Transmission assembly and oral irrigator

Abstract

The transmission assembly comprises a shell, a driven wheel and a crank, and the shell is provided with a mounting cavity; the driven wheel is arranged in the mounting cavity and is in driving connection with a driving piece of the oral irrigator, and an eccentric wheel is convexly arranged on the end surface of the driven wheel; 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, the eccentric wheel at least partially rotates in the installation opening to promote the output end to reciprocate in the first direction, the rotation axis of the eccentric wheel extends in the second direction, and the second direction intersects with the first direction; a limiting convex part is arranged on the inner wall surface of the mounting cavity, and at least part of the edge of the mounting opening and / or the eccentric wheel is opposite to the limiting convex part in the second direction so as to limit displacement of the crank and the eccentric wheel in the second direction. According to the technical scheme, the risk that the eccentric wheel and the crank are dislocated, disengaged or 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] A 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. The mounting opening of the crank is adapted to be arranged on the outer peripheral surface of the eccentric wheel. When the eccentric wheel rotates in the mounting opening, the input end of the eccentric wheel and / or the crank tends to slide away from each other along the axial direction of the eccentric wheel, which can easily lead to the eccentric wheel being out of position in the mounting opening, or even the eccentric wheel being completely out of the mounting opening, or the eccentric wheel and the crank being stuck to each other. Utility Model Content

[0003] The main purpose of the utility model is to provide a transmission assembly, aiming to reduce the risk of misalignment, separation or jamming between the eccentric wheel and the crank.

[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] A housing having a mounting cavity;

[0006] A driven wheel, disposed in the mounting cavity and drivingly connected to the driving member of the dental flosser, an eccentric wheel convexly disposed on the end surface of the driven wheel; and

[0007] A crank, wherein the crank has an input end and an output end opposite 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 rotation axis of the eccentric wheel extends along a second direction, and the second direction is arranged to intersect with the first direction;

[0008] The inner wall surface of the installation cavity is provided with a limiting protrusion, and the edge of the installation opening and / or the eccentric wheel is at least partially arranged opposite to the limiting protrusion in the second direction to limit the displacement of the crank and the eccentric wheel in the second direction.

[0009] Optionally, the input end has a first end face and a second end face relative to each other, the mounting opening is configured as a mounting through hole passing through the first end face and the second end face, the limiting protrusion includes a first protrusion, the first end face is away from the driven wheel and is at least partially arranged opposite to the first protrusion.

[0010] Optionally, the eccentric wheel has a third end face away from the driven wheel, the third end face is exposed in the mounting through hole, and is at least partially arranged opposite to the first protrusion.

[0011] Optionally, the first end surface and the third end surface are arranged flush with each other.

[0012] Optionally, the first end surface and the first convex portion are spaced apart in the second direction, and / or the third end surface and the first convex portion are spaced apart in the second direction.

[0013] Optionally, the driven wheel has a fourth end face and a fifth end face opposite to each other, the eccentric wheel is arranged on the fourth end face, and the limiting protrusion includes a second protrusion, and the second protrusion is arranged opposite to a part of the fifth end face in the second direction.

[0014] Optionally, a positioning protrusion is provided on the fifth end surface corresponding to the second protrusion, and the positioning protrusion is arranged opposite to the second protrusion.

[0015] Optionally, the positioning protrusion and the second protrusion are arranged at intervals in the second direction.

[0016] Optionally, the limiting protrusion also includes a third protrusion, and the third protrusion and the second protrusion are arranged on the same side of the installation cavity. The third protrusion is arranged on the outer periphery of the second protrusion and is arranged opposite to the outer edge of the fifth end face in the second direction.

[0017] Optionally, the third protrusion and the fifth end surface are spaced apart in the second direction.

[0018] Optionally, the eccentric wheel has a third end face away from the driven wheel, the third end face is exposed in the mounting through hole, the driven wheel is provided with an axial hole, one end of the axial hole passes through the third end face, the first protrusion is provided with a first socket corresponding to the axial hole, and the transmission assembly also includes a pin shaft passing through the axial hole, and the first end of the pin shaft is inserted in the first socket hole.

