board, and a brush head; The engine unit, the power supply unit, and the control board are all installed inside the handle housing, and the brush head is detachably connected to the engine unit.

[0015] The beneficial effects of the technical solutions provided in this application include at least the following: An engine device is provided, comprising: a drive mechanism, a transmission mechanism, an output mechanism, and a support housing. The drive mechanism is connected to the transmission mechanism and drives the transmission mechanism to rotate. The transmission mechanism has two eccentric output parts. The output mechanism is connected to each of the two eccentric output parts and is movably mounted on the support housing. When the engine device is running, the drive mechanism drives the output mechanism to simultaneously perform reciprocating translation and reciprocating rotation relative to the support housing through the two eccentric output parts. Specifically, the rotation of the drive motor drives the two eccentric output parts on the transmission mechanism to rotate. Because the motion trajectories of the two eccentric output parts are different, they together form a compound drive on the output mechanism. Under the motion constraint of the support housing, the output mechanism is forced to synthesize a specific compound motion: on the one hand, it reciprocates along the axial direction; on the other hand, it reciprocates around its own axis while translating.

[0016] Thus, through the cooperation of a single drive mechanism and two eccentric output parts integrated into a transmission mechanism, bidirectional compound motion at the output end is achieved. This results in a compact structure, reduced number of parts, lower production costs and assembly difficulty, while also improving the overall reliability of the machine. When the engine device in this embodiment is applied to an electric toothbrush, it can drive the brush head to achieve a synchronous two-dimensional compound motion of up-and-down reciprocating cleaning and left-and-right oscillating cleaning. This more effectively pushes the bristles into the gaps between teeth and the gingival sulcus, improving cleaning effect and user experience. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic cross-sectional view of an electric toothbrush provided in an embodiment of this application; Figure 2This is a schematic diagram of the structure of an engine device provided in an embodiment of this application; Figure 3 yes Figure 2 The diagram shows the internal structure of the engine unit. Figure 4 This is an exploded structural diagram of an engine device provided in an embodiment of this application; Figure 5 yes Figure 2 The diagram shows a cross-sectional view of the engine assembly. Figure 6 This is a schematic diagram of the structure of a transmission mechanism provided in an embodiment of this application; Figure 7 This is a schematic diagram of the structure of a first conversion component provided in an embodiment of this application; Figure 8 This is a schematic diagram of the structure of a second conversion component provided in an embodiment of this application; Figure 9 This is a schematic diagram of a rotational state of the second conversion component provided in an embodiment of this application; Figure 10 This is a schematic diagram of another rotational state of the second conversion member provided in the embodiments of this application.

[0019] Explanation of reference numerals in the attached figures: Engine assembly 100, drive mechanism 110, drive motor 111, first gear 112, transmission mechanism 120, eccentric output part 121, first eccentric section 122, second eccentric section 123, second gear 124, mounting cylinder 1241, rotating shaft 125, first axis z1, first direction d1, output mechanism 130, first conversion component 131, sleeve part 1311, first mating part 1312, second conversion component 132, deflection part 1321, second mating part 1322, output component 133, second axis z2, support housing 140, guide structure 141; handle housing 200, power supply component 300, control board 400, brush head 500, function button 600, waterproof ring 700. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0021] Although this application can readily be embodied in various forms, only some specific embodiments are shown in the accompanying drawings and will be described in detail in this specification. It is understood that this specification should be regarded as an exemplary illustration of the principles of this application and is not intended to limit the application to what is described herein.

[0022] Therefore, a feature pointed out in this specification is used to describe one feature of one embodiment of this application, and does not imply that every embodiment of this application must have the described feature. Furthermore, it should be noted that this specification describes many features. While certain features may be combined to illustrate possible system designs, these features may also be used in other combinations not explicitly stated. Therefore, unless otherwise stated, the described combinations are not intended to be limiting.

[0023] In the embodiments shown in the accompanying drawings, the directional indications (such as up, down, left, right, front, and back) used to explain the structure and movement of the various elements of this application are relative rather than absolute. These descriptions are appropriate when these elements are in the positions shown in the drawings. If the descriptions of the positions of these elements change, these directional indications also change accordingly.

