Transmission assembly and oral irrigator

Abstract

The utility model discloses a transmission assembly and a water pick, the transmission assembly comprises a driving wheel, a driven wheel and a crank, and the driven wheel is in driving connection with the driving wheel; an eccentric wheel is arranged on the end face of the driven wheel in a protruding mode, the crank is provided with an input end and an output end which are opposite, the input end is provided with an installation opening corresponding to the eccentric wheel, and at least part of the eccentric wheel rotates in the installation opening so that the output end can make reciprocating motion in the first direction. And the contact points of the outer peripheral surface of the eccentric wheel and the inner wall surface of the mounting opening form at least one straight line or curve. According to the technical scheme, the risk that the crank and the eccentric wheel are adhered through hot melting and even stuck can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of oral irrigators, in particular to a transmission component and an oral irrigator. Background Art

[0002] The water flosser usually includes a nozzle, a water tank, a water pump, a driving member and a transmission assembly. The water pump is connected between the nozzle and the water tank. The driving member drives the water pump through the transmission assembly to pump the water in the water tank out of the nozzle to achieve flushing and cleaning of the teeth and the oral cavity. The transmission assembly includes a crank and an eccentric wheel made of plastic. The crank is adapted to be mounted on the outer peripheral surface of the eccentric wheel. During the working movement of the transmission assembly, a large amount of heat will be generated on the contact mating surface of the crank and the eccentric wheel. If the heat cannot be dissipated in time, the local temperature of the crank and the eccentric wheel in the contact area will rise sharply, causing hot melt adhesion or even jamming. Utility Model Content

[0003] The main purpose of the utility model is to provide a transmission assembly, aiming to reduce the risk of hot-melt adhesion or even jamming of a crank and an eccentric wheel.

[0004] In order to achieve the above-mentioned purpose, the transmission assembly proposed in the utility model is applied to a water flosser, and the transmission assembly comprises:

[0005] Driving wheel;

[0006] A driven wheel drivingly connected to the driving wheel; and

[0007] A crank, an eccentric wheel is convexly provided on the end face of the driven wheel, the crank has an input end and an output end relative to each other, the input end is provided with a mounting opening corresponding to the eccentric wheel, the eccentric wheel at least partially rotates in the mounting opening to cause the output end to reciprocate along a first direction, and the contact points between the outer peripheral surface of the eccentric wheel and the inner wall surface of the mounting opening form at least one straight line or curve setting.

[0008] Optionally, the outer peripheral surface of the eccentric wheel is arranged as an outwardly convex arc surface.

[0009] Optionally, the mounting opening is configured as an elongated hole having a long axis, and the long axis direction of the elongated hole is arranged to intersect with the first direction.

[0010] Optionally, the elongated hole is configured as an elliptical hole or an oval hole.

[0011] Optionally, the outer peripheral surface of the eccentric wheel is configured as a cylindrical surface.

[0012] Optionally, the mounting opening is configured as an outer polygonal hole, and the eccentric wheel is slidably abutted against a wall surface between two adjacent corners of the outer polygonal hole.

[0013] Optionally, the mounting opening is configured as an inner polygonal hole, and the eccentric wheel slides against the inner corners of the inner polygonal hole.

[0014] Optionally, the inner wall surface of the installation opening is configured as an outwardly convex arc surface.

[0015] Optionally, the eccentric wheel is configured as an outer polygonal cylinder.

[0016] Optionally, the inner wall surface of the mounting opening is configured as a cylindrical surface, and is in a circumscribed circle relationship with the cross section of the outer polygonal cylinder.

[0017] Optionally, the eccentric wheel is configured as an inner polygonal cylinder.

[0018] Optionally, the outer peripheral surface of the eccentric wheel and / or the inner wall surface of the mounting opening are provided with a wear-resistant structure.

[0019] Optionally, the wear-resistant structure is configured as a metal ring, and the metal ring is adapted to be arranged on the outer peripheral surface of the eccentric wheel or the inner wall surface of the installation opening.