[0019] Optionally, the other end of the axial hole passes through the fifth end surface, the second protrusion is provided with a second plug hole corresponding to the axial hole, and the second end of the pin shaft is inserted into the second plug hole.

[0020] Optionally, the end surface of the second end of the pin shaft abuts against the second plug hole, and the end surface of the first end is spaced apart from the bottom wall surface of the first plug hole.

[0021] Optionally, the transmission assembly also includes a driving wheel arranged on the rotating shaft of the driving member, the driving wheel is configured as a bevel gear, the driven wheel is configured as a face gear, the bevel gear is meshingly connected with the face gear; the face gear is arranged on the side of the bevel gear close to the second socket, and the tooth surface of the face gear is arranged toward the first socket.

[0022] Optionally, the crank is arranged on a side of the face gear having a tooth surface.

[0023] Optionally, the pin shaft is relatively fixedly arranged in the first insertion hole and the second insertion hole, and there is a gap between the outer peripheral surface of the pin shaft and the hole wall surface of the shaft hole.

[0024] Optionally, the input end has a first end face and a second end face relative to each other, the mounting opening is configured as a mounting blind hole passing through the second end face, the limiting protrusion includes a first protrusion, the first end face is away from the driven wheel and is at least partially arranged opposite to the first protrusion, and the second end face abuts against the end face of the driven wheel.

[0025] The utility model also provides a water flosser, comprising the aforementioned transmission assembly.

[0026] Optionally, the oral irrigator further includes a mounting shell and a driving member, the mounting shell and the shell of the transmission assembly are configured as the same structure, the driving member is disposed in the mounting cavity of the mounting shell, and the driving wheel of the transmission assembly is disposed on the rotating shaft of the driving member.

[0027] In the technical solution of the utility model, by arranging a limiting protrusion on the inner wall surface of the installation cavity, the tendency of the input end of the eccentric wheel and / or the crank to slide along the second direction and away from each other can be specifically limited, thereby reducing the risk of the aforementioned misalignment, detachment or jamming between the eccentric wheel and the crank. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] 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.

[0029] Figure 1 It is a structural schematic diagram of an embodiment of the tooth flosser of the utility model;

[0030] Figure 2 for Figure 1 The internal structure schematic diagram of the embodiment shown after the second shell portion is hidden;

[0031] Figure 3 for Figure 2 a top view of the structure shown;

[0032] Figure 4 for Figure 3 The cross-sectional view at AA in the middle, at this time the second shell is unhidden;

[0033] Figure 5 for Figure 4 A partial enlarged view of point B in the middle;

[0034] Figure 6 for Figure 2 An exploded view of the transmission assembly, the driving member and the first shell portion;

[0035] Figure 7 for Figure 1 Schematic diagram of the internal structure of the second shell portion.

[0036] Description of Figure Numbers:

[0037]

[0038] 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

[0039] 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.

[0040] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0041] 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.

[0042] 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.

[0043] A 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. The mounting opening of the crank is adapted to be arranged on the outer peripheral surface of the eccentric wheel. When the eccentric wheel rotates in the mounting opening, the input end of the eccentric wheel and / or the crank tends to slide away from each other along the axial direction of the eccentric wheel, which can easily lead to the eccentric wheel being out of position in the mounting opening, or even the eccentric wheel being completely out of the mounting opening, or the eccentric wheel and the crank being stuck to each other.

[0044] In view of this, the present invention proposes a transmission assembly 20, which is applied to a water flosser. Figures 1 to 3 The water flosser includes a shell 10, a nozzle, a water tank, a water pump 30 and a driving member 101. The driving member 101 is arranged on the shell 10. The transmission assembly 20 connects the driving member 101 and the water pump 30 to transmit the power of the driving member 101 to the water pump 30, and enables the water pump 30 to deliver the water in the water tank to the nozzle, and then spray it outward through the nozzle.