[0024] Please refer to Figure 1 , Figure 2 , Figure 1 This is a schematic cross-sectional view of an electric toothbrush provided in an embodiment of this application. Figure 2 This is a schematic diagram of the structure of an engine device 100 provided in an embodiment of this application. Figure 3 yes Figure 2 The diagram shows the internal structure of the engine unit 100. Figure 4 This is an exploded structural diagram of an engine device 100 provided in an embodiment of this application. The black arrows in the diagram indicate the direction of movement of the structure. The engine device 100 in this embodiment can be applied in an electric toothbrush to provide a basis for compound motion of the brush head 500 of the electric toothbrush. The engine device 100 may include: a drive mechanism 110, a transmission mechanism 120, an output mechanism 130, and a support housing 140.

[0025] The drive mechanism 110 is connected to the transmission mechanism 120 and is used to drive the transmission mechanism 120 to rotate. The transmission mechanism 120 has two eccentric output parts 121. The power mechanism may include a drive motor 111. The two eccentric output parts 121 can be fixedly mounted on the same transmission mechanism 120. When the output end of the drive motor 111 rotates, it can drive the transmission mechanism 120 to rotate, thereby driving the two eccentric output parts 121 to rotate.

[0026] The output mechanism 130 is connected to two eccentric output sections 121, and is movably mounted on the support housing 140. The support housing 140 can serve as the outer shell of the engine unit 100, and the engine mechanism can be installed inside the support housing 140. One end of the output mechanism 130 is located inside the support housing 140 and connected to the two eccentric output sections 121 of the power mechanism, while the other end extends out of the support housing 140. The support housing 140 is provided with mounting through holes for the output mechanism 130 to extend out and to constrain the direction of movement of the output mechanism 130. The drive mechanism 110 is used to drive the output mechanism 130 to reciprocate in translation and rotation relative to the support housing 140 via the two eccentric output sections 121.

[0027] When the engine unit 100 is running, the drive mechanism 110 drives the output mechanism 130 to simultaneously reciprocate translation and rotation relative to the support housing 140 via two eccentric output sections 121. Specifically, the rotation of the drive motor 111 drives the two eccentric output sections 121 on the transmission mechanism 120 to rotate. Since the motion trajectories of the two eccentric output sections 121 are different, they together form a compound drive on the output mechanism 130. Under the motion constraint of the support housing 140, the output mechanism 130 cannot simply rotate or simply vibrate, but is forced to synthesize a specific compound motion: the output mechanism 130 reciprocates translation along the axial direction on the one hand, and reciprocates rotation around its own axis on the other hand while translating.

[0028] When the engine device 100 in this embodiment is applied to an electric toothbrush, the operation process is as follows: after the drive motor 111 is started, the two eccentric output parts 121 on the transmission mechanism 120 rotate, and the drive output mechanism 130 drives the brush head 500 to perform a small-amplitude reciprocating thrusting motion along the length of the toothbrush, and at the same time, to perform a small-angle reciprocating torsional oscillation around its own axis. This allows the brush head 500 to achieve synchronous two-dimensional motion of up-and-down reciprocating cleaning and left-and-right oscillating cleaning.

[0029] Compared to existing technologies that employ two sets of electromagnets or multiple sets of gear transmissions, this application achieves bidirectional compound motion at the output end through the cooperation of a single drive mechanism 110 and two eccentric output sections 121 integrated into a transmission mechanism 120. This results in a compact structure, reducing the number of parts, production costs, and assembly difficulty. Furthermore, compared to the single high-frequency vibration of traditional sonic toothbrushes, the engine device 100 in this embodiment can also achieve synchronous two-dimensional compound motion of up-and-down reciprocating motion and left-and-right reciprocating oscillation (i.e., reciprocating rotation around its own axis). This compound motion more effectively pushes the bristles of the electric toothbrush into the gaps between teeth and the gingival sulcus, thereby improving cleaning effectiveness and user experience.