[0020] Optionally, the wear-resistant structure is configured as a wear-resistant coating, and the wear-resistant coating is provided on the outer peripheral surface of the eccentric wheel or the inner wall surface of the mounting opening.

[0021] Optionally, the driving wheel is configured as a bevel gear, the driven wheel is configured as a face gear, and the bevel gear is meshingly connected with the face gear.

[0022] The utility model also provides a water flosser, comprising the aforementioned transmission assembly.

[0023] In the technical solution of the utility model, since the contact and matching relationship between the eccentric wheel and the crank is changed from surface contact to line contact, the area of ​​the contact and matching region between the eccentric wheel and the mounting port is significantly reduced, so the heat generated when the two move relative to each other is reduced. And since a small amount of heat can be dissipated in time, the risk of the crank and the eccentric wheel being hot-melted and even stuck due to a sharp rise in the local temperature in the contact area can be reduced. Secondly, the degree of wear of the crank and the eccentric wheel during relative movement can be reduced, which is conducive to increasing the service life of the transmission component. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0025] Figure 1This is a schematic structural diagram of the first embodiment of the oral rinser of the utility model;

[0026] Figure 2 for Figure 1 a top view of the illustrated embodiment;

[0027] Figure 3 for Figure 2 Sectional view at AA in the middle;

[0028] Figure 4 for Figure 1 A schematic diagram of the matching relationship between the eccentric wheel and the crank in the illustrated embodiment;

[0029] Figure 5 This is a schematic diagram of the matching relationship between the eccentric wheel and the crank in the second embodiment of the transmission assembly of the utility model;

[0030] Figure 6 This is a schematic diagram of the matching relationship between the eccentric wheel and the crank in the third embodiment of the transmission assembly of the utility model;

[0031] Figure 7 This is a schematic diagram of the matching relationship between the eccentric wheel and the crank in the fourth embodiment of the transmission assembly of the utility model;

[0032] Figure 8 This is a schematic diagram of the matching relationship between the eccentric wheel and the crank in the fifth embodiment of the transmission assembly of the utility model.

[0033] Description of Figure Numbers:

[0034] Label name Label name 11 case 20 Transmission components 12 Drive parts 21 Driving wheel 13 Water Pump 22 Driven wheel 131 Pump body 221 Eccentric wheel 132 Elastic diaphragm 23 crank 133 Pump water chamber 23a Input 134 Water Inlet 23b Output 135 Water outlet 231 Mounting port

[0035] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0037] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0038] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0040] The water flosser usually includes a nozzle, a water tank, a water pump, a driving member and a transmission assembly. The water pump is connected between the nozzle and the water tank. The driving member drives the water pump through the transmission assembly to pump the water in the water tank out of the nozzle to achieve flushing and cleaning of the teeth and the oral cavity. The transmission assembly includes a crank and an eccentric wheel made of plastic. The crank is adapted to be mounted on the outer peripheral surface of the eccentric wheel. During the working movement of the transmission assembly, a large amount of heat will be generated on the contact mating surface of the crank and the eccentric wheel. If the heat cannot be dissipated in time, the local temperature of the crank and the eccentric wheel in the contact area will rise sharply, causing hot melt adhesion or even jamming.

[0041] In view of this, the utility model proposes a transmission assembly, which is applied to a water flosser. Figures 1 to 3 The water flosser includes a shell 11, a water pump 13 and a driving member 12. The driving member 12 is arranged in the shell 11. The transmission assembly 20 connects the driving member 12 and the water pump 13 to transmit the power of the driving member 12 to the water pump 13 and enable the water pump 13 to realize the function of pumping water externally.