[0045] Please refer to Figures 1 to 7 In one embodiment of the present utility model, the transmission assembly 20 includes:

[0046] The housing 10 has a mounting cavity 11;

[0047] A driven wheel 22 is disposed in the mounting cavity 11 and is drivingly connected to the driving member 101 of the dental flosser. An eccentric wheel 221 is convexly disposed on the end surface of the driven wheel 22; and

[0048] A crank 23, wherein the crank 23 has an input end 23a and an output end 23b opposite to each other, wherein the input end 23a is provided with a mounting opening 231 corresponding to the eccentric wheel 221, wherein 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, and wherein a rotation axis of the eccentric wheel 221 extends along a second direction, wherein the second direction intersects with the first direction;

[0049] The inner wall of the installation cavity 11 is provided with a limiting protrusion 12, and the edge of the installation opening 231 and / or the eccentric wheel 221 are at least partially arranged opposite to the limiting protrusion 12 in the second direction to limit the displacement of the crank 23 and the eccentric wheel 221 in the second direction.

[0050] In the technical solution of the utility model, by providing a limiting protrusion 12 on the inner wall surface of the mounting cavity 11, the tendency of the eccentric wheel 221 and / or the input end 23a of the crank 23 to slide along the second direction and away from each other can be specifically limited, thereby reducing the risk of the aforementioned misalignment, detachment or jamming between the eccentric wheel 221 and the crank 23.

[0051] Please refer to Figure 4 Specifically, optionally, the water pump 30 includes a pump body 31 and an elastic diaphragm 32. The elastic diaphragm 32 is driven and connected to the output end 23b of the crank 23 so as to be able to undergo periodic elastic deformation relative to the pump body 31, thereby causing the water in the water tank to flow from the water tank into the pump body 31 and flow out of the nozzle from the pump body 31 to complete the function of pumping water.

[0052] Please refer to Figures 4 to 6 In one embodiment, the input end 23a has a first end face 201 and a second end face 202 opposite to each other, the mounting opening 231 is configured as a mounting through hole penetrating the first end face 201 and the second end face 202, and the limiting protrusion 12 includes a first protrusion 121, and the first end face 201 is away from the driven wheel 22 and at least partially arranged opposite to the first protrusion 121. That is, the first protrusion 121 and the driven wheel 22 can limit the displacement of the input end 23a of the crank 23 in the second direction, thereby reducing the risk of the aforementioned misalignment, separation or jamming between the eccentric wheel 221 and the crank 23. Secondly, the structure is simple and the eccentric wheel 221 and the crank 23 are easy to install. Furthermore, since the end face of the eccentric wheel 221 away from the driven wheel 22 is exposed in the mounting through hole, the first protrusion 121 can also limit the displacement of the eccentric wheel 221 in the second direction.

[0053] In this embodiment, optionally, the second end face 202 abuts against the end face of the driven wheel 22. That is, the end face of the driven wheel 22 close to the eccentric wheel 221 and the first protrusion 121 are in a clamping posture to limit the displacement of the input end 23a of the crank 23 in the second direction. Of course, in other embodiments, the second end face 202 and the end face of the driven wheel 22 close to the eccentric wheel 221 may be spaced apart from each other in the second direction by a gap.

[0054] Of course, the installation opening 231 can also be configured as a blind hole structure. For example, in another embodiment, the input end 23a has a first end face 201 and a second end face 202 opposite to each other, and the installation opening 231 is configured as a blind installation hole that penetrates the second end face 202. The limiting protrusion 12 includes a first protrusion 121, and the first end face 201 is away from the driven wheel 22 and at least partially arranged opposite to the first protrusion 121. At this time, the end face of the eccentric wheel 221 away from the driven wheel 22 is hidden in the installation blind hole. In this embodiment, when the end face abuts against the bottom surface of the installation blind hole, it is equivalent to the first protrusion 121 indirectly limiting the displacement of the eccentric wheel 221 in the second direction via the input end 23a of the crank 23. Secondly, in this embodiment, optionally, the second end face 202 abuts against the end face of the driven wheel 22.