[0030] In summary, this application provides an engine device 100, including a drive mechanism 110, a transmission mechanism 120, an output mechanism 130, and a support housing 140. The drive mechanism 110 is connected to the transmission mechanism 120 and is used to drive the transmission mechanism 120 to rotate. The transmission mechanism 120 has two eccentric output portions 121. The output mechanism 130 is connected to the two eccentric output portions 121 respectively, and the output mechanism 130 is movably mounted on the support housing 140. When the engine device 100 is running, the drive mechanism 110 drives the output mechanism 130 to simultaneously reciprocate translation and reciprocate rotation relative to the support housing 140 through the two eccentric output portions 121. Specifically, the rotation of the drive motor 111 drives the two eccentric output parts 121 on the transmission mechanism 120 to rotate. Since the motion trajectories of the two eccentric output parts 121 are different, they together form a compound drive for the output mechanism 130. Under the motion constraint of the support housing 140, the output mechanism 130 is forced to synthesize a specific compound motion: on the one hand, it reciprocates along the axial direction, and on the other hand, it reciprocates around its own axis while translating.

[0031] Thus, through the cooperation of a single drive mechanism 110 and two eccentric output sections 121 integrated on a transmission mechanism 120, bidirectional compound motion at the output end is achieved. This results in a compact structure, reduced number of parts, lower production costs and assembly difficulty, and improved overall machine reliability. When the engine device 100 in this embodiment is applied to an electric toothbrush, it drives the brush head 500 to achieve synchronous two-dimensional compound motion of up-and-down reciprocating cleaning and left-and-right oscillating cleaning. This more effectively pushes the bristles into the gaps between teeth and the gingival sulcus, improving cleaning effect and user experience.

[0032] Please continue to refer to this. Figure 5 and Figure 6 , Figure 5 yes Figure 2 The diagram shows a cross-sectional view of the engine unit 100. Figure 6 This is a schematic diagram of a transmission mechanism 120 provided in an embodiment of this application. In an optional embodiment, the transmission mechanism 120 has an eccentric shaft, and two eccentric output parts 121 are a first eccentric section 122 and a second eccentric section 123 arranged axially along the eccentric shaft. The transmission mechanism 120 can be a gear, and the drive mechanism 110 can drive the gear to rotate around the first axis z1. At the non-center position of the gear, the eccentric shaft extends perpendicularly to the gear tooth surface (or side surface). The eccentric shaft is divided axially into a first eccentric section 122 close to the gear tooth surface and a second eccentric section 123 away from the gear tooth surface. That is, the first eccentric section 122 and the second eccentric section 123 can be arranged in a direction away from the gear tooth surface.

[0033] When the drive mechanism 110 drives the transmission mechanism 120 to rotate, the eccentric shaft fixed on the gear performs a circular motion. The first eccentric section 122 and the second eccentric section 123, as two independent power output points, draw circles in space with the same angular velocity, acting on the output mechanism 130 respectively. In this way, by integrating the two power output points onto the same eccentric shaft, the transmission mechanism 120 can be simplified. This not only reduces the number of parts and the assembly difficulty, allowing for a slimmer and more comfortable grip on the electric compression handle, but also ensures the synchronization of the two power outputs, providing a foundation for the stable and coordinated compound motion of the brush head 500.

[0034] Please refer to Figure 3 , Figure 4 , Figure 5 and Figure 6 In one optional embodiment, the drive mechanism 110 includes a drive motor 111 and a first gear 112, and the transmission mechanism 120 further includes a second gear 124 and a rotating shaft 125. The first gear 112 is connected to the output end of the drive motor 111 and meshes with the second gear 124 for transmission. The second gear 124 is rotatably connected to the support housing 140 via the rotating shaft 125. The axis of the first gear 112 is perpendicular to the axis of the second gear 124, and an eccentric shaft is disposed on the second gear 124. Both the first gear 112 and the second gear 124 can be bevel gears, and the diameter of the second gear 124 is larger than the diameter of the first gear 112.

[0035] The second gear 124 is provided with a mounting cylinder 1241, which has a mounting through hole through which a rotating shaft 125 passes, allowing the first gear 112 to be rotatably connected to the rotating shaft 125. A first eccentric section 122 and a second eccentric section 123 are arranged around the mounting cylinder 1241, with portions of their sidewalls overlapping portions of the sidewalls of the mounting cylinder 1241. This structural design allows for a fixed connection between the first eccentric section 122 and the second eccentric section 123, and also allows both the first eccentric section 122 and the second eccentric section 123 to be hollow, helping to reduce the overall weight.