[0042] Please refer to Figures 1 to 4 In the first embodiment of the utility model, the transmission assembly 20 includes:

[0043] Driving wheel 21;

[0044] The driven wheel 22 is drivingly connected to the driving wheel 21; and

[0045] The crank 23 and the driven wheel 22 have an eccentric wheel 221 protruding from their end faces. The crank 23 has an input end 23a and an output end 23b relative to each other. The input end 23a is provided with a mounting opening 231 corresponding to the eccentric wheel 221. The eccentric wheel 221 at least partially rotates in the mounting opening 231 to cause the output end 23b to reciprocate along a first direction. The contact points between the outer peripheral surface of the eccentric wheel 221 and the inner wall surface of the mounting opening 231 form at least one straight line or curve setting, that is, the contact and matching relationship between the eccentric wheel 221 and the crank 23 is a line contact.

[0046] In the technical solution of the utility model, since the contact and matching relationship between the eccentric wheel 221 and the crank 23 is changed from surface contact to line contact, the area of ​​the contact and matching region between the eccentric wheel 221 and the mounting port 231 is significantly reduced, so the heat generated when the two move relative to each other is reduced. Since a small amount of heat can be dissipated in time, the risk of hot melt adhesion or even jamming caused by a sharp rise in the local temperature of the crank 23 and the eccentric wheel 221 in the contact area can be reduced. Secondly, the degree of wear of the crank 23 and the eccentric wheel 221 during relative movement can be reduced, which is conducive to improving the service life of the transmission assembly 20.

[0047] For details, please refer to Figures 1 to 3 In the embodiment of the utility model, the water pump 13 includes a pump body 131 and an elastic diaphragm 132. The pump body 131 is provided with a water pumping cavity 133, a water inlet 134 and a water outlet 135 connected to the water pumping cavity 133. The elastic diaphragm 132 is arranged in the water pumping cavity 133. A pumping space is formed between the inner wall surface of the elastic diaphragm 132 and the cavity wall surface of the water pumping cavity 133. The elastic diaphragm 132 is driven and connected to the output end 23b of the crank 23 so as to be elastically deformed relative to the water pumping cavity 133 to periodically change the size of the pumping space, thereby prompting water to flow into the water pumping cavity 133 from the water inlet 134, and then flow out of the water pumping cavity 133 from the water outlet 135, and complete the function of pumping water. Of course, the pump body 131 of the utility model can also be applied to other forms of water pumps 13 and water flossers, not limited to the above-mentioned structural forms.

[0048] Please refer to Figure 2 and Figure 4 In the first embodiment, the outer peripheral surface of the eccentric wheel 221 is configured as an outer convex arc surface. In this way, the outer peripheral surface of the eccentric wheel 221 is designed as an outer convex arc surface, which is convenient for its processing and molding, and is conducive to improving the smoothness of the eccentric wheel 221 when rotating in the installation opening 231. In this embodiment, the outer peripheral surface of the eccentric wheel 221 can be configured as a cylindrical surface, an elliptical cylindrical surface, etc. Preferably, the outer peripheral surface of the eccentric wheel 221 is configured as a cylindrical surface.

[0049] Please refer to Figure 4In this embodiment, the installation opening 231 is optionally configured as a long strip hole with a long axis, and the long axis direction of the long strip hole is arranged to intersect with the first direction. In this way, the gap between the inner wall surface of the installation opening 231 and the side wall surface of the eccentric wheel 221 in the first direction can be reduced or even eliminated, thereby facilitating the smoothness of the eccentric wheel 221 when rotating in the installation opening 231. Of course, in other embodiments, the long axis direction of the long strip hole can also be arranged parallel to the first direction.

[0050] Further optionally, the short axis direction of the long strip hole is arranged parallel to the first direction, and the two opposite side walls of the long strip hole in the short axis direction are respectively abutted against the two opposite side walls of the eccentric wheel 221. That is, in the first direction, there is no gap between the side wall surface of the eccentric wheel 221 and the side wall surface of the long strip hole, and at this time, the contact point between the outer peripheral surface of the eccentric wheel 221 and the inner wall surface of the installation opening 231 constitutes two opposite straight lines or curves; and in the long axis direction of the long strip hole, there is a gap between the side wall surface of the eccentric wheel 221 and the side wall surface of the long strip hole. In this way, the problem of the eccentric wheel 221 shaking randomly in the installation opening 231 during the operation of the transmission assembly 20 can be avoided, thereby improving the movement smoothness and stability of the transmission assembly 20. Of course, in other embodiments, there can also be a gap between the side wall surface of the eccentric wheel 221 and the side wall surface of the long strip hole in the first direction.