[0055] Please refer to Figures 4 to 6 In one embodiment, the eccentric wheel 221 has a third end face 203 away from the driven wheel 22, the third end face 203 is exposed in the mounting through hole, and is at least partially arranged opposite to the first protrusion 121. In this way, the first protrusion 121 also directly restricts the third end face 203 of the eccentric wheel 221, and because the third end face 203 and the first end face 201 use the same restriction reference (i.e., the first protrusion 121), the crank 23 and the eccentric wheel 221 are less likely to slip away from each other along the second direction. Of course, in other embodiments, the third end face 203 may be exposed in the mounting through hole, but not arranged opposite to the first protrusion 121.

[0056] Please refer to Figure 5 In one embodiment, the first end face 201 and the third end face 203 are arranged flush. In this way, the end face of the first convex portion 121 close to the first end face 201 can be arranged in a plane, which is beneficial to the processing and forming of the housing 10 and the yield rate. Of course, in other embodiments, the first end face 201 can be lower than the third end face 203, or the first end face 201 can be higher than the third end face 203.

[0057] In order to avoid the eccentric wheel 221 and the input end 23a of the crank 23 from thermally expanding during operation, which results in increased thermal expansion and jamming with the first protrusion 121, that is, the problem of thermal expansion jamming, in one embodiment, the first end face 201 and the first protrusion 121 are spaced apart in the second direction, and / or the third end face 203 and the first protrusion 121 are spaced apart in the second direction. That is, in the second direction, there is a gap between the first end face 201 and the first protrusion 121, and there is a gap between the third end face 203 and the first protrusion 121, for example, the gap can be set to 0.5mm to 1mm, so that the first protrusion 121 can effectively limit the eccentric wheel 221 and the input end 23a of the crank 23, and avoid the problem of thermal expansion jamming.

[0058] Please refer to Figure 5 In one embodiment, the driven wheel 22 has a fourth end face 204 and a fifth end face 205 opposite to each other, the eccentric wheel 221 is disposed on the fourth end face 204, and the limiting protrusion 12 includes a second protrusion 122, and the second protrusion 122 is disposed opposite to a portion of the fifth end face 205 in the second direction. In this way, the upper end of the driven wheel 22 is opposite to the first protrusion 121 through the third end face 203 of the eccentric wheel 221, and the lower end of the driven wheel 22 is opposite to the second protrusion 122 through the fifth end face 205, so that it can be effectively restricted by the housing 10 in the second direction, so that the driven wheel 22 can rotate smoothly and stably in the installation cavity 11.

[0059] In this embodiment, optionally, the fifth end surface 205 is provided with a positioning protrusion 222 corresponding to the second protrusion 122, and the positioning protrusion 222 is arranged opposite to the second protrusion 122. In this way, by adding the positioning protrusion 222 structure, the protruding height of the positioning protrusion 222 can be conveniently adjusted. For example, when the housing 10 is injection molded, the mold structure corresponding to the positioning protrusion 222 can be reprocessed so that the matching relationship between the positioning protrusion 222 and the second protrusion 122 meets the design requirements. Of course, in other embodiments, the positioning protrusion 222 may not be provided, and the fifth end surface 205 may be directly arranged opposite to the second protrusion 122.

[0060] In order to prevent the driven wheel 22 from thermally expanding during operation, which may cause the size to increase and interfere with the second protrusion 122, that is, the problem of thermal expansion jamming, in one embodiment, the positioning protrusion 222 is spaced from the second protrusion 122 in the second direction. For example, the gap may be set to 0.5 mm to 1 mm.

[0061] Please refer to Figures 4 to 6In one embodiment, the limiting protrusion 12 further includes a third protrusion 123, and the third protrusion 123 and the second protrusion 122 are arranged on the same side of the installation cavity 11, and the third protrusion 123 is arranged on the outer periphery of the second protrusion 122, and is arranged opposite to the outer edge of the fifth end face 205 in the second direction. That is, the second protrusion 122 is opposite to the central area of ​​the fifth end face 205, and the third protrusion 123 is opposite to the outer peripheral area of ​​the fifth end face 205. In this way, by adding the third protrusion 123, the limiting effect of the limiting protrusion 12 on the driven wheel 22 can be further improved, thereby improving the running smoothness and stability of the driven wheel 22 in the installation cavity 11. Of course, the third protrusion 123 may not be provided.