[0036] For example, a small bevel gear (first gear 112) is mounted on the output shaft of the drive motor 111, meshing with a larger diameter bevel gear (second gear 124), with the axes of the two gears perpendicular. The output shaft of the drive motor 111 is arranged along the length of the handle, the second gear 124 is vertically positioned, and an eccentric shaft is vertically mounted on the end face of the second gear 124. During operation, the drive motor 111 drives the small bevel gear to rotate, transmitting power to the large bevel gear through meshing, while simultaneously changing the direction of rotation by 90 degrees and achieving deceleration. The eccentric shaft mounted on the end face of the large bevel gear rotates accordingly, driving the subsequent output mechanism 130. In this way, the bevel gear transmission makes the extension direction of the output shaft of the drive motor 111 parallel to the length direction of the electric toothbrush, which helps to design the handle to be more ergonomic and improve grip comfort; furthermore, the cooperation of the large and small gears plays a role in deceleration and torque increase, allowing the motor to output greater torque at high speeds, ensuring that the brush head 500 can maintain strong power even when encountering greater brushing pressure and is less likely to stop.

[0037] Please continue to refer to this. Figure 7 and Figure 8 , Figure 7 This is a schematic diagram of the structure of a first conversion element 131 provided in an embodiment of this application. Figure 8 This is a schematic diagram of the structure of a second conversion member 132 provided in an embodiment of this application. In an optional embodiment, the output mechanism 130 includes a first conversion member 131, a second conversion member 132, and an output member 133. One end of the first conversion member 131 is connected to the first eccentric section 122, and the other end is movably connected to the second conversion member 132. One end of the second conversion member 132 is movably connected to the second eccentric section 123, and the other end is fixedly connected to the output member 133. The output member 133 is movably mounted on the support housing 140, and one end is fixedly connected to the second conversion member 132, while the other end extends to the outside of the support housing 140 for mounting the brush head 500. Specifically, the first conversion member 131 is a connecting rod structure, with one end sleeved on the first eccentric section 122; the second conversion member 132 is a connecting frame structure, with one end sleeved on the second eccentric section 123, and the other end fixedly connected to the output member 133 by means of snap-fit, welding, etc., or it is an integrally formed structure with the output member 133.

[0038] During the operation of the engine device 100, the rotation of the first eccentric section 122 drives the first conversion component 131 to move, and transmits force to the second conversion component 132 through its movable connection point with the second conversion component 132; at the same time, the rotation of the second eccentric section 123 directly drives the other end of the second conversion component 132. The second conversion component 132, as the force convergence point, combines the drives from both ends, driving the output rod fixedly connected to it to move along the designed trajectory under the constraint of the handle housing 200. The second conversion component 132 and the output component 133 are fixedly connected, making the power transmission from the internal transmission mechanism 120 to the brush head 500 mounting rod a rigid and lossless transmission, ensuring that the composite vibration transmitted to the brush head 500 is clear and powerful, improving cleaning efficiency and grip feel.

[0039] Please refer to Figure 3 , Figure 4 and Figure 5 In one optional embodiment, the drive mechanism 110 drives the transmission mechanism 120 to rotate around the first axis z1; the first end of the first conversion member 131 is provided with a sleeve portion 1311, which is sleeved on the first eccentric section 122 to drive the second conversion member 132 and the output member 133 to reciprocate along the first direction d1, the first direction d1 being perpendicular to the extension direction of the first axis z1; the first end of the second conversion member 132 is provided with a deflection portion 1321, which is movably sleeved on the second eccentric section 123 to drive the output member 133 to reciprocate around the second axis z2, the second axis z2 being parallel to the first direction d1 and perpendicular to the first axis z1.