[0051] In this embodiment, the elongated hole is optionally configured as an elliptical hole or a round hole. In this way, the processing and forming of the mounting opening 231 is facilitated, and the structural stress concentration problem of the eccentric wheel 221 at the mounting opening 231 can be avoided. Of course, in other embodiments, the elongated hole can also be configured as a rectangular hole.

[0052] Please refer to Figure 4 In this embodiment, the elongated hole is optionally configured as an elliptical hole, the outer peripheral surface of the eccentric wheel 221 is configured as a cylindrical surface, and the diameter of the cylindrical surface is equal to the minor axis length of the elliptical hole. In this way, the structure is simple and easy to assemble. It can be understood that when the eccentric wheel 221 is in Figure 4 In the position shown, the contact points between the outer peripheral surface of the eccentric wheel 221 and the inner wall surface of the mounting opening 231 form two opposite straight lines, and the two straight lines are relatively distributed along the minor axis direction of the elliptical hole.

[0053] Please refer to Figure 5 In the second embodiment, the installation opening 231 may be configured as an outer polygonal hole, and the eccentric wheel 221 may slide against the wall surface between two adjacent corners of the outer polygonal hole. That is, the inner wall surface of the installation opening 231 is an outer polygonal prism. In this case, the outer peripheral surface of the eccentric wheel 221 may be a regular outer convex surface such as a cylindrical surface or an elliptical cylindrical surface, or an irregular curved surface, which is not specifically limited in this application. Figure 5In the embodiment shown, the outer peripheral surface of the eccentric wheel 221 is a cylindrical surface, and the cylindrical surface is inscribed in the outer polygonal hole. At this time, the number of straight lines formed by the contact points between the outer peripheral surface of the eccentric wheel 221 and the inner wall surface of the mounting opening 231 is the number of sides of the outer polygon, and the contact straight lines pass through the corresponding side midpoints. Figure 5 In the illustrated embodiment, the mounting opening 231 is a regular outer hexagonal hole, so the contact points between the outer peripheral surface of the eccentric wheel 221 and the inner wall surface of the mounting opening 231 form six straight lines, and these six straight lines are distributed one by one at the midpoint of each side of the regular outer hexagon.

[0054] Of course, the installation opening 231 may not be a regular outer polygon hole, in which case the number of straight lines formed by the contact points between the outer peripheral surface of the eccentric wheel 221 and the inner wall surface of the installation opening 231 is less than the number of sides of the outer polygon.

[0055] Please refer to Figure 6 In the third embodiment, the mounting opening 231 is configured as an inner polygonal hole, and the eccentric wheel 221 slides against the inner corner of the inner polygonal hole. That is, the inner wall surface of the mounting opening 231 is an inner polygonal prism. At this time, the outer peripheral surface of the eccentric wheel 221 can be a regular convex surface such as a cylindrical surface or an elliptical cylindrical surface, or an irregular curved surface, which is not specifically limited in this application. Figure 6 In the embodiment shown, the outer peripheral surface of the eccentric wheel 221 is a cylindrical surface, and the cylindrical surface is inscribed on the inner corners of the inner polygon hole. At this time, the number of straight lines formed by the contact points between the outer peripheral surface of the eccentric wheel 221 and the inner wall surface of the installation opening 231 is the number of inner corners of the inner polygon, and the contact straight lines pass through the corresponding inner corners. Figure 6 In the illustrated embodiment, the mounting opening 231 is a regular icosagonal hole, so the contact points between the outer peripheral surface of the eccentric wheel 221 and the inner wall surface of the mounting opening 231 form ten straight lines, and these ten straight lines are distributed one by one on each inner corner of the regular icosagon.