[0062] Please refer to Figure 5 In this embodiment, the third protrusion 123 and the fifth end surface 205 are optionally arranged in the second direction. In this way, the driven wheel 22 can be prevented from thermally expanding during operation, resulting in increased size and jamming and interference with the third protrusion 123. For example, the gap can be set to 0.5 mm to 1 mm.

[0063] It can be understood that when the gap between the third protrusion 123 and the fifth end face 205 in the second direction is approximately equal to the gap between the positioning protrusion 222 and the second protrusion 122 in the second direction, the fifth end face 205 is arranged in a plane. Since the positioning protrusion 222 is convexly arranged on the fifth end face 205, the protruding height of the second protrusion 122 will be lower than the protruding height of the third protrusion 123.

[0064] Please refer to Figures 4 to 6 In one embodiment, the eccentric wheel 221 has a third end face 203 away from the driven wheel 22, and the third end face 203 is exposed in the mounting through hole. The driven wheel 22 is provided with an axial hole 223, and one end of the axial hole 223 passes through the third end face 203. The first convex portion 121 is provided with a first plug hole 124 corresponding to the axial hole 223. The transmission assembly 20 also includes a pin shaft 24 passing through the axial hole 223, and the first end of the pin shaft 24 is inserted into the first plug hole 124. In this way, the structure is simple and easy to assemble. Of course, in other embodiments, the third end face 203 of the eccentric wheel 221 may be provided with a pin column, and the pin column can be inserted into the first plug hole 124; or, the first plug hole 124 is provided on the third end face 203 of the eccentric wheel 221, and the pin column is convexly provided on the first convex portion 121.

[0065] In this embodiment, optionally, the other end of the shaft hole 223 passes through the fifth end surface 205, the second convex portion 122 is provided with a second plug hole 125 corresponding to the shaft hole 223, and the second end of the pin 24 is inserted into the second plug hole 125. In this way, the structure is simple and easy to assemble. Of course, in other embodiments, the fifth end surface 205 of the driven wheel 22 may be provided with a pin, and the pin can be inserted into the second plug hole 125; or, the first plug hole 124 is provided on the fifth end surface 205 of the driven wheel 22, and the pin is convexly provided on the second convex portion 122.

[0066] Please refer to Figure 5 In one embodiment, the pin 24 is relatively fixedly arranged in the first plug hole 124 and the second plug hole 125, and there is a gap between the outer circumference of the pin 24 and the hole wall of the shaft hole 223. In this way, on the one hand, by fixing the pin 24 relative to the housing 10, the pin 24 can provide a more stable support and limiting effect for the eccentric wheel 221 and the crank 23 when the eccentric wheel 221 and the input end 23a of the crank 23 rotate, thereby improving the running smoothness and stability of the eccentric wheel and the crank 23. On the other hand, there is a gap between the outer circumference of the pin 24 and the hole wall of the shaft hole 223, which can prevent the driven wheel 22 from thermally expanding during operation, resulting in an increase in size due to thermal expansion and jamming and interference with the driven wheel 22.

[0067] In the present embodiment, the end face of the second end of the pin 24 is optionally abutted against the second plug hole 125, and the end face of the first end is spaced apart from the bottom wall of the first plug hole 124. It is understandable that if the two opposite ends of the pin 24 are respectively abutted against the bottom wall of the first plug hole 124 and the second plug hole 125, it is easy to cause the problem of difficult assembly or poor assembly due to problems such as dimensional tolerance and assembly tolerance. Therefore, a gap is provided between the first end of the pin 24 and the bottom wall of the first plug hole 124, which can avoid the above problems. Of course, in other embodiments, the end face of the first end of the pin 24 can also be abutted against the first plug hole 124, and the end face of the second end can be spaced apart from the bottom wall of the second plug hole 125.