[0040] Through the coordinated operation of the socket 1311 and the deflection part 1321, the rotational motion of the two eccentric segments is converted into translation and torsion, respectively. Specifically, the socket 1311 converts the rotation of the first eccentric segment 122 into a back-and-forth reciprocating pull along the length of the toothbrush, achieving axial brushing; the deflection part 1321 converts the rotation of the second eccentric segment 123 into a left-and-right reciprocating torsion around the horizontal axis, achieving radial vibration. The two motions are superimposed on the output part 133, causing the brush head 500 to move back and forth and swing left and right simultaneously.

[0041] In this way, the brushing action is decomposed into two orthogonal motions and synthesized in a relatively compact mechanical manner. The independent design of the socket 1311 and the deflection part 1321 makes the motion transmission path clear and the energy loss small, while the overall structure is simple and conducive to the miniaturization of the toothbrush handle.

[0042] Please refer to Figure 3 , Figure 4 and Figure 5In one optional embodiment, the sleeve portion 1311 has a first through hole, the shape of which is adapted to the outer peripheral shape of the first eccentric segment 122; the deflection portion 1321 has a second through hole, in which the second eccentric segment 123 is accommodated. The second through hole limits the second eccentric segment 123 in a direction perpendicular to the first direction d1 and allows the second eccentric segment 123 to slide relative to each other along the first direction d1. The first through hole is a circular hole matching the diameter of the first eccentric segment 122, and the two fit tightly together to ensure that the rotational motion of the first eccentric segment 122 can be converted into axial driving force. The second through hole is an elongated circular hole (such as a racetrack-shaped hole) extending along the first direction d1, in which the second eccentric segment 123 is accommodated; the wall of the second through hole limits the second eccentric segment 123 in a direction perpendicular to the first direction d1 to transmit lateral driving force, while leaving a gap in a direction parallel to the first direction d1 to allow the deflection portion 1321 and the second eccentric segment 123 to slide relative to each other.

[0043] When the transmission mechanism 120 rotates, the rotational motion of the first eccentric segment 122 is converted into the reciprocating translation of the output member 133 along the first direction d1. Specifically, the first eccentric segment 122 is sleeved in the sleeve portion 1311 of the first conversion member 131, and the sleeve portion 1311 has a circular hole that fits tightly with the outer periphery of the first eccentric segment 122. When the transmission mechanism 120 rotates around the first axis z1, the first eccentric segment 122 rotates eccentrically accordingly. Since the sleeve portion 1311 is constrained in the radial direction perpendicular to the first axis z1 by the output member 133 and the output circular hole 141 of the support housing 140, it cannot move relative to the eccentric segment. Therefore, the radial displacement generated by the eccentric rotation is forcibly decomposed into a periodic component along the first axis z1, thereby driving the first conversion member 131 to drive the output member 133 to perform reciprocating translational motion along the first direction d1.

[0044] Please refer to Figure 3 , Figure 4 , Figure 9 and Figure 10 , Figure 9 This is a schematic diagram of a rotational state of the second conversion element 132 provided in an embodiment of this application. Figure 10 This is a schematic diagram of another rotational state of the second conversion member 132 provided in the embodiments of this application. Figure 9 and Figure 10The movement process of the second conversion member 132 can be illustrated. The rotational motion of the second eccentric segment 123 is converted into the reciprocating rotation of the output member 133 around the second axis z2. Specifically, the second eccentric segment 123 is accommodated in the elongated hole of the deflection portion 1321 of the second conversion member 132. The elongated hole limits the second eccentric segment 123 in the direction perpendicular to the first direction d1, while leaving a sliding clearance in the first direction d1. When the transmission mechanism 120 rotates, the second eccentric segment 123 pushes the wall of the elongated hole in the component motion perpendicular to the first direction d1, generating a lateral driving force. Since the second conversion member 132 is fixedly connected to the output member 133, and the output member 133 is constrained by the support housing 140 and cannot translate in the lateral direction (the direction perpendicular to the axis of the output member 133), the lateral force cannot be converted into linear motion, but instead forms a torque around the second axis z2, forcing the output member 133 to reciprocate around the second axis z2. Meanwhile, the free travel of the elongated hole in the first direction d1 allows the second eccentric segment 123 to slide freely, avoiding additional axial interference. Thus, the translational and rotational movements are independently controlled by the two eccentric segments, without interference. This ensures the independence of the front-to-back brushing and left-to-right trembling actions, avoiding motion coupling or energy cancellation, making the cleaning action precise, efficient, and repeatable.