[0056] Of course, the installation opening 231 may not be a regular inner polygon hole, and the number of straight lines formed by the contact points between the outer peripheral surface of the eccentric wheel 221 and the inner wall surface of the installation opening 231 is less than the number of inner corners of the inner polygon.

[0057] Please refer to Figure 7 In the fourth embodiment, the inner wall surface of the installation opening 231 is set as an outer convex arc surface, such as an elliptical cylinder or a cylindrical surface, and the eccentric wheel 221 is configured as an outer polygonal cylinder. Further optionally, the inner wall surface of the installation opening 231 is set as a cylindrical surface, and is in a circumscribed circle relationship with the cross section of the outer polygonal cylinder. That is, Figure 7In the embodiment shown, the eccentric wheel 221 is an outer polygonal cylinder, and the inner wall surface of the mounting opening 231 is circumscribed on the corners of the outer polygonal cylinder. At this time, the number of straight lines formed by the contact points between the outer peripheral surface of the eccentric wheel 221 and the inner wall surface of the mounting opening 231 is the number of corners of the outer polygon, and the contact straight lines pass through the corresponding corners. Figure 7 In the illustrated embodiment, the eccentric wheel 221 is a regular outer hexagonal cylinder, so the contact points between the outer peripheral surface of the eccentric wheel 221 and the inner wall surface of the mounting opening 231 form six straight lines, and these six straight lines are distributed one by one on each corner of the regular outer hexagon.

[0058] Of course, the installation opening 231 may not be a regular outer polygon hole, in which case the number of straight lines formed by the contact points between the outer peripheral surface of the eccentric wheel 221 and the inner wall surface of the installation opening 231 is less than the number of corners of the outer polygon.

[0059] Please refer to Figure 8 In the fifth embodiment, the inner wall surface of the installation opening 231 is set as an outer convex arc surface, and the eccentric wheel 221 is configured as an inner polygonal cylinder. Further optionally, the inner wall surface of the installation opening 231 is set as a cylindrical surface, and is in a circumscribed circle relationship with the cross section of the inner polygonal cylinder. That is, Figure 8 In the embodiment shown, the eccentric wheel 221 is an inner polygonal cylinder, and the inner wall surface of the mounting opening 231 is circumscribed on the outer corners of the inner polygonal cylinder. At this time, the number of straight lines formed by the contact points between the outer peripheral surface of the eccentric wheel 221 and the inner wall surface of the mounting opening 231 is the number of outer corners of the inner polygon, and the contact straight lines pass through the corresponding outer corners. Figure 8 In the illustrated embodiment, the eccentric wheel 221 is a regular icosagonal cylinder, so the contact points between the outer peripheral surface of the eccentric wheel 221 and the inner wall surface of the mounting opening 231 form ten straight lines, and these ten straight lines are distributed one by one on each outer corner of the regular icosagon.

[0060] In order to reduce the degree of wear of the eccentric wheel 221 and the mounting opening 231 and to increase the service life of the transmission assembly 20, in the embodiment of the utility model, optionally, the outer peripheral surface of the eccentric wheel 221 and / or the inner wall surface of the mounting opening 231 are provided with a wear-resistant structure (not shown in the drawings). Further optionally, the wear-resistant structure is configured as a metal ring, which is adapted to be arranged on the outer peripheral surface of the eccentric wheel 221 or the inner wall surface of the mounting opening 231. It can be understood that the metal ring has good thermal conductivity, so the heat generated by the eccentric wheel 221 when rotating in the mounting opening 231 can be timely discharged to achieve a good thermal conductivity effect, and further reduce the risk of hot melt adhesion or even jamming due to a sharp rise in the local temperature of the crank 23 and the eccentric wheel 221 in the contact area.

[0061] Of course, in other embodiments, the wear-resistant structure can also be configured as a wear-resistant coating, which is disposed on the outer peripheral surface of the eccentric wheel 221 or the inner wall surface of the mounting opening 231. Alternatively, the wear-resistant structure includes both a metal ring and a wear-resistant coating.