[0068] In one embodiment, please refer to Figure 1 , Figure 4 and Figure 5 Optionally, the housing 10 includes a first housing portion 10a and a second housing portion 10b joined along the second direction, the mounting cavity 11 is formed at the joint of the first housing portion 10a and the second housing portion 10b, the second convex portion 122 and the third convex portion 123 are provided on the first housing portion 10a, and the first convex portion 121 is provided on the second housing portion 10b. In this way, the structure is simple and easy to assemble.

[0069] Please refer to Figure 2 , Figure 4 and Figure 6In one embodiment, the transmission assembly 20 further includes a driving wheel 21, which drives the rotating shaft provided on the driving member 101 and can drive the driven wheel 22 to rotate. Specifically, the driving wheel 21 is configured as a bevel gear, and the driven wheel 22 is configured as a face gear, and the bevel gear is meshed with the face gear; the face gear is provided on a side of the bevel gear close to the second plug hole 125, and the tooth surface of the face gear is provided toward the first plug hole 124.

[0070] Specifically, when installing the bevel gear and the face gear, first use the pin 24 to install the face gear on the first shell 10a, at this time, the positioning protrusion 222 of the face gear is arranged opposite to the second protrusion 122; then install the driving member 101 and the bevel gear thereon into the first shell 10a together, at this time, the bevel gear will automatically mesh and press on the tooth surface of the face gear; finally, the second shell 10b is spliced ​​on the first shell 10a, so that the various functional modules in the installation cavity 11 can be shielded and protected, and the first protrusion 121 can automatically align the first end face 201 and the third end face 203. In this way, the assembly process of the bevel gear and the face gear is simple and convenient, which is conducive to improving the production efficiency of the water flosser.

[0071] Please refer to Figure 2 , Figure 4 and Figure 6 In one embodiment, the crank 23 is disposed on the side of the face gear having the tooth surface. In this way, the crank 23 can be easily installed, which is beneficial to improving the production efficiency of the water flosser. Specifically, after the step of installing the face gear on the first shell 10a using the pin 24, the crank 23 is connected to the water pump 30 and installed into the first shell 10a. After the installation port 231 of the crank 23 is aligned with the eccentric wheel 221, it can be sleeved on the eccentric wheel 221 along the second direction. Of course, in other embodiments, the crank 23 can also be disposed on the side of the face gear away from the tooth surface.

[0072] Please refer to Figures 1 to 7 The utility model also proposes a water flosser, which includes the aforementioned transmission assembly 20. The specific structure of the transmission assembly 20 refers to the above-mentioned embodiment. Since the water flosser adopts all the technical solutions of all the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0073] Optionally, the oral irrigator further includes a mounting shell and a driving member 101, the mounting shell and the housing 10 of the transmission assembly 20 are configured as the same structure, the driving member 101 is arranged in the mounting cavity 11 of the mounting shell, and the driving wheel 21 of the transmission assembly 20 is arranged on the rotating shaft of the driving member 101. In this way, it is helpful to simplify the structure of the oral irrigator and facilitate its assembly and production. Of course, in other embodiments, the mounting shell and the housing 10 of the transmission assembly 20 can also be configured as different parts.

[0074] 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: A housing having a mounting cavity; A driven wheel, disposed in the mounting cavity and drivingly connected to the driving member of the dental flosser, an eccentric wheel convexly disposed on the end surface of the driven wheel; and A crank, wherein the crank has an input end and an output end opposite 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 rotation axis of the eccentric wheel extends along a second direction, and the second direction is arranged to intersect with the first direction; The inner wall surface of the installation cavity is provided with a limiting protrusion, and the edge of the installation opening and / or the eccentric wheel is at least partially arranged opposite to the limiting protrusion in the second direction to limit the displacement of the crank and the eccentric wheel in the second direction.

2. The transmission assembly according to claim 1, characterized in that: The input end has a first end face and a second end face opposite to each other, the mounting opening is configured as a mounting through hole penetrating the first end face and the second end face, the limiting protrusion includes a first protrusion, the first end face is away from the driven wheel and is at least partially arranged opposite to the first protrusion.

3. The transmission assembly according to claim 2, characterized in that: The eccentric wheel has a third end surface away from the driven wheel, the third end surface is exposed in the mounting through hole and is at least partially arranged opposite to the first protrusion.