[0045] In one exemplary embodiment, the deflection portion 1321 is annular, and its inner sidewall encloses and forms a second through hole. The inner sidewall adopts an arc-shaped design. Specifically, the "arc-shaped" here means that in a cross section perpendicular to the first direction d1, the outline of the inner sidewall is an outwardly convex arc shape, so that the middle area of ​​the inner sidewall protrudes toward the center of the second through hole, thereby forming a surface contact with the cylindrical surface of the second eccentric segment 123.

[0046] If a planar inner wall is used (i.e., the inner wall of the hole in the section perpendicular to the first direction d1 is a straight surface), although it can theoretically still transmit lateral driving force, in the high-frequency reciprocating working environment of an electric toothbrush, a stress-concentrated line contact will form between the planar and cylindrical surfaces, leading to problems such as rapid wear, heat generation, movement stagnation, and noise. The curved inner wall, however, transforms the line contact into a surface contact, which can disperse contact stress, reduce frictional loss, thereby improving the long-term stability and durability of the engine device 100, and also reducing operating noise.

[0047] Please refer to Figure 5 , Figure 6 , Figure 7 and Figure 8In one optional embodiment, the second end of the first conversion member 131 is provided with a first mating portion 1312; the first end of the second conversion member 132 is also provided with a second mating portion 1322; the first mating portion 1312 and the second mating portion 1322 are movably connected and can rotate relative to each other in multiple directions. For example, the first mating portion 1312 is a spherical shaft, and the second mating portion 1322 is a spherical groove, with the spherical shaft accommodated within the spherical groove to form a ball joint connection.

[0048] When the first conversion element 131 is driven to reciprocate, the force is transmitted to the second conversion element 132 through the ball joint; at the same time, the second conversion element 132 is driven to swing. The ball joint allows for angular changes in any direction between the two conversion elements—whether it is a slight up-and-down movement of the first conversion element 131 or a left-and-right swing of the second conversion element 132, the spherical shaft can rotate freely within the spherical groove, ensuring that the power is always transmitted smoothly.

[0049] This ball joint structure can eliminate internal interference and jamming that may occur during the movement of the mechanism. It can reduce the internal mechanical stress of the engine unit 100 when it is running at high speed, thereby reducing noise and vibration and extending service life.

[0050] Please refer to Figure 5 In one optional embodiment, the support housing 140 is provided with a guide structure 141, and the output member 133 is slidably engaged with the guide structure 141 to constrain the output member 133 to reciprocate along a first direction d1; the output member 133 is also rotatably engaged with the support housing 140 to constrain the output member 133 to swing about a second axis z2. The end of the support housing 140 is provided with a mounting through hole, which can serve as the guide structure 141. The output member 133 can be a rod-shaped output shaft, which extends out of the support housing 140 through the through hole and forms a slidable precision fit with the inner wall of the mounting through hole.

[0051] During the operation of the engine device 100, the output shaft is internally driven, reciprocating along the axis of the mounting through hole on one hand; on the other hand, under the action of lateral torque, the output rod can wobble at a small angle within the mounting through hole, achieving reciprocating rotation around the second axis z2. The movement trajectory of the output component 133 can be limited through the mounting through hole, ensuring that the brush head 500 always runs along the designed path.

[0052] Please refer to Figure 5 and Figure 6 In one alternative embodiment, the eccentricity of the first eccentric segment 122 is greater than, equal to or less than the eccentricity of the second eccentric segment 123.

[0053] For example, the eccentricity of the first eccentric segment 122 is greater than that of the second eccentric segment 123, causing the two eccentric segments to produce different amplitudes of motion during rotation. The first eccentric segment 122, with its larger eccentricity, drives the brush head 500 to produce a larger amplitude of back-and-forth translational motion, achieving a wide-area and efficient cleaning of the tooth surface. The second eccentric segment 123, with its smaller eccentricity, drives the brush head 500 to produce a smaller amplitude of left-and-right oscillation, focusing on deep cleaning between teeth and the gingival sulcus for a more refined cleaning experience, avoiding damage to the gums. Through this differentiated design, the same toothbrush can ensure both efficient cleaning power and a gentle care experience.