[0062] In the embodiment of the utility model, it is optionally characterized in that the driving wheel 21 is configured as a bevel gear, the driven wheel 22 is configured as a face gear, and the bevel gear is meshingly connected with the face gear. In this way, the torque transmission can be made smoother and more stable through the gear transmission structure, and it is beneficial to reduce its operating noise. Secondly, since the axes of the bevel gear and the face gear intersect, the torque reversal can be achieved, which is beneficial to the flattened structural design of the water flosser. Of course, in other embodiments, the driving wheel 21 and the driven wheel 22 can also be connected by a belt, that is, the driving wheel 21 and the driven wheel 22 are a pulley structure.

[0063] The utility model also provides a dental flosser, which includes a driving member and the aforementioned transmission assembly. The specific structure of the transmission assembly refers to the above embodiment. Since the dental flosser adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here. Among them, the driving wheel of the transmission assembly is arranged on the rotating shaft of the driving member.

[0064] The above description is only an optional embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A transmission assembly, applied to a water flosser, characterized in that: The transmission assembly comprises: Driving wheel; A driven wheel drivingly connected to the driving wheel; and A crank, an eccentric wheel is convexly provided on the end face of the driven wheel, the crank has an input end and an output end relative to each other, the input end is provided with a mounting opening corresponding to the eccentric wheel, the eccentric wheel at least partially rotates in the mounting opening to cause the output end to reciprocate along a first direction, and the contact points between the outer peripheral surface of the eccentric wheel and the inner wall surface of the mounting opening form at least one straight line or curve setting.

2. The transmission assembly according to claim 1, characterized in that: The outer peripheral surface of the eccentric wheel and / or the inner wall surface of the installation opening are provided with a wear-resistant structure.

3. The transmission assembly according to claim 2, characterized in that: The wear-resistant structure is configured as a metal ring, and the metal ring is adapted to be arranged on the outer peripheral surface of the eccentric wheel or the inner wall surface of the installation opening.

4. The transmission assembly according to claim 2, characterized in that: The wear-resistant structure is configured as a wear-resistant coating, and the wear-resistant coating is arranged on the outer peripheral surface of the eccentric wheel or the inner wall surface of the installation opening.

5. The transmission assembly according to claim 1, characterized in that: The driving wheel is configured as a bevel gear, the driven wheel is configured as a face gear, and the bevel gear is meshingly connected with the face gear.

6. The transmission assembly according to claim 1, characterized in that: The outer peripheral surface of the eccentric wheel is arranged in the form of an outer convex arc surface.

7. The transmission assembly according to claim 6, characterized in that: The installation opening is configured as a long strip hole having a long axis, and the long axis direction of the long strip hole is arranged to intersect with the first direction.

8. The transmission assembly according to claim 7, characterized in that: The elongated hole is configured as an elliptical hole or a round hole; And / or, the outer peripheral surface of the eccentric wheel is configured as a cylindrical surface.

9. The transmission assembly according to claim 6, characterized in that: The installation opening is configured as an outer polygonal hole, and the eccentric wheel is slidably abutted against the wall surface between two adjacent corners of the outer polygonal hole; And / or, the mounting opening is configured as an inner polygonal hole, and the eccentric wheel is slidably abutted against the inner corners of the inner polygonal hole.

10. The transmission assembly according to claim 1, characterized in that: The inner wall surface of the installation opening is arranged in the form of an outwardly convex arc surface.

11. The transmission assembly according to claim 10, characterized in that: The inner wall surface of the mounting opening is arranged in a cylindrical surface, the eccentric wheel is configured as an outer polygonal cylinder or an inner polygonal cylinder, and the cylindrical surface is in an circumscribed circle relationship with the cross section of the outer polygonal cylinder or the inner polygonal cylinder.

12. A water flosser, characterized in that: Comprising a transmission assembly as described in any one of claims 1-11.

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