4. The transmission assembly according to claim 3, characterized in that: The first end surface and the third end surface are arranged flush with each other.

5. The transmission assembly according to claim 3, characterized in that: The first end surface and the first convex portion are spaced apart in the second direction, and / or the third end surface and the first convex portion are spaced apart in the second direction.

6. The transmission assembly according to claim 1, characterized in that: The driven wheel has a fourth end face and a fifth end face opposite to each other, the eccentric wheel is arranged on the fourth end face, and the limiting protrusion includes a second protrusion, and the second protrusion is arranged opposite to a part of the fifth end face in the second direction.

7. The transmission assembly according to claim 6, characterized in that: The fifth end surface is provided with a positioning protrusion corresponding to the second protrusion, and the positioning protrusion is arranged opposite to the second protrusion.

8. The transmission assembly according to claim 7, characterized in that: The positioning protrusion and the second protrusion are spaced apart in the second direction.

9. The transmission assembly according to claim 7, characterized in that: The limiting protrusion also includes a third protrusion, which is arranged on the same side of the installation cavity as the second protrusion, and is arranged on the outer periphery of the second protrusion and opposite to the outer edge of the fifth end surface in the second direction.

10. The transmission assembly according to claim 9, characterized in that: The third protrusion and the fifth end surface are spaced apart in the second direction.

11. The transmission assembly according to claim 6, characterized in that: The input end has a first end face and a second end face relative to each other, the mounting opening is configured as a mounting through hole passing through the first end face and the second end face, the limiting protrusion includes a first protrusion, the first end face is away from the driven wheel and is at least partially arranged opposite to the first protrusion; the eccentric wheel has a third end face away from the driven wheel, the third end face is exposed in the mounting through hole, the driven wheel is provided with an axial hole, one end of the axial hole passes through the third end face, the first protrusion is provided with a first socket corresponding to the axial hole, and the transmission assembly also includes a pin shaft passing through the axial hole, and the first end of the pin shaft is inserted in the first socket.

12. The transmission assembly according to claim 11, characterized in that: The other end of the shaft hole passes through the fifth end surface, and the second protrusion is provided with a second insertion hole corresponding to the shaft hole, and the second end of the pin shaft is inserted into the second insertion hole.

13. The transmission assembly according to claim 12, characterized in that: The end surface of the second end of the pin shaft abuts against the second insertion hole, and the end surface of the first end is spaced apart from the bottom wall surface of the first insertion hole.

14. The transmission assembly according to claim 12, characterized in that: The transmission assembly also includes a driving wheel arranged on the rotating shaft of the driving member, the driving wheel is configured as a bevel gear, the driven wheel is configured as a face gear, the bevel gear is meshed and connected with the face gear; the face gear is arranged on a side of the bevel gear close to the second socket, and the tooth surface of the face gear is arranged toward the first socket.

15. The transmission assembly according to claim 14, characterized in that: The crank is arranged on a side of the face gear having a tooth surface.

16. The transmission assembly according to claim 12, characterized in that: The pin shaft is relatively fixedly arranged in the first insertion hole and the second insertion hole, and there is a gap between the outer peripheral surface of the pin shaft and the hole wall surface of the shaft hole.

17. The transmission assembly according to claim 1, characterized in that: The input end has a first end face and a second end face opposite to each other, the mounting opening is configured as a mounting blind hole penetrating the second end face, the limiting protrusion includes a first protrusion, the first end face is away from the driven wheel and is at least partially arranged opposite to the first protrusion, and the second end face abuts against the end face of the driven wheel.

18. A dental flosser, characterized in that: Comprising a transmission assembly as claimed in any one of claims 1 to 17.

19. The oral rinser according to claim 18, characterized in that: The oral irrigator further comprises a mounting shell and a driving member, wherein the mounting shell and the housing of the transmission assembly are configured as the same structure, the driving member is disposed in the mounting cavity of the mounting shell, and the driving wheel of the transmission assembly is disposed on the rotating shaft of the driving member.

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