[0054] In one alternative embodiment, the drive motor 111, the first gear 112, the transmission mechanism 120, the first conversion element 131, the second conversion element 132, and the output element 133 are sequentially connected and coaxially arranged along the first direction d1. It is understood that coaxial arrangement here means that for components rotating about the second axis z2, such as the output shaft of the drive motor 111, the first gear 112, the second conversion element 132, and the output element 133, their respective axes of rotation coincide with the second axis z2; for components not rotating about the second axis z2, their geometric center or central axis is located on the extension line of the second axis z2. For example, the central region of the transmission mechanism 120 in the direction perpendicular to the second axis z2 (i.e., parallel to the first axis z1), and the central axis of the first conversion element 131, both fall on the extension line of the second axis z2. Simultaneously, the length direction of the first conversion element 131 can be parallel to the first direction d1 (i.e., parallel to the second axis z2). This elongated coaxial layout allows the moving components to be sequentially connected along the axial direction, resulting in a compact structure and a short transmission chain.

[0055] When the engine device 100 is applied to an electric toothbrush, by arranging the power source (drive motor), transmission components and output components sequentially along the length direction of the handle (i.e., the first direction d1), the radial dimension of the toothbrush handle can be controlled, making the toothbrush handle slim and easy to grip; at the same time, the coaxial arrangement of each component can reduce unnecessary bending and offset, reduce energy loss and vibration noise, and improve the grip comfort and transmission efficiency when brushing teeth.

[0056] Please refer to Figure 1 This application also provides an electric toothbrush, which may include: a handle housing 200, a motor device 100, a power supply unit 300, a control board 400, and a brush head 500; the motor device 100 may be the motor device 100 in any of the above embodiments.

[0057] The engine unit 100, power supply unit 300, and control board 400 are all installed inside the handle housing 200. The power supply unit 300 is electrically connected to the control board 400 to supply power to the entire machine; the control board 400 is electrically connected to the drive mechanism 110 of the engine unit 100 to control the engine operation according to a preset program. The output component 133 of the engine unit 100 extends outside the handle housing 200 through a mounting hole, and the brush head 500 is detachably mounted to the end of the output component 133 by a snap-fit. The handle housing 200 is also provided with a function button 600, which is electrically connected to the control board 400 to receive user operation commands. In addition, a waterproof ring 700 is provided between the output component 133 and the mounting hole of the handle housing 200 to prevent external liquids from entering the handle housing 200.

[0058] When the user uses the electric toothbrush, they press the function button 600 on the handle housing 200. The control board 400 then supplies electrical energy from the power supply unit 300 to the drive motor 111 of the engine unit 100 according to the preset cleaning mode. After the drive motor 111 starts, the transmission mechanism 120, the eccentric output part 121, and the output mechanism 130 inside the engine unit 100 operate sequentially to drive the output part 133 to drive the brush head 500 to achieve a compound motion of reciprocating translation and reciprocating rotation. The brush head 500 brushes up and down along the tooth surface in the oral cavity and swings left and right around its axis to clean all surfaces of the teeth.

[0059] In this embodiment, the motor device 100 is applied to an electric toothbrush, that is, a compound motion function is achieved with a relatively simple mechanical structure through a single motor and an integrated dual-eccentric output unit 121. This reduces the number of parts, making the motor structure simpler, the overall size smaller, and the weight lighter. This not only reduces production costs and assembly difficulty, but also makes the toothbrush handle more ergonomic, thereby improving grip comfort.

[0060] In terms of cleaning performance, the electric toothbrush in this embodiment achieves a combined translational and rotational motion through a motor device 100: the translational motion can cover a larger tooth surface area, simulating the up-and-down brushing motion of manual brushing; the rotational motion can penetrate deep into the gaps between teeth and the gingival sulcus to remove plaque. This combined motion mode makes cleaning more thorough and efficient, while being gentler on the gums, thus improving the user experience.

[0061] It should be noted that the dimensions of the areas may have been exaggerated in the accompanying drawings for clarity. Furthermore, it is understood that when an element is referred to as "on top of" another element, it can be directly on the other element, or there may be intermediate elements. Additionally, it is understood that when an element is referred to as "below" another element, it can be directly below the other element, or there may be more than one intermediate element. Furthermore, it is also understood that when an element is referred to as "between" two elements, it can be the only layer between the two elements, or there may be more than one intermediate element. Similar reference numerals throughout indicate similar elements.

[0062] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "multiple" refers to two or more unless otherwise expressly defined.

[0063] The above description is merely a preferred embodiment of this application and is not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application are included within the scope of protection of this application.

Claims

1. An engine device, characterized in that, include: Drive mechanism, transmission mechanism, output mechanism, and support housing; The drive mechanism is connected to the transmission mechanism and is used to drive the transmission mechanism to rotate. The transmission mechanism has two eccentric output sections. The output mechanism is connected to the two eccentric output sections respectively, and the output mechanism is movably mounted on the support housing; The drive mechanism is used to drive the output mechanism to reciprocate translation and rotation relative to the support housing through the two eccentric output parts.

2. The engine device according to claim 1, characterized in that, The transmission mechanism has an eccentric shaft, and the two eccentric output sections are a first eccentric section and a second eccentric section arranged along the axial direction of the eccentric shaft.

3. The engine device according to claim 2, characterized in that, The output mechanism includes a first conversion element, a second conversion element, and an output element; One end of the first conversion component is connected to the first eccentric section, and the other end is movably connected to the second conversion component; One end of the second conversion component is movably connected to the second eccentric section, and the other end is fixedly connected to the output component; The output component is movably mounted on the support housing, with one end fixedly connected to the second conversion component and the other end extending to the outside of the support housing.

4. The engine device according to claim 3, characterized in that, The drive mechanism drives the transmission mechanism to rotate around the first axis; The first end of the first conversion component is provided with a sleeve portion, which is sleeved on the first eccentric section to drive the second conversion component and the output component to reciprocate and translate along a first direction, which is perpendicular to the extension direction of the first axis. The first end of the second conversion component is provided with a deflection part, which is movably sleeved on the second eccentric section to drive the output component to reciprocate around the second axis, the second axis being parallel to the first direction.

5. The engine device according to claim 4, characterized in that, The sleeve portion has a first through hole, the shape of which is adapted to the outer peripheral shape of the first eccentric segment; The deflection portion has a second through hole, in which the second eccentric segment is accommodated. The second through hole limits the second eccentric segment in a direction perpendicular to the first direction and allows the second eccentric segment to slide relative to the first direction.

6. The engine device according to claim 4, characterized in that, The second end of the first conversion component is provided with a first mating part; The first end of the second conversion component is also provided with a second mating part; The first mating part and the second mating part are movably connected and can rotate relative to each other in multiple directions.

7. The engine device according to claim 4, characterized in that, The supporting housing is provided with a guide structure, and the output component is slidably engaged with the guide structure to constrain the output component to reciprocate along the first direction; the output component is also rotatably engaged with the supporting housing to constrain the output component to swing around the second axis.

8. The engine device according to claim 2, characterized in that, The eccentricity of the first eccentric segment is greater than, equal to or less than the eccentricity of the second eccentric segment.

9. The engine device according to claim 4, characterized in that, The drive mechanism includes a drive motor and a first gear, and the transmission mechanism further includes a second gear and a rotating shaft; The first gear is connected to the output end of the drive motor and meshes with the second gear for transmission; The second gear is rotatably connected to the support housing via the rotating shaft, the axis of the first gear is perpendicular to the axis of the second gear, and the eccentric shaft is disposed on the second gear; The drive motor, the first gear, the transmission mechanism, the first conversion component, the second conversion component, and the output component are sequentially connected and coaxially arranged along the first direction.

10. An electric toothbrush, characterized in that, include: Handle housing, engine assembly according to any one of claims 1 to 9, power supply unit, control panel, and brush head; The engine unit, the power supply unit, and the control board are all installed inside the handle housing, and the brush head is detachably connected to the engine unit.

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